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Quantum DPM5500 User's Guide

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1. Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 a Page Code 1Fh 1 Parameter Length 12h StorDT StorIE StorST StorMT4 2 Reserved Oh R aolo o 3 Reserved 0h MT gt DT MT gt IE MT ST MT gt MT 4 Reserved 0h 1 0 1 0 5 Reserved 0h e ST gt IE 0 ST gt ST 1 Pa 6 Reserved 0h TEDT 0 TE gt IE 0 EST 0 aa 7 Reserved 0h eae IDTIE 0 ae i k 8 11 Reserved 00000000h MTDT MToIE MTOST MTOMT 12 Reserved 0h 0 0 0 0 13 Reserved 0h a STooIE 0 ST ST 0 eas 14 Reserved 0h Ei IESIE 0 IE ST 0 Zi DT DT DT IE DTST DTOMT 15 Reserved 0h 0 0 0 0 16 19 Reserved 00000000h a DT Data Transfer Element Tape Drive b IE Import Export Element load port c ST Storage Element Bin d MT Medium Transport Element Gripper Mechanism The StorDT StorlE StorST and StorMT fields indicate if an element of the indicated type DT IE ST or MT is capable of storing a tape cartridge Quantum DX Series Software Interface Guide 47 Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah Table 36 Mode Sense Data Vendor Unique Page 20h 48 The XX gt YY fields indicate if a transfer from an element of type XX is possible to an element of type YY A 1 in any of these fields indicates that all Move Medium commands where the source element is type XX and destination element is type YY are supported A 0 in
2. Table 164 Disconnect Bit Byte 7 6 5 4 3 2 1 0 Reconnect Page Data Format 0 PS 0 Page Code 02h 1 Additional Page Length OEh 2 Buffer Full Ratio 0 3 Buffer Empty Ratio 0 MSB 4 5 Bus Inactivity Limit 0 LSB MSB 6 7 Disconnect Time Limit 0 LSB MSB 8 9 Connect Time Limit 0 LSB MSB 10 11 Maximum Burst Size LSB 12 Reserved DTDC 13 15 Reserved Quantum DX Series Software Interface Guide 213 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Table 165 Disconnect Field Name Description Reconnect Page Field Desenpiions PS Parameters Savable When 0 the supported parameters cannot be saved savable pages are not supported When set to 1 it indicates that the page can be saved in nonvolatile memory by the drive Additional This field indicates the number of bytes in the page Page Length Note that this value does not include bytes 0 and 1 The length is returned on MODE SENSE and must subsequently be set to the same value when performing MODE SELECT Buffer Full Not supported Ratio Buffer Not supported Empty Ratio Bus Not supported Inactivity Limit Disconnect Not supported Time Limit Connect Not supported Time Limit Maximum The value in this field specifies the maximum Burst Size amount of data to be transferred without disconnecting A value of 0 sets no limit This valu
3. Bit Byte 6 5 4 3 2 1 47 Media Loader Firmware Version 48 Media Loader Hardware Version 49 Media Loader Mechanical Version 50 Media Loader Present Flag 51 Library Present Flag 52 55 Module Revision Quantum DX Series Software Interface Guide Table 84 Vendor Unique Inquiry Data Page Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Field Name Description Product Family This field indicates the data density of each of the DLT tape drives as follows Bit Drive Density 0 Not Specified 1 2 6 GB 2 6 0 GB 3 10 0 20 0 GB 5 20 0 40 0 GB 6 15 0 30 0 GB 7 35 0 70 0 GB Tech Tip Only 35 0 70 0 GB is supported in the DX Series system Released Firmware This flag differentiates between released and test versions of firmware When set to 1 indicates released code Vxxx 0 indicates field test code Txxx Released code has no minor firmware version number byte 38 0 Field test and engineering versions of code have non zero minor firmware version numbers for tracking purposes Version These fields display the various version numbers in binary not ASCII Firmware Personality Firmware Subpersonality Numeric indicator of firmware personality For example firmware personality of 12 indicates DX Series system family Set to 69 indicating standard SCSI device firmware Loader Present Set to 0
4. the drive Bit Byte 7 6 5 4 3 2 1 0 0 Peripheral Qualifier Peripheral Device Type 1 RMB Device Type Modifier 2 ISO Version ECMA Version ANSI Version 3 AENC TrmIOP Reserved Response Data Format 4 Additional Length 33h 5 Reserved 6 Rsv d MChngr Reserved 0 7 RelAdr Wbus32 Wbus16 Sync 1 Linked Rsv d CmdQu SftRe 0 0 0 1 0 0 e 0 Vendor Identification 8 15 QUANTUM Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Bit Byte 7 6 5 4 3 2 1 0 Product Identification 16 31 DLT7000 Product Revision Level 32 35 hhss 35 55 Vendor Unique Bytes Table 82 contains field descriptions for the data returned by the drive Table 82 Standard Inquiry Data Page Field Descriptions Field Name Value Description Peripheral Qualifier 0 Non zero if initiator selects an invalid logical unit see below Peripheral Device Type 1 1 indicates that this is a sequential access device see below Note that the Peripheral Device Type entry for a medium changer is 8 RMB 1 Removable Medium Bit Set to 1 Device Type Modifier 0 Set to 0 to specify a sequential access device ISO Version 0 International Standardization Organization Version level Set to 0 ECMA Version 0 European Computer Manufacturers Organization Version level Set to 0 ANSI Version 2
5. Bit Byte 7 5 4 3 2 1 0 0 Operation Code A0h 1 Reserved 2 Select Report 3 5 Reserved MSB 6 9 Allocation Length LSB 10 Reserved 11 Control e Allocation Length If the Allocation Length is not sufficient to contain the logical unit number values for all configured logical units the device server still reports as many logical number values as will fit in the Allocation Length The format of the report of configured logical units is shown in Quantum DX Series Software Interface Guide 245 Chapter 3 Emulated DLT7000 SCSI Commands Report LUNS AOh Table 198 LUN Reporting Parameter List 246 Bit Byte 7 5 4 3 2 1 0 MSB 0 3 LUN List Length n 7 LSB 4 7 Reserved MSB 8 15 LUN first LUN LSB n 7 n LUN last LUN if more than one The LUN List Length field contains the length in bytes of the LUN list that can be transferred THe LUN list length equals the number of logical unit numbers reported multiplied by eight If the allocation length in the CDB is too small to allow transfer of information about all of the logical units configured the LUN list length value is not adjusted to reflect the truncation Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Request Sense 03h Request Sense 03h The REQUEST SENSE command causes the tape drive to transfer detailed sen
6. Table 118 Read Bit Byte 7 6 5 4 3 2 1 0 Write Compression Ratio LOG SENSE 0 Reserved Page Code 32h Header Format 1 Reserved MSB 2 3 Additional Length LSB 166 Quantum DX Series Software Interface Guide Table 119 Read Write Compression Ratio LOG SENSE Header Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Field Name Description Page Code The Page Code echoes the page code that was specified in the LOG SENSE command descriptor block Additional Length The Additional Length field specifies the number of bytes available and depends on the parameters requested Table 120 Log Parameters Format for Read Write Compression Ratio LOG SENSE Page Parameter Codes 00h and 01h Bit Byte 7 6 5 4 3 2 1 0 MSB 0 1 Parameter Code LSB 2 DU DS 1 Tsp 1 ETC TMC Rsv d LP 3 02h MSB 4 n Compression Ratio x 100 LSB Quantum DX Series Software Interface Guide 167 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Table 121 Log Parameters for Read Write Compression Ratio LOG SENSE Page Field Descriptions Parameter Codes 00h and 01h Field Name Description Page Code Parameter Codes supported for the READ WRITE COMPRESSION RATIO page are as follows for codes 00h and 01h only codes 02h through 09h are detailed separately
7. Table 42 Medium Bit Byte 7 6 5 4 3 2 1 0 Transport Element Descriptor 0 MSB Element Address 1 LSB 2 Reserved 00h Except wt Full 3 Reserved 00h 4 Additional Sense Code 5 Additional Sense Code Qualifier 6 7 Reserved 000000h 8 SValid Invert 9 Reserved 00h O ow 10 Source Storage Element Address 0000h 11 60 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Bit Byte 7 6 5 4 3 2 1 0 12 47 Primary Volume Tag Information Field omitted if PVolTag 0 48 51 Reserved 00000000h 52 Vendor Unique 0000h 53 Element Address This field indicates the address of the element being reported by that element descriptor Except e When the element is in a normal state it is set to 0 e When the element is in an abnormal state it is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields Full e The Full field is set to 1 whenever the element contains a tape cartridge e Itis set to 0 otherwise Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to one SValid Invert and Source Storage Element Address This field and the invert bit information value of 0 indicates these fields are not valid table 44
8. Number of Import Export Elements Field defines the total number of import export elements contained in the medium changer Tech Tip The DX Series does not support Number of Import Export Elements First Data Transport Element Address The First Data Transfer Element Address field specifies the first data transfer element contained in the medium changer Number of Data Transport Elements Field defines the total number of data transfer elements contained within the medium changer and accessible to the medium transport elements Table 29 Changeable oe z Parameters within Parameter Default Minimum Maximum MODE SELECT Alnit 00h 1 0 1 NBL 00h 0 0 1 AC 20h 0 0 1 Quantum DX Series Software Interface Guide 37 Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h Parameter Default Minimum Maximum DLR 20h 0 0 1 ADU 20h 1 0 1 38 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah Mode Sense 1Ah The SCSI Mode Sense command provides a general method for a host to obtain current parameter settings of a target device The host selects the set parameters to be returned by setting the Page Code field in the command block This code selects the page of parameter information to be returned by the target The DX Series system supports the three medium changer device parame
9. Bit Byte 7 6 5 4 3 2 1 0 4 MSB Number of Medium Transport Elements 0001h 5 LSB 6 MSB First Storage Element Address 7 LSB 8 MSB Number of Storage Elements 9 LSB 10 MSB First Import Export Element Address 11 LSB 12 MSB Number of Import Export Elements 13 LSB 14 MSB First Data Transport Element Address 15 LSB 16 MSB Number of Data Transport Elements 17 LSB 18 Reserved 0000h 19 PS Parameters Savable This bit is only used with the Mode Sense command see table 32 Reserved for Mode Select command and should be set to 0 First Medium Transport Element Address Field specifies the first medium transport element contained in the medium changer other than default medium transport address of 0 Number of Medium Transport Elements Field defines total number of medium transport elements contained in the medium changer Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h First Storage Element Address Field specifies the first storage element contained in the medium changer Number of Storage Elements Field defines total number of storage elements contained in the medium changer First Import Export Element Address Field specifies the first import export element contained in the medium changer Tech Tip The DX Series system does not support First Import Export Element Address
10. Buffer Offset Supported if Buffer ID is 2 The Buffer Offset field allows the host to specify where the start of the data is within the buffer Allocation This field specifies the maximum number of bytes that the initiator has Length allocated for returning data The host uses this field to limit the size of data transfers to its own internal buffer size The host should first send a READ BUFFER command in Descriptor mode to determine the size of the buffer being returned In response to the READ BUFFER command the tape system returns four bytes of data three of which contain the size of the buffer The host can then use this data to establish the Buffer Offset Allocation Length fields of the CDB Quantum DX Series Software Interface Guide 235 Chapter 3 Emulated DLT7000 SCSI Commands Read Buffer 8Ch Combined Header and Data Mode Table 185 READ BUFFER Header Data Format 236 Once the size of the buffer is known Mode 2 Data Only see Section 5 14 2 can be used to transfer the data across the SCSI Bus In this mode the tape drive returns a 4 byte header followed by data bytes The drive terminates the DATA IN phase when the Allocation Length bytes of header and data have been transferred or when all available data has been transferred to the initiator whichever is less The 4 byte READ BUFFER header is followed by data bytes from the target data buffer The figure below illustrates the format of t
11. cccceeen 190 Device Configuration Page Field Descriptions 192 Medium Partition Page Format Descriptor Data Format 195 Medium Partition Page Descriptor Field Descriptions 195 TapeAlert Page Format Descriptor Data Format 196 TapeAlert Page Format Descriptor Field Descriptions 197 Changeable Parameters within MODE SELECT 200 MODE SENSE 6 Command Descriptor Block Data Format a nosimi a tiation ailany 202 MODE SENSE 10 Command Descriptor Block Data POrmate 2 ss nccssntn esate E E REES 203 MODE SENSE Control Descriptor Block Field Descriptions esses nere epr oar vote a a E 203 MODE SENSE 6 Data Header Data Format 00 204 MODE SENSE 10 Data Header Data Format 205 MODE SENSE Data Header Field Descriptions 205 MODE SENSE Block Descriptor Data Format 206 MODE SENSE Block Descriptor Field Descriptions 207 MODE SENSE Page Descriptor Data Format 0 209 MODE SENSE Page Descriptor Field Descriptions 210 Read Write Error Recovery Page Data Format 211 Read Write Error Recovery Page Field Descriptions 212 Disconnect Reconnect Page Data Format 213 Disconnect Reconnect Page Field Descriptions 214 Control Mode Page Data Format eeeceeseseseneneeeees 215 Control Mode Page Field Descriptions 216 Data Compressio
12. 0 0 DX Series Unit Inventory cccececccssseescesesesssecesseesesseensees OM LIMe 45 cites awash an aaa eas Typical Application Enhancement ccccseeceseseee eee Emulated Medium Changer SCSI Commands Supported Operational Commands 20 0 eeeeesseeeeereteeeneeeeeeneees Quantum DX Series Software Interface Guide xxi Chapter 3 Initialize Element Status 07h occ es cseeeseececeeseseecenseaeseeceseeenaneses 13 Initialize Element Status with Range E7h 00 eee eee ee ceeeeeee tetera 14 TG ad y VAN vssies cscscsseescvnscctsns aer aerae i E A EE A E 16 Inquiry Command Data Format ss sssessesessesseerierisrrsresierierrsrsnsesrereesns 16 Standard Inquiry Data Format ss ssssssesississssresiesresrssresresresresnrsreseeene 17 Supported Vital Product Data Page ses essssissssserieriesesrresrerresresresresees 20 Log Sense ADH vesscccerscivccecsescavssssues csvvsstonsteneesneoavvuvsnesvavietensnvevversaysvenvsaseevbaetsdy 26 Mode Select 15i sscsizsscssessccssctuvessseccsasnassanstdaurszecssedentpacatinuronessieiesezessi ansbeaenacie 32 Mode Sense LAN sii tschscssc cstuchssensstpeneesethtigunas RER E 39 Move Medium ASI scscsseacsscics sasssesticnvessexsteestphecsvausasacseubstenscvvbasvneaciauiveatitin 50 Position To Element 2B csissssscssscvessecsessesssecvacteasnnsvesessarssvessedarvetensovvevatens ses 52 Read Element Status BEN wo cee ceeseeseseesecseeeceeeeseseseeanecaeseeeser
13. Quantum DX Series Software Interface Guide 173 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 126 MODE SELECT 6 10 Command Descriptor Block Field Descriptions Mode Parameter List Table 127 MODE SELECT 6 Mode Parameter List Data Format Table 128 MODE SELECT 10 Mode Parameter List Data Format 174 Field Name Description PF Page Format The Page Format bit indicates that the data sent by the host after the MODE SELECT header and block descriptors complies with the definition of pages in the SCSI 2 specification The SCSI 1 format will not be implemented so this bit must be set to 1 It is an ILLEGAL REQUEST to have page parameters while the PF bit is 0 SP Save Parameters Must be 0 If set this bit instructs the drive to save all savable pages and this is not supported on the tape drive The figure shows the format of the Mode Parameter List that is passed by the initiator to the tape drive during the command s DATA OUT phase Bit Byte 7 6 5 4 3 2 1 0 0 3 Mode Parameter Header 4 11 Mode Parameter Block Descriptor Optional 4 11 or Page s Optional 12 n Bit Byte 7 6 5 4 3 2 1 0 0 7 Mode Parameter Header 8 15 Mode Parameter Block Descriptor Optional 8 n or Page s Optional 16 n Quantum DX Series Software Interface Guide Table 129 MODE SELECT Mode Parameter
14. DBR Data Buffer Recovery Not supported must be 0 BIS Block Identifiers Supported This field is supported Set to 1 RSmk Report Setmark Not supported must be 0 AVC Automatic Velocity Control Not supported must be 0 SOCF Stop on Consecutive Filemarks Not supported must be 0 RBO Recover Buffer Order Not supported must be 0 REW Report Early Warning Not supported must be 0 do not report Early Warning EOM on READ Gap Size Not used must be 0 EOD End of Data Defined This field must be set to 00h Defined Quantum DX Series Software Interface Guide 193 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name EEG Description Enable End of Data Generation Set to 1 This field indicates that the drive will generate an EOD The drive generates an EOD mark before any change of direction following a WRITE type operation This bit is ignored however on MODE SELECT SEW Synchronize at Early Warning Must be set to 1 Buffer Size at Early Warning Not supported must be 0 SEW Synchronize at Early Warning Must be set to 1 Select Data Compression Algorithm When set to 1 enables data compression When 0 data compression is disabled Tech Tip Cell parameter values and flags are accepted but not acted on Medium Partition The drive supports the Medium Partitions Parameters Page that is used Page 11h to specify the medium
15. Max Vol Sequence Number Sequence numbers are not supported This must be set to 0 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Test Unit Ready 00h Test Unit Ready 00h Table 69 Test Unit Ready Command The host uses the Test Unit Ready command to determine if a DX Series system is ready The DX Series system responds in one of these ways depending upon the state of the DX Series system Returns a Good Status whenever the DX Series system is ready to accept a medium access command without returning a check condition status it returns this status in response to a Test Unit Ready command Returns a check condition status when the DX Series system receives a Test Unit Ready command but is not ready to accept a medium access command it sets the Additional Sense fields and returns this status The meaning of the values in the Additional Sense fields are described along with the Request Sense command The format for the Test Unit Ready command Descriptor Block is shown in table 69 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 00h 1 Logical Unit Number Reserved 00h 2 3 Reserved 000000h 4 5 Reserved 00h Logical Unit Number The Logical Unit Number must be set to 0 This field indicates the logical unit to which the message is sent Quantum DX Series Software Interface Guide 105 Chapter 2 Emulated Medium
16. NO ADDITIONAL SENSE INFORMATION No recovery necessary 04 00 LU IS NOT READY CAUSE NOT REPORTABLE Check DX Series system unit power Retry command 04 01 LOGICAL UNIT IN PROCESS OF BECOMING READY Wait for DX Series system unit to complete initialization 04 02 LOGICAL UNIT INIT REQUIRED Element status or calibration unknown Perform Initialize Element Status command SCSI or Initialize Inventory command DIAG 04 03 LU IS NOT READY MANUAL INTERVENTION REQ D Initialization failed Determine failure type by checking any previous error code returned to host Correct the cause of the failure and toggle STANDBY button 08 00 LOGICAL UNIT COMMUNICATION FAILURE Check cables Ensure DX Series system unit is turned on Retry command 08 01 DX Series system COMMUNICATION TIME OUT ER_LU_COM_TO QSPI communications not responding Retry command 1A 00 PARAMETER LIST LENGTH ERROR Invalid parameter list length field specified by command 282 Quantum DX Series Software Interface Guide ASC 20 ASCQ 00 Appendix B Media Changer Sense Code Values Message Name Description INVALID COMMAND OPERATION CODE Verify the host command format 21 01 INVALID ELEMENT ADDRESS Check Mode Sense data for correct element addresses 24 00 INVALID FIELD IN COMMAND DATA BLOCK Ensure all reserve fields are set to
17. Request Sense 03h Table 201 REQUEST SENSE Data Format 248 drive The tape drive returns information based on the non diagnostic data in its buffer as well as the data on tape medium Additionally bytes 25 through 28 contain the amount of tape to be written in 4 KB blocks REQUEST SENSE does not cause the drive to flush its buffered data to tape Therefore if the host requires the exact physical positioning of the tape medium it should precede the REQUEST SENSE command with a WRITE FILEMARKS command with length 0 Immed 0 specified This forces the tape drive to flush any currently buffered data to tape A subsequent REQUEST SENSE command returns the actual physical and logical position of the tape drive to the initiator The following illustration portrays the format of REQUEST SENSE DATA Bit Byte 7 6 5 4 3 2 1 0 0 Valid Error Code 1 Segment Number 0 2 Filemar FOM ILI Reserve Sense Key k d MSB 3 6 Information Bytes LSB 7 Additional Sense Length MSB 8 11 Command Specific Information Bytes LSB 12 Additional Sense Code ASC 13 Additional Sense Code Qualifier ASCQ 14 Sub Assembly Code 0 15 SKSV C D Reserved BPV Bit Counter Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Request Sense 03h Bit Byte 7 6 5 4 3
18. The format of the Rezero Unit command is shown in table 64 Table 64 Rezero Unit Bit Byte 7 6 5 4 3 2 1 0 Command 0 Operation Code 01h 1 Logical Unit Number Reserved 00h 2 3 Reserved 000000h 4 5 Reserved 00h Logical Unit Number The Logical Unit Number is 0 This field indicates the logical unit to which the command is sent Quantum DX Series Software Interface Guide 99 Chapter 2 Emulated Medium Changer SCSI Commands Send Diagnostic 1Dh Send Diagnostic 1 Dh Table 65 Send Diagnostic Command 100 The DX Series system includes a built in self test This test is automatically performed when the DX Series system is turned on It can also be performed by issuing the Send Diagnostic command to the DX Series system e If the self test passes a Good status is returned e Ifthe self test fails a check condition status is returned and the sense key is set to Hardware Error The Additional Sense fields identify the type of failure The description of the Request Sense command tells how to get the Sense data from the DX Series system and how to interpret the Sense data fields The format of the Send Diagnostic command is shown in table 65 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code h 1 Logical Unit Number PF 1 Reserved cai Test Dev OfL peg 0 OfL 2 Reserved 00h 3 MSB Parameter List Le
19. Description HARDWARE ERROR The Additional Sense Code Additional Sense Code Qualifier fields may present more specific information 5h ILLEGAL REQUEST The Command Descriptor Block or supplied parameter data had an unsupported or illegal operation specified Check bytes 15 16 and 17 6h UNIT ATTENTION Unit Attentions are created after a device reset if the medium asynchronously becomes ready to the initiator if another initiator changes Mode Parameters and or if the firmware is updated DATA PROTECTED The current tape medium is write protected This can be because the Write Protect switch on the cartridge is in its enabled position or if the tape medium is not the appropriate type DLTtape I or DLTtape II or if a software write protect is issued 8h BLANK CHECK An End of Data or LongGap has been encountered Bh COMMAND ABORTED This key is generated when a command has been aborted by the tape drive for some reason Check the Additional Sense Code Additional Sense Code Qualifier bytes Dh VOLUME OVERFLOW This key indicates that the physical end of tape medium has been reached during writing The initiator ignored the End of Medium condition and continued to write to tape Eh MISCOMPARE A compare error has occurred during READ by the self tests invoked during execution of aSEND DIAGNOSTIC command Quantum DX Series Software Interface Guide 253 Chapter 3 Emulated
20. LogErr Error Log Not supported 198 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description MRIE Method for Reporting Informational Exceptions The tape drive uses the contents of this field to report information about exception conditions Three methods are available Value Method 00h No reporting of Informational Exception Conditions The device server does not report information exception conditions 03h Conditionally Generate Recovered Error The device server reports informational exception conditions if such reports of recovered errors is allowed by returning CHECK CONDITION status on the next SCSI command except INQUIRY and REQUEST SENSE commands following detection of the condition The Sense Key is set to RECOVERED ERROR with an additional sense code of 5D 00 TapeAlert Event The SCSI command with CHECK CONDITION completes without error prior to the report of any exception condition and does not need to be repeated 06h Only Report Informational Exception Condition on Request The device server preserves information exception data To access the data a poll can be taken by issuing an unsolicited REQUEST SENSE command The Sense Key is set to NO SENSE with an additional sense code of 5D 00 TapeAlert Event The additional sense code of 5D 00 for values 03h and 06h signals that a TapeAlert event has occu
21. 0 Block This field specifies the length in bytes of all of the Descriptor block descriptors Since the drive only supports one Length block descriptor this value is 08h MODE SENSE The following figure describes the MODE SENSE block descriptor that Block Descriptor follows the MODE SENSE header Descriptions of the MODE SENSE blocks are provided in Table 5 51 Table 158 MODE Bit Byte 7 6 5 4 3 2 1 0 SENSE Block Descriptor Data 0 Density Code Format 206 Quantum DX Series Software Interface Guide Table 159 MODE SENSE Block Descriptor Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Bit Byte 7 6 5 4 3 2 1 0 MSB 1 3 Number of Blocks 000000h LSB 4 Reserved MSB 5 7 Block Length LSB Field Name Description Density The contents of this field match the density of the Code media or 0 if the density is unknown Density Description cede Use default density oe 6667 bpi MEM serial cartridge tape X3B5 86 199 OAh read only 16h 10000 bpi MFM serial cartridge tape X3 193 1990 17h read only 18h 42500 bpi MFM serial cartridge tape X3B5 91 2 6 GB DLTtape III only a Same as 17h but with 56 track pairs vs 24 6 0 GB 1Ah DLTtape III only 1Bh 62500 bpi 64 track pairs serial cartridge tape 10 0 GB DLTtape III only 15 0 GB DLTtape IIxt only 81633 bpi 64
22. 0 9 Reserved 00h Logical Unit Number The Logical Unit Number must be set to 0 This field indicates the logical unit to which the command is sent Transport Element Address The default medium transport element address of 0 or the medium transport element address specified by the mode sense data can be used Destination Element Address The destination address specifies the location to which the medium transport element is moved Invert The medium changer does not support medium rotation for handling double sided media The invert bit must be set to 0 Quantum DX Series Software Interface Guide 53 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Read Element Status B8h The host can determine the status of any DX Series system element by issuing a Read Element Status command The command can specify the element type Medium Transfer Storage Import Export Tech Tip The DX Series system does not support import export Data Transfer Starting Address Number of elements for which status information is to be returned The DX Series system automatically updates its internal element status every time the status changes The DX Series system inventory initializes the information and it is updated with each move Because the information is updated with each move no action is required by the DX Series system other than returning the information it has stored
23. 1Ah 5Ah Field Name Description 06h Only Report Informational Exception Condition on Request The device server preserves information exception data To access the data a poll can be taken by issuing an unsolicited REQUEST SENSE command The Sense Key is set to NO SENSE with an additional sense code of 5D 00 TapeAlert Event The additional sense code of 5D 00 for values 03h and 06h signals that a TapeAlert has occurred Information about the event is stored in the TapeAlert Log Page The setting of MRIE does not impact logging of events in the TapeAlert Log Page Interval Not Supported Timer Report Not Supported Count Test Flag Number EEPROM Vendor Unique Page 3Eh EEPROM Vendor Unique Page 3Eh is not supported 226 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Prevent Allow Medium Removal 1Eh Prevent Allow Medium Removal 1Eh This command enables or disables the unloading of the tape cartridge ian Bit Byte 7 6 5 4 3 2 1 0 aie a ie tl 0 Operation Code 1Eh Data Format 1 Logical Unit Number Reserved 2 3 Reserved 4 Reserved Prevent 5 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide 227 Chapter 3 Emulated DLT7000 SCSI Commands Prevent Allow Medium Removal 1Eh Table 177 PREVENT ALLOW MEDIUM REMOVAL Command Descriptor Block Field Descript
24. 3 Alternating 0000000000 4 nants FF FF FF FF FF 5 Marching 1 555A AA A555 6 Marching 0 5A AA A5 7 MW 01 02 03 04 08 10 MEM 20 40 80 IF FE FD FB F7 EF 9 default DF BF 7F ci OE OE OE OE 0E 0E gg OE 0E DE AD DE AD DE AD DE AD AA AA AA AA AA AA AA AA Maximum This field specifies the number of test passes of the Number of diagnostic to be run If Maximum Number of Test Test Passes Passes 0 the test will loop continuously A BUS RESET or a selection from the host sending an ABORT or BUS DEVICE RESET message terminates testing Default 1 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1Dh Field Name Description Block Size This field specifies the size of the blocks to be used If this field is 0 random block sizes are used Default 8400 bytes DLTtape III media 64 K DLTtape IV media Block Count This field specifies how many blocks to WRITE READ to and from starting on track 0 then moving to track 1 Default 500 For example if the Block Size and Block Count fields result in three 3 tracks worth of data the test will Write tracks 0 1 2 REWIND READ and VERIFY tracks 0 1 2 WRITE three tracks starting with 1 1 2 3 and then REWIND to the beginning of track 1 and perform the READ and VERIFY pass If Block Count is 0 data is written until EOT is reached each time so almost four 4 complete passes over the tape would resul
25. Block Data Format Table 225 WRITE FILEMARKS Command Data Field Descriptions The WRITE FILEMARKS command directs the tape drive to write the specified number of Filemarks beginning at the current logical position on tape If the Immediate bit is not set any data or Filemarks in the WRITE cache buffer are written to tape Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 10h Logical Unit Number Reserved WSMk Immed 0 MSB 2 4 Number of Filemarks LSB 5 Unused Reserved Flag 0 Link 0 Field Name Description WSmk Write Setmark Must be 0 This tape drive does not support Setmarks Quantum DX Series Software Interface Guide 277 Chapter 3 Emulated DLT7000 SCSI Commands Write Filemarks 10h 278 Field Name Description Immed Immediate When this bit is set to 1 the tape drive returns status as soon as the Command Descriptor Block CDB has been validated unless the Filemark count is 0 or greater than 1 since either condition causes the WRITE buffer to be flushed to tape medium When set to 0 this bit indicates the status will not be returned until the operation is complete Tech Tip The immed bit is accepted but ignored in processing Number of This field contains the number of consecutive Filemarks Filemarks to be written to tape medium A value of 0 is not considered to be an error GOOD status is returned The WRIT
26. The format for the Read Element Status command block is shown in table 39 Table 39 Read Bit Byte 7 6 5 4 3 2 1 0 Element Status Command 0 Operation Code B8h 1 Logical Unit Number VolTag Element Type Code 2 MSB Starting Element Address 3 LSB 4 MSB Number of Elements 5 LSB 54 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Bit Byte 7 6 5 4 3 2 1 0 6 Reserved 00h 7 MSB 8 Allocation Length 9 LSB 10 Reserved 00h 11 Reserved 00h Logical Unit Number The Logical Unit Number is 0 VolTag The Volume Tag field VolTag indicates whether the volume tag information associated with each tape cartridge should be returned as part of the status information The volume tag or bar code is updated for each tape cartridge whenever it is moved with a Move Medium command The volume tag information for all tape cartridges can also be updated using the Initialize Element Status command see Initialize Element Status 07h on page 13 Since tape cartridges are a single sided media only a single volume tag is supported per tape cartridge Element Type Code This field indicates which element type is reported 0 indicates all element types reported 1 indicates medium transport element 2 indicates storage element 3 indicates impo
27. The inventory indicated that a cartridge was in this bin but no cartridge was sensed by the gripper when it attempted to pick it Retry the command Check for proper seating of the cartridge It may also indicate that the tape is not ready to be picked from the drive because the tape is not fully unloaded Retry the command If the problem persists check the function of the tape drive handle assembly Manually unload the tape 3B 0D MEDIUM DESTINATION ELEMENT FULL Destination element address already contains a cartridge Issue a Read Element Status command and retry move command If the problem recurs issue an Initialize Element Status command followed by a Read Element Status command and retry move command 284 Quantum DX Series Software Interface Guide ASC 3B ASCQ OE Appendix B Media Changer Sense Code Values Message Name Description MEDIUM SOURCE ELEMENT EMPTY Source element address does not contain a cartridge Issue a Read Element Status command and retry move command If the problem recurs issue an Initialize Element Status command followed by a Read Element Status command and retry the move command 3F OE REPORTED LUNS DATA HAS CHANGED 45 00 SELECT OR RE SELECT FAILURE DX Series system timed out trying to reselect host Make sure host is running 47 00 SCSI PARITY ERROR SCSI Parity Error detected Check cable connections and cable length 48 00
28. command s TapeAlert Page Quantum DX Series Software Interface Guide 223 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Table 174 TapeAlert Page Format Descriptor Data Format Table 175 TapeAlert Page Format Descriptor Field Descriptions 224 Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 0 Page Code 1Ch 1 Additional Page Length 0A 2 Perf Reserved DExcpt Test Rsvd LogErr 3 Reserved MRIE MSB 4 7 Interval Timer LSB MSB 8 11 Report Count Test Flag Number LSB Field Name Description PS Parameters Savable For MODE SELECT this bit must be 0 Additional This field indicates the number bytes in the page Page Length However the value does not include bytes 0 and 1 The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT If the page length does not match that expected by the drive a CHECK CONDITION status is returned sense key set to ILLEGAL REQUEST The drive returns a CHECK CONDITION status with sense key set to ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field with values not supported or changeable In such cases no parameters are changed as a result of the command Quantum DX Series Software Interface Guide Field Name Perf Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Description Performance
29. maximum value is 6500 1964h This represents a range in delay from 1 5 seconds to 11 minutes Tech Tip Accepted but not acted on DBR Data Buffer Recovery Not supported must be 0 BIS Block Identifiers Supported Set to 1 RSmk Report Setmarks Not supported must be 0 AVC Automatic Velocity Control Not supported must be 0 SOCF Stop on Consecutive Filemarks Set to 0 RBO Recover Buffer Order Set to 0 REW Report Early Warning Set to 0 do not report early warning EOM on reads Gap Size Not supported Set to 0 EOD End of Data Set to 00h Defined EEG Enable EOD Generation Bit Set to 1 to indicate that the drive generates an EOD The drive generates an EOD mark before any change of direction following a WRITE type operation SEW Synchronize at Early Warning Set to 1 Quantum DX Series Software Interface Guide 221 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name Description Buffer Size at Not supported must be 0 Early Warning Select Data If set to 1 data compression is enabled If 0 data Compression compression is disabled Algorithm Medium Partition Page 11h The tape drive supports the Medium Partition Page The format for the page is illustrated in the following figure Table 172 Medium Bit Byte 7 6 5 4 3 2 1 0 Partition Page Data Format 0 PS 0 0 Page Code 11h 1 Additional
30. requests the target to return the changeable parameter mask for the page code specified the page indicates which parameters are changeable e 2 requests the target return the default values for the page code specified e 3 requests the target return saved values for the page code specified only the Vendor Unique Page has changeable savable parameters 40 Quantum DX Series Software Interface Guide Table 31 Mode Sense Data Header Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah e Otherwise the current setting for each parameter is always the same as the setting that parameter had when the DX Series system was turned on e Page Codes The valid page codes are 00h Vendor Unique Page length 44h 1Dh Element Address Assignment Page length 18h 1Eh Transport Geometry Parameters Page length 08h e 1Fh Device Capabilities Page length 18h 20h Vendor Unique Page length 08h e 3Fh Return All Pages length 74h The parameter data returned for each Mode Sense command is preceded by a Mode Parameter header block The header block is then followed by either the requested parameter page or all pages if the Return All Pages page code was used The format for the Mode Sense header block is shown in table 31 Bit Byte 6 5 4 3 2 1 0 0 Mode Sense Data Length 1 Medium Type 00h 2 Device Specific Parameter 00h 3 Block Descr
31. z ie v Pe Glossary medium changer element A member of the tape DX Series address space Each element is a discrete physical entity that can hold a single tape cartridge medium transport element Mechanism used to move media between elements within the DX Series message parity error This SCSI 2 message is sent to the DX Series to indicate that it received a message byte with a parity error message reject This SCSI 2 message is sent to indicate that the last message or message byte it received was inappropriate or has not been implemented mode sense command Provides a method for a host to obtain parameter setting of a target device move medium command Moves a tape cartridge from one element to another within a DX Series NVRAM Nonvolatile RAM no operation message This SCSI 2 message is sent in response to a DX Series s request for a message when the host does not currently have any other valid message to send on line Ready for communications with a host position to element command Allows the application to move the robotics to a more advantageous position while the tape drives are busy prevent allow medium removal command Requests target to disable or enable medium removal by preventing the user from opening load port or load pack doors read element status command Determines status of any DX Series element including element type starting address and number of elements for which status informa
32. 20 0 GB Mode 0 0 FFFFFEh 35 0 GB and 70 GB Mode 0 0 FFFFFEh READ WRITE Error Recovery 0 0 1 01h PER bit Control Mode OAh RLEC 0 0 1 Disconnect Reconnect 02h 0080h 0000h FFFFh Maximum Burst Size Disconnect Reconnect 02h DTDC 0 0 3 Device Configuration 10h WRITE C8h Fh 1964h Delay Time Device Configuration 10h SEW 1 0 1 Device Configuration 10h Select 1 0 1 Data Compression Algorithm Data Compression OFh DCE 0 0 1 TapeAlert 1Ch Perf 0 0 1 TapeAlert 1Ch DExcpt 1 0 1 TapeAlert 1Ch Test 0 0 1 TapeAlert 1Ch MRIE 3 0 6 Quantum DX Series Software Interface Guide 201 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Mode Sense 6 10 1Ah 5Ah The MODE SENSE command allows the drive to report its media type and current or changeable configuration parameters to the host It is a complementary command to MODE SELECT Tech Tip The specific page information is accepted and retained but not acted on during processing The EEPROM vendor unique page will always return VENDORID QUANTUM PRODUCTID DLT7000 The command descriptor block for the 6 byte MODE SENSE 1Ah is shown below An illustration of the command descriptor block for the 10 byte MODE SENSE 5Ah follows on the next page Table 152 MODE Bit Byte 7 6 5 4 3 2 1 0 SENSE 6 Command Descriptor Block 0 Operation Code 1
33. 4 5 Reserved MSB 6 7 Block Descriptor Length 08h LSB Field Name Description Mode Sense This field specifies the length in bytes of the Data Length MODE SENSE data that is available to be transferred during the DATA IN phase Note that the Mode Sense Data Length does not include itself Media Type The media type is determined by the drive and can be one of the following Media Type Description 00h Unknown or not present 81h Cleaning tape 82h DLTtape I or DLTtape II 83h DLTtape II 84h DLTtape HIxt 85h DLTtape IV WP Write Protect If 0 this field indicates that the tape is write enabled If set to 1 it indicates that the tape is write protected Quantum DX Series Software Interface Guide 205 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name_ Description Buffered This mode implements Immediate Reporting on Mode WRITE commands via the Buffered Mode If the field is 0 then the drive does not report a GOOD status on WRITE commands until the data blocks are actually written to tape If the field is 1 then the drive reports GOOD status on WRITE commands as soon as the data block has been transferred to the buffer This is the default configuration of the drive Note that if Buffered Mode is not used the tape drive will suffer a degradation in performance but not in capacity Speed The tape drive supports only one speed This is the default speed
34. 6 are returned to the initiator If the Parameter Pointer is larger than the highest numbered parameter on the page then the target terminates the command with CHECK CONDITION status sense key set to ILLEGAL REQUEST and additional sense code set to INVALID FIELD IN CDB Note that parameters within a page are always returned in ascending order according to parameter code If the target does not support a parameter code within this page then it does not return any data associated with this parameter Allocation Length The Allocation Length field is used to inform the target how much space the initiator has allocated for data The host uses this field to limit the size of data transfers to its own internal buffer size Error Detection Summary in LOG SENSE Command Descriptor Block The following conditions constitute errors detected by the drive relating to the LOG SENSE command descriptor block The request sense data is set to ILLEGAL REQUEST INVALID FIELD IN CDB Error conditions occur when e lt A page is not supported e The parameter pointer is larger than the highest numbered parameter on the page e The SP bit is set to 1 e The Allocation Length is smaller than the data being returned by the target e PPC bit set to 1 Quantum DX Series Software Interface Guide 161 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Supported Pages Log Page Page 00h Table 112 Supported Pages Page Da
35. ANSI SCSI Level 2 SCSI 2 is supported AENC 0 Asynchronous Event Notification is not supported TrmlOp 0 Terminate I O Process The tape drive does not support the TERMINATE I O PROCESS message Quantum DX Series Software Interface Guide 127 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Field Name Value Description Response Data Format 2 This Standard Inquiry Data is in SCSI 2 format Additional Length 33h Tape drive uses this field to indicate the number of additional bytes of INQUIRY Response Data available Mchnger 0 Set to 1 if a Media Changer Loader is present and EEPROM parameter EnbIngMedCher is set to 1 This SCSI 3 bit indicates that the Read Element Status and Move Medium commands can be issued to the drive LUNO By default this bit is set to 0 on the DLT7000 RelAdr 0 Relative Addressing is not supported WBus 32 0 Set to 0 since the drive does not support 32 bit transfer WBus 16 0 The WBus bit is 0 since the drive supports 16 bit data transfer Sync 0 The drive supports Synchronous Data Transfers Linked 0 Linked Commands are supported CmdQue 0 The drive does not support Tagged Command Queuing SftRe 0 The drive implements the hard reset option in response to assertion of the SCSI Bus reset line Vendor Identification The value in this field is QUANTUM there is one space after the word Quantum Product Identification The value in this f
36. BUFFER Command Descriptor Block Field Des riptiohg seiss hise isii iin nii ii nai isa 235 READ BUFFER Header Data Format sseeseseseeseeeesereereee 236 READ BUFFER Header Field Descriptions 0 0 0 237 READ BUFFER Descriptor Data Format 237 READ POSITION Command Descriptor Block Data Formation secere e Eee eE EEEE 238 READ POSITION Command Descriptor Block Field Descriptionss tsss eeter oa aa a Eas 238 READ POSITION Data Format sssssseeesiesssesieerseerreseresees 239 READ POSITION Data Field Descriptions 240 RECEIVE DIAGNOSTIC RESULTS Command Descriptor Block Data Formati 2cs tcsssvessecssssensenctovbvssbatssvsanteqeteessaanats 241 Quantum DX Series Software Interface Guide Table 193 Table 194 Table 195 Table 196 Table 197 Table 198 Table 199 Table 200 Table 201 Table 202 Table 203 Table 204 Table 205 Table 206 Table 207 Table 208 Table 209 Table 210 Table 211 Table 212 Table 213 Table 214 Table 215 Table 216 Tables RECEIVE DIAGNOSTIC RESULTS Command Data Field Descriptions i 20 iiss tsess e eeir ee a 241 RECEIVE DIAGNOSTIC RESULTS Data Format 242 RELEASE UNIT Command Descriptor Block Data Formatas sfc isediti sine u e EE E E E tunes 243 RELEASE UNIT Command Data Field Descriptions 243 Report Luns Command occ sesesseececeeeeseesesensesesesaeeeees 245 LUN Reporting Parameter List ccccceeeeesseeeeeeeeeees 2
37. Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Table 98 Subsystem Components Revision Page Field Descriptions Field Name Product Family Bit N DBD OF WO NY FR O Released Firmware Description This field indicates the data density of each of the DLT tape drives as follows Drive Density Not Specified 2 6 GB 6 0 GB 10 0 20 0 GB 20 0 40 0 GB 15 0 30 0 GB 35 0 70 0 GB Tech Tip Only 35 0 70 0 GB is supported in the DX Series system This flag differentiates between released and test versions of firmware When set to 1 indicates released code Vxxx 0 indicates field test code Txxx Released code has no minor firmware version number byte 38 0 Field test and engineering versions of code have non zero minor firmware version numbers for tracking purposes Version These fields display the various version numbers in binary not ASCII Vendor Unique Subtype Identification of product Firmware Personality Numeric indicator of firmware personality For example firmware personality of 4 indicates OEM family 15 indicates OML family and 18 indicates OMX family Firmware Subpersonality Set to 1 indicating standard SCSI device firmware 140 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Field Name Description Loader Present Set to 0 indicates no loader present Non zero indicates loader is pres
38. Cleaning Cartridge Installed ASC 30 ASCQ 03 e Any tape drive error ASC 8D or ASC F3 Not Bus This field is sent as 0 The data transfer element is on the same bus as the media changer device ID Valid When set to 1 it indicates that the SCSI BUS address field contains valid information LU Valid When set to 1 it indicates that the Logical Unit Number field contains valid information SCSI Bus Address If valid it provides the SCSI address of the primary device served by the media changer at this element address Quantum DX Series Software Interface Guide Table 47 Alternate Volume Tag Information Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h SValid e The SValid bit is set to 1 if information in the Source Storage Element Address field is valid e If information is unknown due to a door open or power on condition the SValid bit is set to 0 Invert The invert field is not supported and is set to 0 Source Storage Element Address The Source Storage Element Address represents the address of the last storage element that held the cartridge The SValid field indicates whether this information is valid Primary Volume Tag Information If Volume Tag information was requested in the command block VolTag 1 the Primary Volume Tag Information field is included in the element descriptor This information is omitted if PVolTag 0 in the element status page For format see table 4
39. DU Disable Update This bit is not defined for LOG SELECT the target ignores any value in DU DS Disable Save Not supported Must be set to 1 TSD Target Save Disable Not supported Must be set to 1 ETC Enable Threshold Comparison When set to 1 drive performs a comparison with threshold values once the cumulative value is updated Comparison criteria are defined in Threshold Met Criteria TMC If the comparison is met and the RLEC bit of MODE SELECT SENSE Control Page OQAR is set to 1 then a UNIT ATTENTION is generated for all initiators The additional sense code is set to THRESHOLD CONDITION MET If the RLEC bit is 0 and the comparison is met then UNIT ATTENTION is not generated Quantum DX Series Software Interface Guide 155 Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Field Name Description TMC Threshold Met Criteria Once the criteria specified in this field is met and the ETC bit is 1 and the RLEC bit in MODE SENSE SELECT Control Page is set to 1 then UNIT ATTENTION is generated for all initiators The criteria for comparison are Code Basis of Comparison 00b Every update of the cumulative value 01b Cumulative value equal to threshold value 10b Cumulative value not equal to threshold value 11b Cumulative value greater than threshold value The Default Threshold Values are the maximum values that each parameter can attain The Current Cumulative Values are the values
40. DX Series Software Interface Guide Standard Inquiry Data Format Table 10 Standard Inquiry Data Page Code Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h The Page Code Byte 2 in table 9 specifies which page of vital product data information the target shall return The supported Page Code is 80h to return the Serial Number Page see table 11 The format for the Standard Inquiry Data block returned by the DX Series system to the initiator is shown in table 10 Bit Byte 7 6 5 4 3 2 1 0 0 Peripheral Qualifier 0 Peripheral Device Type 8 1 RMB 1 Device Type Modifier 00h 2 ISO Version 0 ECMA Version 0 eae ie p erson 3 P c ow Reserved 0 Response Data Format 02h 4 Additional Length 1Fh 5 Reserved 0000h 6 7 RelAdr WBus32 WBus16 Sync Linked Rsvrd CmdQue SftRes 0 0 0 0 0 0 0 0 MSB 8 15 Vendor ID LSB MSB 16 31 Product ID LSB MSB 32 35 Product Revision Level LSB Quantum DX Series Software Interface Guide 17 Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Peripheral Qualifier e Oindicates the specified DX Series system is currently connected e 3 indicates the specified DX Series system cannot be supported Peripheral Device Type e 08h indicates medium changer device e 1Fh indicates unknown or no device type used in conjun
41. EEE eeusscbss lassoees 125 Vital Product Data Page Codes s sssssessessessissesserrerresresre 126 Inquiry Command 12h 0 eee esses ee teeneneeeneneneneeey 126 Standard Inquiry Data Page Field Descriptions 127 INQUIRY Vendor Unique Bytes Definitions 00 129 Vendor Unique Inquiry Data Page Field Descriptions 131 Supported Vital Product Data Pages Page Data Format 133 Unit Serial Number Page 80h Data Format 133 Unit Serial Number Page Field Descriptions 0 134 Device Identification VPD Page 839 ceeesseseneeeeeneeeee 134 Identification Descriptor eee eecereeseececseeteeeeseseneeeteees 135 Code Setren eren db ecy doch n eE 135 Associa tonni Saud hie a e a E E R 136 Identifier Typessee ren a E R 136 Device Identification VPD Logical Unit ee 137 Device Identification VPD World Wide Name 137 Firmware Build Information Page COh Data Format 138 Firmware Build Information Page COh Field Descriptio s sse neen ni ae 138 Subsystem Components Revision Page C1h Data Format snini a a e teen nace ies 138 Subsystem Components Revision Page Field Descriptions ss vies ienero ees nra a ERE 140 LOAD UNLOAD Command Descriptor Block Datta F OPI beizen n a a E olastea tesa eaiaes 144 xiv Quantum DX Series Software Interface Guide Table 100 Table 101 Table 102 Table 103 Table 104 Table 105 Table 106 Table 107 Table 108 Table 10
42. Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name Description Page Code This field allows the host to select any specific page or all of the pages supported by the drive Allocation This field specifies the number of bytes that the host Length has allocated for returned MODE SENSE data An allocation length of zero indicates that the drive will return no MODE SENSE data This is not considered an error and GOOD status is returned MODE SENSE may be either MODE SENSE 6 or MODE SENSE 10 MODE SENSE 6 data contains a 4 byte header followed by one 8 byte block descriptor followed by zero or more variable length pages depending on the Page Code and Allocation Length MODE SENSE The MODE SENSE 6 and MODE SENSE 10 headers are illustrated in Data Headers the following figures Table 155 MODE Bit Byte 7 6 5 4 3 2 1 0 SENSE 6 Data Header Data Format 0 Mode Sense Data Length 1 Media Type 2 WC Buffered Mode Speed 0 3 Block Descriptor Length 08h 204 Quantum DX Series Software Interface Guide Table 156 MODE SENSE 10 Data Header Data Format Table 157 MODE SENSE Data Header Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Bit Byte 7 6 5 4 3 2 1 0 MSB 0 1 Mode Sense Data Length LSB 2 Media Type 3 WP Buffered Mode Speed 0
43. Format Not supported must be 0 Active Format Not supported Must be 0 Active Partition Only partition 0 is supported Setting this field to any other value causes rejection by the drive with a CHECK CONDITION status sense key ILLEGAL REQUEST set Write Buffer Full Ratio The drive sets this field to 0 The drive uses an automatic adaptive mechanism to adjust its Full Ratio according to the average data rates over the SCSI bus Read Buffer Empty Ratio The drive sets this field to 0 The drive uses an automatic adaptive mechanism to adjust its Empty Ratio according to the average data rates over the SCSI bus Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description Write Delay This field indicates the maximum time that the Time drive will wait with a partially full buffer before forcing the data to tape 100 ms increments The buffer Full Empty ratio which is dynamic can cause data to be written sooner than the Write Delay Time would indicate The Write Delay Time defaults to 200 C8h This causes the buffer to be flushed in 20 seconds Maximum value is 6500 1964h and the minimum is 15 OFh This represents a range from 11 minutes down to 1 5 seconds Values between 0 and 15 on a MODE SELECT are rounded down to 0 This causes the data to go straight to the medium without delay
44. List Field Descriptions Table 130 MODE SELECT 6 Mode Parameter Header Data Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description Mode Page Format The Page Format bit indicates that the Parameter data sent by the host after the MODE SELECT header Header and block descriptors complies with the definition of pages in the SCSI 2 specification The SCSI 1 format will not be implemented so this bit must be set to 1 It is an ILLEGAL REQUEST to have page parameters while the PF bit is 0 Mode 8 bytes in length allows the initiator to set the drive s Parameter Logical Block Size and number of Descriptor Logical Block Block Addresses Descriptor Page s The Page Code s of the pages that are a part of this MODE SELECT command Mode Parameter Header The figure and table that follow provide an illustration and description of the fields that make up the MODE SELECT command s Mode Parameter header Bit Byte 7 6 5 4 3 2 1 0 0 Reserved 1 Media Type 2 Ignored Buffered Mode Speed 3 Block Descriptor Length 08h Quantum DX Series Software Interface Guide 175 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 131 MODE Bit Byte 7 6 5 4 3 2 1 0 SELECT 10 Mode Parameter Header 0 1 Reserved Data Format 2 Media Type 3 Ignored Buffered Mode Spe
45. Load Unload 0 Locate 0 Log Select Parameter List must be 0 Log Sense Allocation Log Page Mode Select 6 Parameter List Mode Parameter 10 Header 4 Block Descriptor 8 Page s Mode Sense 6 Allocation Mode Parameter Header 10 4 Block Descriptor 8 Page s Prevent Allow 0 Medium Removal Read Transfer Data Read Block Allocation Block Length Limits Limits Read Buffer Allocation Buffer Offset and Allocation Length 116 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Command Length in CDB Data Out To Drive Data In To Initiator Read Position Allocation Position Identifier or SCSI Logical Address Receive Allocation Diagnostic Page Diagnostic Results Release Unit 0 Request Sense Allocation Sense Data 18 Reserve Unit 0 Extent list option not supported Rewind 0 Send Diagnostic Parameter List Diagnostic Page Space 0 Test Unit Ready 0 Verify Transfer Data Write Transfer Data Write Buffer Parameter List Microcode Image Data Write Filemarks Quantum DX Series Software Interface Guide 117 Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Unit Attention Condition Behavior at Power On and SCSI Bus Reset 118 Queued Unit Attentions are implemented on the Quantum DLT7000 tape drive and are maintained separa
46. Page Code 0Fh 1 Page Length OEh 2 DCE DCC Reserved 1 3 DDE RED 00 Reserved 1 MSB 4 7 Compression Algorithm 10 LSB MSB 8 11 Decompression Algorithm 10 LSB 12 15 Reserved Quantum DX Series Software Interface Guide Table 144 Data Compression Page Descriptor Field Descriptions Field Name PS Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Description The Page Code identifies the type of MODE SELECT page being transferred A value of OFh identifies this as the Data Compression page Page Length The Page Length field indicates the number of bytes in the Data Compression page that follow this byte The valid value for this byte is OEh DCE Data Compression Enable This bit specifies whether the tape drive should enable or disable data compression When set to 1 the drive starts in compressed format DDE Data Decompression Enable Must be set to 1 When the tape drive reads compressed data from tape it automatically decompresses the data before sending it to the initiator Data compression must always be enabled RED Report Exception on Decompression The tape drive does not report exceptions on decompression boundaries between compressed and uncompressed data The RED field must be 00h Quantum DX Series Software Interface Guide 189 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name
47. Primary Volume Tag Information Field omitted if PVolTag 0 48 51 Reserved 00000000h 52 Vendor Unique 0000h 53 Element Address This field indicates the address of the element being reported by that element descriptor Access e Anaccess bit value of 1 indicates that access to the element by a medium transport element is allowed e The access bit may be set to 0 or 1 for the bins in the 2 removable packs e Access bit is always set to 1 for the other non removable bins in the system Except e When the element is in a normal state it is set to 0 e When the element is in an abnormal state it is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields in the element descriptor For the meaning of the codes contained in the two Sense Code fields see Request Sense 03h on page 75 Full e The Full field is set to 1 whenever the element contains a tape cartridge e Itis set to 0 otherwise Additional Sense Code and Additional Sense Code Qualifier Quantum DX Series Software Interface Guide 63 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h These fields are only valid if the Exception field is set to 1 SValid e The SValid bit is set to 1 if the information in the Source Storage Element Address field is valid e If information is unknown due to a door open or power on condition the SValid bit
48. Reserved 2 Select Report 3 5 Reserved MSB 6 9 Allocation Length LSB 10 Reserved 11 Control e Allocation Length If the Allocation Length is not sufficient to contain the logical unit number values for all configured logical units the device server still reports as many logical number values as will fit in the Allocation Length The format of the report of configured logical units is shown in table 50 Quantum DX Series Software Interface Guide 73 Chapter 2 Emulated Medium Changer SCSI Commands Report LUNS AOh Table 50 LUN Bit Byte 7 6 5 4 3 2 1 0 Reporting Parameter List MSB 0 3 LUN List Length n 7 LSB 4 7 Reserved MSB 8 15 LUN first LUN LSB n 7 n LUN last LUN if more than one The LUN List Length field contains the length in bytes of the LUN list that can be transferred The LUN list length equals the number of logical unit numbers reported multiplied by eight If the allocation length in the CDB is too small to allow transfer of information about all of the logical units configured the LUN list length value is not adjusted to reflect the truncation 74 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Request Sense 03h Request Sense 03h Table 51 Request Sense Command The Request Sense command allows the host to receive sense data from the DX Series system The DX Serie
49. Table 48 Release Bit Byte 7 6 5 4 3 2 1 0 Command 0 Operation Code 17h Element 1 Logical Unit Number 3rdPty 3rd Party ID 0 2 Reservation ID 3 Reserved 00h 4 Reserved 00h 5 Unused Reserved 00h Flag 0 Link 0 Logical Unit Number The Logical Unit Number is 0 This field indicates the logical unit to which the command is sent e 3rdPty and 3rd Party ID The 3rd party release option allows an initiator to release a logical unit or elements that were previously reserved using the 3rd party reservation option e Ifthe 3rdPty bit is 0 then the 3rd party release option is not requested and the command only releases a unit or elements that were reserved without 3rd party reservation Quantum DX Series Software Interface Guide 71 Chapter 2 Emulated Medium Changer SCSI Commands Release 17h e If the 3rdPty bit is 1 the unit or elements released were originally reserved by the same initiator using the 3rd party reservation option and if the device is the same SCSI device that was specified in the 3rd party device ID 3rd Party ID field e Element ID The Element field specifies whether this command is a Unit Release e If the value is 0 the command releases a reservation placed on this unit by the requesting initiator that meets 3rd party release requirements if applicable Reservation ID If the value is 1 the command releases all elements reserved by the requesting ini
50. Threshold Values are reset to the Default Threshold Values This is equivalent to no change since Threshold Values cannot be modified When the PC field is set to 11b and the Parameter List Length field is set to 0 then all Current Cumulative Values are reset to the Default Cumulative Values This is equivalent to clearing all log pages that can be cleared Quantum DX Series Software Interface Guide 151 Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Log Detection Summary in LOG SELECT Command Descriptor Block Operation of LOG SELECT 152 Field Name Description Parameter List This field specifies the length in bytes of the Length LOG SELECT parameter list to be transferred from the initiator to the target during the DATA OUT phase A parameter list length of 0 indicates that no data is to be transferred This condition is not considered an error Partition Not applicable see Change Partition field above The following conditions constitute errors that are detected by the drive in relation to the CDB The request sense data is set to ILLEGAL REQUEST INVALID FIELD IN CDB The conditions that constitute errors are e PCR bit is set to 1 and parameter list is not set to 0 e SP bit is set to 1 A parameter list length that would cause a parameter within a valid page to be truncated or otherwise incompletely initialized The LOG SELECT command allows the initiator to modify and
51. Transport Elements Field defines total number of data transfer elements contained within the medium changer and accessible to medium transport elements The format for the Transport Geometry Parameters Page is shown in table 34 Quantum DX Series Software Interface Guide 45 Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah Table 34 Mode Sense Data Trans Geometry Para Page 46 Bit Byte 7 6 5 4 3 2 1 0 Rsrvd 0 PS 0 o Page Code 1Eh 1 Parameter Length 02h TRANSPORT GEOMETRY DESCRIPTOR Rotate 2 Reserved 00h 0 3 Member Number In Transport Element Set 00h PS Parameters Savable This bit of 0 indicates the target is not capable of saving the page ina nonvolatile vendor specific location e Parameter Length There are 2 bytes of parameter information e Transport Geometry Descriptor The geometry of each medium transport element is defined using a two byte field Rotate A rotate bit of 0 indicates the medium transport element does not support media rotation Member Number In Transport Element Set The first element in a set has a member number of 0 The format for the Device Capabilities Page is shown in table 35 Quantum DX Series Software Interface Guide Table 35 Mode Sense Data Device Capabilities Data Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah
52. Value 00h Description Reserved 1h Vendor ID followed by the product identification field from the standard inquiry data and the serial number field from the Serial Number Inquiry Page 2h Canonical form of the IEEE Extended Unique Identifier 64 bit EIU 64 3h FC PH Name_Identifier 4h to fh Reserved 136 Quantum DX Series Software Interface Guide Table 93 Device Identification VPD Logical Unit Table 94 Device Identification VPD World Wide Name Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Bit Byte 7 6 5 4 3 2 1 0 0 Protocol Identifier 0 Code Set 2 1 Rsvd 0 Association 0 Identifier Type 1 2 Reserved 0 3 Identifier Length n 3 MSB 4 n Vendor and Product ID Serial Number LSB Bit Byte 7 6 5 4 3 2 1 0 0 Protocol Identifier 0 Code Set 1 1 Rsvd 0 Association 0 Identifier Type 2 2 Reserved 0 3 Identifier Length 8 MSB 4 11 IEEE Extended Unique Identifier LSB Quantum DX Series Software Interface Guide 137 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Table 95 Firmware Build Information Page COh Data Format Table 96 Firmware Build Information Page COh Field Descriptions Table 97 Subsystem Components Revision Page C1h Data Format 138 Bit Byte 7 6 5 4 3 2 1 0 0
53. Volume Tag B6h The Send Volume Tag command evaluates element descriptors found by a Send Volume Tag command The type of element medium transfer storage import export or data transfer can be specified in the command as well as the starting address for evaluation The format of the Send Volume Tag command is shown in Table 67 Table 67 Send Bit Byte 7 6 5 4 3 2 1 0 Volume Tag Command 0 Operation Code B6h 1 Logical Unit Number Rsrvd Element Type Code 2 MSB Starting Element Address 3 LSB 4 Reserved 00h 5 Reserved 0h Send Action Code 05h 6 Reserved 0000h 7 8 MSB Parameter List Length 0028h 9 LSB 10 Reserved 00h 11 Reserved 00h e Logical Unit Number The Logical Unit Number is 0 Element Type Code This field is used to indicate which type of element medium transport storage data transfer or all is to be acted on by this command 102 Quantum DX Series Software Interface Guide Table 68 Send Volume Tag Parameters Chapter 2 Emulated Medium Changer SCSI Commands Send Volume Tag B6h 0 indicates all element types reported 1 indicates medium transport element 2 indicates storage element 3 indicates import export element 4 indicates data transfer elements Starting Element Address The Starting Element Address field specifies the starting point of the Volume Tag evaluation Beginning with the first
54. and the tape is logically positioned after the block EOM side Fixed This bit specifies whether fixed length or variable length blocks are to be transferred and gives meaning to the Transfer Length field of the READ command When set to 0 variable block mode is requested A single block is transferred with the Transfer Length specifying the maximum number of bytes the initiator has allocated for the returned data When the Fixed bit is set to 1 the Transfer Length specifies the number of blocks to be transferred to the initiator This is valid only if the logical unit is currently operating in Fixed Block mode When the Transfer Length is 0 no data is transferred and the current position on the logical unit does not change This is not an error condition A successful READ with Fixed bit set to 1 transfers current block length x of blocks x block size bytes of data to the host Upon termination of READ the medium is logically positioned after the last block of data transferred FOM Note that a READ command in fixed mode with an odd number of blocks returns a CHECK CONDITION the DLT7000 tape drive does not support odd block number transfers 230 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Read 08h Filemark End of Data and End of Medium Partition Handling If the tape drive reads a Filemark it returns a CHECK CONDITION status Within the sense data the Filema
55. blocks to be transferred between the initiator and the drive For several commands the transfer length indicates the number of bytes not blocks to be sent For these commands this field may be identified by a different name Parameter List Length The Parameter List Length is used to specify the number of bytes sent during the DATA OUT phase This field is typically used for parameters that are sent to a drive for example mode diagnostic and log parameters A parameter list length of 0 indicates that no data is to be transferred Quantum DX Series Software Interface Guide 111 Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Field Allocation Length Description The Allocation Length field specifies the number of bytes that the initiator has allocated for returned data The Allocation Length is used to limit the amount of data returned to the initiator An Allocation Length of 0 indicates that no data is to be transferred from the drive to the initiator The drive terminates the DATA IN phase when the specified number of bytes have been transferred to the initiator or when all available data has been transferred whichever is less Control Field The Control Field is the last byte of every command descriptor block Its format is shown in table 73 and described in table 74 and it contains the Flag and Link bits Tech Tip Flag and Link bits are not supported by the DX Series
56. cece eeseseeeeeeseeenees 64 Data Transfer Element Descriptor cece eeeeeneeeeeees 67 Quantum DX Series Software Interface Guide Table 47 Table 48 Table 49 Table 50 Table 51 Table 52 Table 53 Table 54 Table 55 Table 56 Table 57 Table 58 Table 59 Table 60 Table 61 Table 62 Table 63 Table 64 Table 65 Table 66 Table 67 Table 68 Table 69 Table 70 Table 71 Table 72 Table 73 Table 74 Tables Alternate Volume Tag Information uu cece 69 Release Commandin sene dbasvevsh shavtardssntastetenondes 71 Report LUNS Command sssssesessesessesessresserssreresrereerereererrereene 73 LUN Reporting Parameter List cccesscseseeseseeenseeeeees 74 Request Sense Command ceeciscssseesereeseeseesseeeseeseenseeeeees 75 Request Sense Data rro arna n a teenies 76 Request Volume Element Address Command ee 79 Volume Element Address Header uu cceeeeeeeeeeeeees 83 Element Status Page ccc eeccscseseseeceesesesescsceeseseecececenanseeeenes 84 Medium Transport Element Descriptor se esseseesereeeereeeneee 85 Primary Volume Tag Information cee eens 87 Alternate Volume Tag Information cee eeeeeseseeteneeees 87 Storage Element Descriptor 0 c cece es ceeeeeeeeeeneteteeees 87 Import Export Element Descriptor eeeeeeeseeeeseeeeenees 90 Data Transfer Element Descriptor sesssesessesesseressererreresrereese 92 Reserve Command ss sersan E a teense RRN 96 Element List Descrip
57. computed since the last reset of the device either via power cycle BUS DEVICE RESET or SCSI RESET The Default Cumulative Values are the values to which each parameter is initialized at a reset condition Default values are zero By default Current Threshold Values Default Threshold Values Note that all types of parameter values are changeable via LOG SELECT LP List Parameter This bit should always be set to 0 to indicate parameter codes are treated as data counters 156 Quantum DX Series Software Interface Guide Error Detection Summary in LOG SELECT Pages Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Field Name Description Parameter Length This field specifies the number of bytes of the parameter value Parameter Value This field indicates the actual value of this log parameter The host issues a LOG SENSE command to initialize host resident software that allows determination of The log pages used by the drive The parameter codes and length of each parameter The following conditions constitute errors in the parameter block that cause the drive to return CHECK CONDITION with sense data set to ILLEGAL REQUEST and additional send code INVALID FIELD IN PARAMETER LIST A page header is received with unsupported page codes An incorrect log page length is specified in the page header An illegal parameter code is contained in a valid page code Parameter codes for a suppor
58. data either in response to a Request Sense command or as an unsolicited message The DX Series system does not support asynchronous event notification This simplifies the host DX Series interface and is acceptable because events happen infrequently and do not require an immediate host response DX Series system events are queued To check for DX Series system events the SCSI host can issue a Request Sense command to the device This command causes the DX Series system to return event sense data The host can issue a Request Sense command repeatedly to obtain sense data for each queued event The most significant events are detailed in this section e Power Cycle e DxX Series Unit On Line Initialization Failure When the DX Series system is powered on it generates a Power On Reset Occurred event GK 6 ASC 29 ASCO 00 When a DX Series system is placed on line and initialization fails the DX Series system generates an event for the error condition that caused the failure Quantum DX Series Software Interface Guide 5 Chapter 1 Theory of Operation Operational Sequences Operational Sequences Power On On Line Initialization Operational sequences are listed in order of precedence These operational sequences are detailed in this section e Power On e System Stopped e On Line Initialization e DX Series System Unit Inventory e Off Line When the DX Series system is powered on it goes through an initialization sequ
59. defined type matching elements are reported until reports for the indicated number of elements have been returned e Allocation Length This field specifies how much memory the host has set aside to store the status information returned by the DX Series system e This field should be set to a number that is large enough to store the status information for the requested number of elements Ifthe field is not large enough the DX Series system only reports the status information for the number of elements whose status information fits within the allocated space The returned Request Volume Element Address Data has the general structure as depicted in figure 2 Quantum DX Series Software Interface Guide 81 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Figure 2 Request Volume Element Address Data Request Volume Element Address Data Request Volume Element Address Data Header Element Status Data Page first or only Element Status Data Page Header Element Descriptor first or only Other Element Descriptors if any Other Status Data Pages if any A single Volume Element Address Header is returned along with 1 or more element status pages The Volume Element Address indicates e Address of the first element reported e Number of elements reported e Action code of the reported Send Volume Tag command e Size of the r
60. dependent Table 5 5 lists the information transmitted for all of the commands The Length in CDB column of Table 5 5 identifies the Command Descriptor Block field used by the drive to determine how much command related data are to be transferred The units bytes or logical blocks for the different Length fields are implied by the Length Field Name as follows Field Name Units Implied Allocation Length Bytes of data the drive is allowed to send to the initiator Parameter List Length Bytes of data the initiator has available for the drive Transfer Length Logical number of data blocks or data bytes the initiator wants transferred or verified Byte Transfer Length Bytes of data the initiator wants transferred The DATA OUT column in table 76 lists the information passed to the drive by the initiator as part of the command The DATA IN column lists the information sent to the initiator by the drive Numbers in parentheses Quantum DX Series Software Interface Guide 115 Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Table 76 DATA Phase Command after an item indicate the item s length in bytes In some cases additional length information is communicated during the DATA phase Contents Command Length in CDB Data Out To Drive Data In To Initiator Frase 0 Inquiry Allocation Standard inquiry or a vital product data page
61. in the page Note that this value does not include bytes 0 and 1 The length is returned on MODE SENSE and must subsequently be set to the same value when performing MODE SELECT Page codes and pages that are supported are Page Code Description Sense Select 00h No Requested Page SENSE 01h READ WRITE Error BOTH Recovery Page 02h Disconnect Reconnect Page BOTH OAh Control Mode Page BOTH OFh Data Compression Page BOTH 10h Device Configuration Page BOTH 11h Medium Partition Page BOTH 1Ch TapeAlert Page BOTH 3Eh EEPROM Vendor Unique Page BOTH 3Fh All Pages Except EEPROM BOTH 210 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah READ WRITE Error Recovery Page 01h The tape drive supports the Error Recovery Page for READ and WRITE operations The format for the page is illustrated in the following figure Table 162 Read Bit Byte 7 6 5 4 3 2 1 0 Write Error Recovery Page Data Format 0 PS 0 0 Page Code 01h 1 Additional Page Length 01h 2 Rsv d Rsv d TB Rsv d EER PER DTE 0 DCR 0 3 READ Retry Count 4 7 Reserved 8 WRITE Retry Count 9 11 Reserved Quantum DX Series Software Interface Guide 211 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Table 163 Read Write Error Recovery Page Field Descript
62. indicates the number of bytes in each element descriptor Byte Count of Descriptor Data Available Quantum DX Series Software Interface Guide Table 56 Medium Transport Element Descriptor Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h The Byte Count of Descriptor Data Available indicates the number of bytes minus 7 of descriptor data excluding this header that are returned for the descriptors of the specified type if an adequate allocation length had been specified There are 4 different types of element descriptor blocks one for each type of element There are several fields which are found in more than 1 type of element descriptor as well as fields which are unique to an element descriptor The fields common to more than 1 type of element descriptor have the same name in the illustrations and descriptions that follow The format of an element descriptor for an element of the medium transport element type is shown in table 56 Bit Byte 7 6 5 4 3 2 1 0 0 MSB Element Address 1 LSB 2 Reserved 00h Except Rsvd 0 Full 3 Reserved 00h 4 Additional Sense Code 5 Additional Sense Code Qualifier 6 7 Reserved 000000h 8 9 2i a Reserved 00h 10 Source Storage Element Address 0000h 11 12 47 Primary Volume Tag Information if present Quantum DX Series Software Interface Guide 85 Ch
63. length Only limit is a multiple of 2 where is the value in the Granularity bits and n is greater than or equal to the Minimum Block Length Limit and less than or equal to the Maximum Block Size Limit For the DLT7000 system the content of the Granularity field is 1 since block sizes must be a multiple of 2 212 For backward compatibility the DLT7000 will process requests that do not meet Granularity criteria except for Odd byte Multiple Block Fixed Block WRITE commands when connected to a Wide 16 bit SCSI bus Maximum The value in this field indicates the maximum block size The tape drive Block supports a maximum block length of 16 777 214 16 MB 2 for 10 20 or 35 GB Length format A maximum block length of 256 K bytes is supported for 2 6 GB or 6 0 GB formats Minimum The value in this field indicates the minimum block size The tape drive Block supports a minimum block length of 2 bytes Length Quantum DX Series Software Interface Guide 233 Chapter 3 Emulated DLT7000 SCSI Commands Read Buffer 8Ch Read Buffer 3Ch Table 183 READ BUFFER Command Descriptor Block Data Format 234 The READ BUFFER command is used in conjunction with WRITE BUFFER as a diagnostic function for testing the drive s data buffer for possible diagnostic data and for checking the integrity of the SCSI bus In addition by using buffers 1 and 2 the READ BUFFER command allows the contents of the tape system s local RAM EEPRO
64. manner that a command has been completed Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands Quantum DX Series Software Interface Guide 97 Chapter 2 Emulated Medium Changer SCSI Commands Reserve 16h If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system Starting Element Address and Number of Elements e These fields select the range of elements to be reserved The reservation begins with the first element with an address greater than or equal to the Starting Element Address and includes all defined elements until the indicated number of elements have been reserved or the last element is reached e All the specified elements must be able to be reserved or no reservations take place at all 98 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Rezero Unit 01h Rezero Unit 01h The Rezero Unit command allows the host to home all DX Series system mechanisms
65. most cases Additional Sense Code and or Qualifier information is available The codes and qualifiers are covered in detail in Table 5 72 Information Bytes These bytes contain the differences residue of the requested length minus the actual length in bytes blocks or Filemarks as determined by the command Negative values are indicated by two s complement notation The bytes are valid for all READ WRITE SPACE and VERIFY tape commands for which a CHECK CONDITION status has been generated The information bytes are 0 for MODE SELECT SENSE INQUIRY READ BLOCK LIMITS and TEST UNIT READY Additional Sense Length This field specifies the number of additional sense bytes to follow If the Allocation Length of the Command Descriptor Block is too small to transfer all of the Additional Sense bytes the Additional Sense Length is not adjusted to reflect the truncation Command Specific Information Bytes Command Specific Information Bytes can be logged by the operating system on error conditions On tape medium errors such an entry usually contains the current SCSI Logical Block Address Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Request Sense 03h Field Name Description Additional This field and the field for Additional Sense Code Sense Code Qualifier provide additional information about the Sense Key and cause of a CHECK CONDITION
66. partitions 194 Quantum DX Series Software Interface Guide Table 147 Medium Partition Page Format Descriptor Data Format Table 148 Medium Partition Page Descriptor Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 0 Page Code 11h 1 Additional Page Length 06 2 Maximum Additional Partitions 0 3 Additional Partitions Defined 0 4 FDP 0 SDP 0 IDP 0 PSUM 0 Reserved 5 Medium Format Recognition 01 6 7 Reserved Field Name Description PS Parameters Savable For MODE SELECT this bit must be 0 Additional This field indicates the number bytes in the page Page Length However the value does not include bytes 0 and 1 The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT If the page length does not match that expected by the drive a CHECK CONDITION status is returned sense key set to ILLEGAL REQUEST The drive returns a CHECK CONDITION status with sense key set to ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field with values not supported or changeable In such cases no parameters are changed as a result of the command Maximum Not supported Must be 0 Additional Partitions Quantum DX Series Software Interface Guide 195 Chapter 3 Emulated DLT7000 SCSI Commands Mode
67. provides the means to retrieve identification descriptors applying to the logical unit Logical units may have more than one identification descriptor e g if several types of associations of identifier are supported Device identifiers shall be assigned to the peripheral device and not to the currently mounted media in the case of removable media devices Quantum DX Series Software Interface Guide 21 Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Table 13 Device Identification VPD Page 83h Table 14 Identification Descriptor 22 Bit Byte 7 6 5 4 3 2 1 0 0 Peripheral Qualifier 0 Peripheral Device Type 8 1 Page Code 83h 2 Reserved 00h 3 Page Length n 3 Identification Descriptor list Identification descriptor first Identification descriptor last e Identification Descriptor Each identification descriptor see table 14 contains information identifying the logical unit physical device or access path used by the command and returned parameter data The association field indicates the entity that the identification descriptor describes If a physical or logical device returns the identification descriptor with the association field set to 0h it shall return the same descriptor when it is accessed through any other path Bit Byte 7 6 5 4 3 2 1 0 0 Reserved Code Set 1 Reserved Association Identifi
68. set to 1 if information in the Source Storage Element Address field is valid e If information is unknown due to a door open or power on condition the SValid bit is set to 0 Invert The Invert field is not supported and is set to 0 Source Storage Element Address The Source Storage Element Address represents the address of the last storage element that held the cartridge The SValid field indicates whether this information is valid Primary Volume Tag Information If the Volume Tag information was requested in the command block the Primary Volume Tag Information field is included in the element descriptor For format see table 57 Alternate Volume Tag Information If the Volume Tag information was requested in the command block and Drive Serialization is enabled the Alternate Volume Tag Information field is included in the element descriptor and includes the drive serial number in an ASCII text string The serial number is preceded by 4 null characters For format table 58 Note For more information on enabling Drive Serialization see the Mode Select command SER bit and the Mode Sense command SER bit 94 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Reserve 16h Reserve 16h This command reserves the specified DX Series system or elements for exclusive use by the requesting initiator or another specified SCSI device The reservation remains in e
69. tape medium is not the appropriate type or if a software write protect is issued 8h BLANK CHECK An End of Data or LongGap has been encountered Bh COMMAND ABORTED This key is generated when a command has been aborted by the tape drive for some reason Check the Additional Sense Code Additional Sense Code Qualifier bytes Dh VOLUME OVERFLOW This key indicates that the physical end of tape medium has 280 been reached during writing The initiator ignored the End of Medium condition and continued to write to tape Quantum DX Series Software Interface Guide Appendix B Media Changer Sense Code Values The following table lists message information that can be sent from the media changer to the host computer The sense data table is sorted by the data in the ASC column second column from left and lists the following information Additional Sense Code ASC Additional Sense Code Qualifier ASCQ Message name description and potential recovery action Valid Interfaces SCSI host computer DIAG diagnostic port computer Both SCSI and DIAG port Message name and description may contain abbreviations as follows LU Logical Unit REQ D Required DEV Device DIAG Diagnostics NVRAM Nonvolatile RAM A D Analog to Digital Quantum DX Series Software Interface Guide 281 Appendix B Media Changer Sense Code Values Table 227 Sense Data Values Hexadecimal ASC 00 ASCQ 00 Message Name Description
70. the U S Federal Communications Commission governing electromagnetic emissions gripper assembly The assembly that grips cartridges host computer The computer that issues SCSI commands to control the DX Series system robotics identify initiator to target message This SCSI 2 message is sent to establish communication with the DX Series system identify target to initiator The host sends this SCSI 2 message to the DX Series system to identify the DX Series system to which the command is being sent inquiry command Determines devices attached to the SCSI bus and request a description from each device initialize element status command Allows the host to request an inventory of the tape cartridges held in a DX Series system initialize element status with range command Allows the host to request an inventory of a range of elements in the DX Series system initialization sequence Actions that occur when the DX Series system is initially powered on This includes a DX Series system reset initialization of all hardware and a response to the Inquiry Request Sense Log Sense and Mode Sense commands initiator detected error message This SCSI 2 message is sent to the DX Series system to inform it that an error has occurred that does not preclude the DX Series system from retrying the operation log sense command Retrieves statistical information maintained by the logical unit Quantum DX Series Software Interface Guide
71. zero 25 00 LOGICAL UNIT IS NOT SUPPORTED Verify the logical unit field specified in the command contains a legitimate logical unit number Check cabling to logical unit 26 00 INVALID FIELD IN PARAMETER LIST Verify Mode Select page fields Verify that fields comply with command format described in this guide 26 02 PARAMETER VALUE INVALID Verify Mode Select page fields Verify that fields comply with command format described in this guide This response is also returned for commands issued to the diagnostic interface of the DX Series system if an invalid parameter is sent 29 00 POWER ON RESET OR BUS DEVICE RESET OCCURRED Informational message If power on occurs the host user should assume the inventory may have been corrupted and should ask the DX Series system for that information again 29 01 POWER ON RESET OCCURRED 29 02 BUS RESET OCCURRED Quantum DX Series Software Interface Guide 283 Appendix B Media Changer Sense Code Values ASC ASCQ Message Name Description 29 03 BUS DEVICE RESET OCCURRED 29 04 INTERNAL DEVICE RESET OCCURRED 2A 01 MODE PARAMETERS CHANGED Mode parameters may have changed due to another host issuing a Mode Select command 39 00 SAVING PARAMETERS NOT SUPPORTED Verify Save Parameter field in the Mode Sense command complies with the command format described in this guide 3A 00 MEDIUM NOT PRESENT
72. 0 00 No Additional Sense Code 00 01 Unexpected FM Encountered 00 02 End of Medium EOM Encountered 00 03 SetMark Encountered 00 04 Beginning of Medium BOM Encountered 00 05 EOD Encountered 00 17 Clean Requested Non Vendor Unique 0A 00 Error Log Overflow 0A 80 Error Log Generated 0C 00 WRITE Frror possible tape medium problem cleaning tape needed 0C 80 Write SCSI FIFO CRC Error 04 00 Unit Not Ready Cause Nonreportable 04 02 Unit Not Ready LOAD Command Needed 08 00 LUN Communication Failure 08 01 LUN Communication Timeout Failure 11 00 Unrecovered READ Error 11 08 Unrecovered READ Error Incomplete Block Read 11 80 Read SCSI FIFO CRC Error 11 81 Block Port Detected EDC Error 11 82 Block Port Detected Record CRC Error 290 Quantum DX Series Software Interface Guide Appendix C DLT7000 Sense Code Values ASC ASCQ Description 14 00 Recorded Entity Not Found logical DLT block not found 15 02 Position Error Detected by Read of Medium 1A 00 Parameter List Length Error 20 00 Illegal Opcode 20 81 Illegal Command While In Recovery Mode 21 01 Invalid Element Address 24 00 Invalid CDB Field may occur if odd block counts are attempted in fixed mode 24 81 Invalid Mode on WRITE Buffer 24 82 Media in Drive 24 84 Insufficient Resources 24 86 Invalid Offset 24 87 Invalid Size 24 8C Not Immediate Command 25 00 Illegal LUN 26 00 Parameter List Error Invali
73. 00 0 0 cece eeeeeeeceeeeseeteeeeeeeteteeeeees 3 DX3000 Storage Elements 0 cece ee ceeeeseeeeeeceeeneteeeeenes 4 DX5000 Storage Element 0 0 0 0 cece ee cseeeseeeeeeeeeeneteeeeees 4 SCSI 2 Ter eiir erir r E EEE ENE EEEE 9 Supported Operational Commands 0 eee eeeeeteneeeeeeeee 11 Initialize Element Status Command eee eee 13 Initialize Element Status with Range Commanid 14 Inquiry Command Data Format 0 0 cee eee etree teens 16 Standard Inquiry Data seescseseseescseseseseecscseseseeeeeses 17 Supported Vital Product Data Page eee eeeeeeee tenes 20 Unit Serial Number Page Page 80h eee eens 21 Device Identification VPD Page 839 eeeeseeteseeeseneneeeee 22 Identification Descriptor 0 eseseseeeceeseeeseeesescnseeeeeeeaees 22 Code Set riirii aeii a Er C ERRERA 23 ASSOCIA MON wi Bini e r Ae S EE EE E EEE EEEE E EEES ENS 23 Identitiet Type esneinoninannnni ania 24 Quantum DX Series Software Interface Guide xi Tables xii Table 18 Table 19 Table 20 Table 21 Table 22 Table 23 Table 24 Table 25 Table 26 Table 27 Table 28 Table 29 Table 30 Table 31 Table 32 Table 33 Table 34 Table 35 Table 36 Table 37 Table 38 Table 39 Table 40 Table 41 Table 42 Table 43 Table 44 Table 45 Table 46 Device Identification VPD Logical Unit 0 0 0 24 Device Identification VPD World Wide Name 0 25 Log Sense Command cece cssesssssessseesseseseseseesesees 26 Support
74. 1 0 0 Operation Code 17h 1 Logical Unit Number 3rd Pty Third Party Device ID Rsv d 2 4 Reserved 5 Unused Reserved Flag 0 Link 0 Field Name 3rdPty Description The third party release option for RELEASE UNIT allows an initiator to release a logical unit that was previously reserved using the third party reservation option If this bit is 0 then the third party release option is not requested If this bit is set to 1 the drive is released if it was originally reserved by the same initiator using the third party reservation option and if the tape drive is the same SCSI device specified in the Third Party Device ID field Third Party Device ID Required if the 3rdPty bit is 1 This field specifies the SCSI ID of the initiator whose third party reservation is being released This field must be set if the initiator of the original third party RESERVE is the source of the RELEASE Quantum DX Series Software Interface Guide 243 Chapter 3 Emulated DLT7000 SCSI Commands Release Unit 17h Field Name Reservation ID Description If the value is 1 the command releases all elements reserved by the requesting initiator that were reserved with the same Reservation ID value as this release attempt and that meet 3rd party release requirements if applicable Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedi
75. 2 1 0 MSB 16 17 Field Pointer LSB 18 Internal Status Code VU 19 20 Tape Motion Hours 21 24 Power On Hours 25 28 Tape Remaining 29 Reserved Table 202 REQUEST Field Name Description SENSE Data Field Descriptions Valid When set to 1 this field indicates that the information bytes contain valid information as defined in the ANSI SCSI 2 specification Error Code A value of 70h indicates a current error the report is associated with the most recently received command A value of 71h indicates a deferred error the report is associated with a previous command and not as a result of the current command No other values are returned in this field Segment This value of this byte is always 0 Number Filemark This bit indicates that the current command has read a Filemark Quantum DX Series Software Interface Guide 249 Chapter 3 Emulated DLT7000 SCSI Commands Request Sense 03h 250 Field Name EOM Description End of Medium This bit indicates that an End of Medium condition End of Partition or Beginning of Partition exists The warning is also given by setting the Sense Key to NO SENSE and the Additional Sense Qualifier to End of Partition or Beginning of Partition ILI Sense Key Incorrect Length Indicator This bit indicates that the requested logical block length did not match the logical block length of the data on the tape medium Only READ or VERIFY may cause this bit to be set In
76. 26 mode select 32 mode sense 39 move medium 50 Index position to element 52 read element status 54 release 71 request sense 75 request volume element address 79 reserve 95 rezero unit 99 send diagnostic 100 send volume tag 102 test unit ready 105 D Devices attached to scsi bus inquiry command 16 17 Drive serialization enabling 33 E Enabling drive serialization 33 Quantum DX Series Software Interface Guide 317 Events power cycle 5 request sense command 5 Initialize element status command 13 Initialize element status with range command 14 15 INQUIRY Command 124 INQUIRY command 16 17 Inquiry command command data format 16 standard inquiry data format 17 unit serial number page 17 21 L Library events power on reset occurred 5 request sense command 5 Log sense command 26 Icommand table 26 log parameter 29 log parameter codes 30 log parameter codes for drive raw status 32 medium changer statistics page 28 supported log page 27 Logical unit statistics log sense command 26 LUN Reporting Parameter List 74 246 Medium changer command 2 Messages from library to host 281 289 Mode select command 32 37 command format 32 element address assignment page 35 enabling drive serialization 33 vendor unique page 33 Mode sense command 39 command format 39 data header table 41 device capabilities data format 46 transport geometry parameters page 45 vendor unique page format
77. 3 Alternate Volume Tag Information If the Volume Tag information was requested in the command block VolTag 1 and Drive Serialization is enabled mode page 20h SER 1 the Alternate Volume Tag Information field is included in the element descriptor and includes the drive serial number in an ASCII text string The serial number is preceded by four null characters For format see table 47 Note For more information on enabling Drive Serialization see the Mode Select command Vendor Unique Page 20h SER bit and the Mode Sense command SER bit Bit Byte 7 6 5 4 3 2 1 0 0 3 Reserved Quantum DX Series Software Interface Guide 69 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Bit Byte 7 6 5 4 3 4 16 Drive Serial Number 17 35 Reserved Drive Serial Number This field is 12 bytes 70 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Release 17h Release 17h The Release command releases the DX Series system or elements that match the specified release parameters Note Itis not an error to attempt to release the DX Series system if it is not currently reserved by the requesting initiator However if the DX Series system is reserved by another initiator the DX Series system is not released
78. 4 Quantum Q D 9g Software Interface Guide Software Interface Guide Software Interface Guide Quantum DX30 DX100 DX3000 and DX5000 81 81495 01 A01 Quantum DX Series Software Interface Guide 81 81495 01 A01 November 2005 Made in USA Quantum Corporation provides this publication as is without warranty of any kind either express or implied including but not limited to the implied warranties of merchantability or fitness for a particular purpose Quantum Corporation may revise this publication from time to time without notice COPYRIGHT STATEMENT Copyright 2005 by Quantum Corporation All rights reserved Your right to copy this manual is limited by copyright law Making copies or adaptations without prior written authorization of Quantum Corporation is prohibited by law and constitutes a punishable violation of the law TRADEMARK STATEMENT DLT SDLT DLTtape III DLTtape IV and Super DLTtape I are all trademarks of Quantum Corporation Other trademarks may be mentioned herein which belong to other companies Preface Chapter 1 Chapter 2 Contents Theory of Operation Enhanced Data Protection OVerview cece ects eeeeeeees SCSI 2 Implementation Philosophy 00 0 0 cece cseeseeeeeeeees Medium Changer Element cccccccssees cesses eecseseessnereseneeeees Medium Transport Element 0 eeeesseseseecseeeeeeeeseseneeeteees POW er Cyclen a E E A DX Series Unit On Line Initialization Failure
79. 46 REQUEST SENSE Command Descriptor Block Data Format eian n ti E E 247 REQUEST SENSE Command Data Field Descriptions 247 REQUEST SENSE Data Format cesses eeeeeeeee 248 REQUEST SENSE Data Field Descriptions 0 ee 249 Supported Sense Keys oo cece cscs ceeeeseeeesenenensnenenenees 252 RESERVE UNIT Command Descriptor Block Data Formatie n Scala Ae a Bake 254 RESERVE UNIT Command Data Field Descriptions 254 REWIND Command Descriptor Block Data Format 257 REWIND Command Data Field Descriptions 0 257 SEND DIAGNOSTIC Command Descriptor Block Datta Format Sristi inre s rsy n ira ei n 258 SEND DIAGNOSTIC Command Data Field Descriptions eneon cates a i s 258 SEND DIAGNOSTIC CDB Bits Selftst DevOfl and UMO e a R EN ERNER 260 SEND DIAGNOSTIC Parameter List Data Format 261 SEND DIAGNOSTIC Parameter List Field Descriptions reisn sh iiss denies cnet eee etl TB aes 262 Sense Keys Used for SEND DIAGNOSTIC cece 264 ASC ASCQ for SEND DIAGNOSTIC eee 264 SPACE Command Descriptor Block Data Format 265 SPACE Command Data Field Descriptions 0 0 0 0 266 Quantum DX Series Software Interface Guide xix Tables XX Table 217 Table 218 Table 219 Table 220 Table 221 Table 222 Table 223 Table 224 Table 225 Table 226 Table 227 Table 228 TEST UNIT READY Command Descriptor Block Data Formater tiee tte eE
80. 48 Move medium command 50 51 command fomat 50 O Operational commands 11 Operational sequences library unit inventory 7 off line 8 on line initialization 6 power on 6 P Parameter settings obtaining mode sense command 39 Parameters specifying mode select command 32 Position to element command 8 52 53 command format 52 R Read element status command 54 69 318 Quantum DX Series Software Interface Guide alternate volume tag info 69 command format 54 data format 58 data transfer element descriptor 67 general structure 57 import export element descriptor 64 medium transport element descriptor 60 primary volume tag info 62 status page format 59 storage element descriptor 62 Release command 71 72 3rd party 71 command format 71 element and reservation id 72 REPORT LUNS command format 245 Request sense command 75 78 command format 75 library events 5 request sense data 76 Request tape cartridge inventory initialize element status command 13 Request volume element address command 79 command format 79 data transfer element descriptor 92 element status page 84 general structure 82 import export element descriptor 90 medium transport element descriptor 85 primary volume tag information 87 storage element description 87 storage element descriptor 87 volume element address header 83 Reserve command 95 98 Rezero unit command 99 S SCSI Commands DATA phase command compo
81. 4h Bit Byte 7 6 5 4 3 2 1 0 0 BOP EOP Reserved BPU 0 Reserved 1 Partition Number 2 3 Reserved MSB 4 7 First Block Location LSB MSB 8 11 Last Block Location LSB 12 Reserved MSB 13 15 Number of Blocks in Buffer LSB MSB 15 19 Number of Bytes in Buffer LSB Quantum DX Series Software Interface Guide 239 Chapter 3 Emulated DLT7000 SCSI Commands Read Position 34h Table 191 READ POSITION Data Field Descriptions 240 Field Name Description BOP Beginning of Partition When set to 1 indicates that the logical unit is at the beginning of partition in the current partition When 0 indicates that the current logical position is not at the beginning of partition Since the tape drive does not support more than one partition the value of this field will be 1 when at BOT EOP End of Partition When set to 1 indicates that the logical unit is positioned between early warning and the end of partition in the current partition When 0 it indicates that the current logical position is not between early warning and end of partition BPU Block Partition Unknown This bit is never set the setting of the Block Type BT bit of READ POSITION CDB does not affect the block address values returned First Block The block address associated with the current Location logical position the next block to be transferred between the target and init
82. 9 Table 110 Table 111 Table 112 Table 113 Table 114 Table 115 Table 116 Table 117 Table 118 Table 119 Table 120 Table 121 Tables LOAD UNLOAD Command Descriptor Block Field Descriptions s c cccissssievsesans tetceaseabensnsssesoersianbeeseasbiseesss 144 LOCATE Command Descriptor Block Data Format 147 LOCATE Command Descriptor Block Field Descriptions seesi nissim 148 LOG SELECT Command Descriptor Block Data Format 149 LOG SELECT Command Descriptor Block Field Descriptions sn niitan e iae 150 LOG SELECT Log Page Header Format eee 153 LOG SELECT Log Page Header Field Descriptions 153 LOG SELECT Log Parameters Format ccccesseeeeneees 154 LOG SELECT Log Parameters Field Descriptions 154 LOG SENSE Command Descriptor Block Data Format 158 LOG SENSE Command Descriptor Block Field Descriptions csi scsssaseseavesisssesssssdestesesssasdssthsaiscelevensdessseaves 159 LOG SENSE Command Descriptor Block eee 160 Supported Pages Page Data Format cee 162 TapeAlert LOG SENSE Header Format 163 TapeAlert LOG SENSE Header Field Descriptions 163 TapeAlert Page Log Parameters Format c cccceeeeeeiees 164 TapeAlert Page Log Parameter Field Descriptions 164 TapeAlert Flags Severity Levels and Meaninggs 165 Read Write Compression Ratio LOG SENSE Header OPM At fected eae cas evegs bedtati es debes
83. 9 for more information Quantum DX Series Software Interface Guide 305 Appendix E DX Series Software Deviations DLT 7000 SCSI Command Deviations 306 Send Diagnostic The DX Series system does not perform any actual diagnostics indicated by the command It will always return a good status for the diagnostics requested See Send Diagnostic 1Dh on page 100 for more information Send Volume Tag The DX Series system returns a check condition unsupported command whereas the ATL P1000 supports this command See Send Volume Tag B6h on page 102 for more information Test Unit Ready Implemented per specification See Test Unit Ready 00h on page 105 for more information Write Buffer The DX Series system returns a check condition unsupported command whereas the ATL P1000 supports this command This section documents where the DX Series system deviates from a normal DLT 7000 tape drive General Information e Tape Cartridge Media Type All DX Series tape cartridges are created of type DLTtape IV e Tape Cartridge Capacity The DX Series tape cartridge capacity will not necessarily match an actual DLTtape IV The user is given the option when creating cartridges to set the capacity depending on his DX system configuration Quantum DX Series Software Interface Guide Appendix E DX Series Software Deviations e Tape Drive Density Setting Block Descriptor Density Code field all density codes are except
84. Ah Data Format 1 Logical Unit Number Rsv d DBD Reserved 2 PC Page Code 3 Reserved 4 Allocation Length 5 Unused Reserved Flag 0 Link 0 The 10 byte MODE SENSE command is required to request the Vendor Unique EEPROM parameter page due to the large amount of data that parameter page contains MODE SENSE 10 can be used to retrieve the other pages as well Note that MODE SENSE 10 returns descriptor data in a different format than MODE SENSE 6 202 Quantum DX Series Software Interface Guide Table 153 MODE SENSE 10 Command Descriptor Block Data Format Table 154 MODE SENSE Control Descriptor Block Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Bit Byte 7 6 5 4 3 2 1 0 Operation Code 5Ah Logical Unit Number Rsv d DBD Reserved Page Code Reserved MSB 7 8 Allocation Length LSB Unused Reserved Field Name Description DBD Disable Block Descriptors If 0 device returns the block descriptor data If set to 1 block descriptor information is not returned PC Page Control The Page Control field indicates the type of page parameter values to be returned to the host PCDescription 00 Report Current Values 01 Report Changeable Values 10 Report Default Values 11 Not supported Quantum DX Series Software Interface Guide 203 Chapter 3
85. Bh Write Buffer 3Bh Table 222 WRITE BUFFER Command Descriptor Block Data Format 274 The WRITE BUFFER command is used with READ BUFFER as a diagnostic function for testing the device data buffer DMA engine SCSI bus interface hardware and SCSI bus integrity It is also used for downloading and updating DLT microcode firmware Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 3Bh 1 Logical Unit Number Reserved Mode 2 Buffer ID 00h MSB 3 5 Buffer Offset LSB MSB 6 8 Parameter List Data Length LSB 9 Unused Reserved Flag 0 Link 0 Tech Tip Read and Write buffer is correctly implemented to the SCSI protocol but the information is not usable Quantum DX Series Software Interface Guide Table 223 WRITE BUFFER Command Data Field Descriptions Write Combined Header and Data Mode 000b Write Data Mode 010b Field Name Mode Chapter 3 Emulated DLT7000 SCSI Commands Write Buffer 3Bh Description The tape drive supports the following values within the field If any other value is set the drive terminates the command with CHECK CONDITION status and an ILLEGAL REQUEST sense key set ModeDescription 000b WRITE combined header and data 010b WRITE data 4k buffer 100b Download Microcode 4k buffer 101b Download Microcode and Save 4k buffer Buffer ID For all of the modes described for th
86. CSI Commands Request Volume Element Address B5h Bit Byte 7 6 5 4 3 2 1 0 48 83 Alternate Volume Tag Information Field omitted if AVolTag 0 84 87 Reserved 00000000h 88 Vendor Unique 0000h 89 Element Address This field indicates the address of the element being reported by that element descriptor Access An access bit value of 1 indicates access to the element by a medium transport element is allowed Except e When the element is in a normal state it is set to 0 e When the element is in an abnormal state it is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields in that element descriptor For the meaning of the codes contained in the two Sense Code fields see Request Sense 03h on page 75 Full e The Full field is set to 1 whenever the element contains a tape cartridge e It is set to 0 otherwise Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to 1 Currently the only valid values for these fields indicate e Element Contents Unknown condition ASC 80 ASCQ 22 e Cleaning Cartridge Installed ASC 30 ASCQ 03 e Any tape drive error ASC 8D or ASC F3 SValid Quantum DX Series Software Interface Guide 93 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h e SValid bit is
87. Capacity LSB Tech Tip Read and Write buffer is currently not implemented Quantum DX Series Software Interface Guide 237 Chapter 3 Emulated DLT7000 SCSI Commands Read Position 34h Read Position 34h Table 188 READ POSITION Command Descriptor Block Data Format Table 189 READ POSITION Command Descriptor Block Field Descriptions 238 The READ POSITION command is used to read a position identifier or SCSI Logical Block Address LBA The LOCATE command uses this identifier to position back to this same logical position in a high performance fashion Bit Byte 7 6 5 4 3 2 1 0 0 Offset Boundaries 34h 1 Logical Unit Number Reserved BT 2 8 Reserved 9 Unused Reserved Flag 0 Link 0 Field Name Description BT Block Type This bit indicates how the position is to be interpreted Since the tape drive uses the same logical block regardless of the setting of this bit the setting is ignored The logical block address values include all recorded objects blocks and filemarks Note The drive returns CHECK CONDITION with UNIT NOT READY sense key with the READ POSITION command if the media is not ready to be accessed Data from READ POSITION takes the following format Quantum DX Series Software Interface Guide Table 190 READ POSITION Data Format Chapter 3 Emulated DLT7000 SCSI Commands Read Position 3
88. Changer SCSI Commands Test Unit Ready 00h 106 Quantum DX Series Software Interface Guide G E Chapter 3 Emulated DLT7000 SCSI Commands mmh T T This chapter describes the SCSI protocol features implemented in the DLT7000 tape system Note that the sections included in this chapter do not fully reiterate every ANSI SCSI message option and or command code specification the sections do describe the supported commands messages options and error recovery procedures Quantum DX Series Software Interface Guide 107 Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Overview of Command and Status Processing The Quantum DLT7000 tape system supports the SCSI commands listed in table 70 The subsection of this chapter that details each of the SCSI commands is listed in the Section column Table 70 Supported SCSI Commands Command Operation Code Erase 19h Inquiry 12h Load Unload 1Bh Locate 2Bh Log Select 4Ch Log Sense 4Dh Mode Select 6 10 15h 55h Mode Sense 6 10 1Ah 5Ah Prevent Allow Medium Removal 1Eh Read 08h Read Block Limits 05h Read Buffer 3Ch Read Position 34h Receive Diagnostics Results 1Ch Release Unit 17h Request Sense 03h Reserve Unit 16h 108 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Command Operation Code
89. Compression Algorithm Description The Compression Algorithm field indicates which compression algorithm the tape drive will use to process data from the initiator when the DCE bit byte 02 bit 7 is set to 1 The only value currently supported for this field is 10h NOTE Specifying a value other than 10h for this field causes the tape drive to return CHECK CONDITION status sense key set to ILLEGAL REQUEST However if EEPROM parameter EnaRepDecomp is set the parameter in this field is ignored and no CHECK CONDITION status is returned Decompression Algorithm The Decompression Algorithm field indicates which decompression algorithm the tape drive will use when decompressing data on the tape The only value currently supported is 10h NOTE Specifying a value other than 10h for this field causes the tape drive to return CHECK CONDITION status sense key set to ILLEGAL REQUEST Tech Tip RLEC is honored Device 2 The Device Configuration Page controls the drive s behavior on the SCSI Configuration bus and allows an initiator to tune bus performance Page 10h Table 145 Device Bit Byte 7 5 4 3 2 1 0 Configuration Page Data Format 0 PS 0 Page Code 10h 1 Additional Page Length OEh 2 Res d CAP O CAF 0 Active Format 0 3 Active Partition 0 190 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Comma
90. DLT7000 SCSI Commands Reserve Unit 16h Reserve Unit 16h Table 204 RESERVE UNIT Command Descriptor Block Data Format Table 205 RESERVE UNIT Command Data Field Descriptions 254 The RESERVE UNIT command reserves the specified tape drive for exclusive use by the requesting initiator or for another specified SCSI device Bit Byte 7 6 5 4 3 2 0 Operation Code 16h 1 Logical Unit Number 3rdPty Third Party Device ID Rsv d 2 4 Reserved 5 Unused Reserved Flag 0 Link 0 Field Name 3rdPty tape drive the CDB Description The third party reservation option for RESERVE UNIT allows an initiator to reserve a logical unit for another SCSI device This option is intended for systems that use COPY and is implemented by the If set to 1 logical unit is reserved for the SCSI device whose ID appears in the Third Party Device ID field The tape drive ignores any attempt made by any other initiator to release the reservation and returns a GOOD status If set to 0 no third party reservation is requested and device is reserved for the initiator that issued Third Party Device ID If 3rdPty is set to 1 indicating that an initiator has reserved the logical unit for another SCSI device this field contains the ID number of that SCSI device for which the reservation was made Quantum DX Series Software Inte
91. DX Series Software Interface Guide Appendix E DX Series Software Deviations See Rewind 01h on page 257 for more information Send Diagnostic The DX Series system does not perform any actual diagnostics indicated by the command It does validate the command but does not validate any of the parameter list data It will always return a good status for the diagnostics requested See Send Diagnostic 1Dh on page 258 for more information Space Implemented per specification Note The DX Series system will perform this operation in less than 5 seconds whereas a DLT 7000 may take much longer See Space 11h on page 265 for more information Quantum DX Series Software Interface Guide 311 Appendix E DX Series Software Deviations Test Unit Ready Implemented per specification See Test Unit Ready 00h on page 268 for more information Verify Implemented per specification See Verify 13h on page 269 for more information Write Implemented per specification See Write QAh on page 271 for more information Write Buffer The DX Series system returns a check condition unsupported command whereas the DLT 7000 supports this command See Write Buffer 3Bh on page 274 for more information Write Filemarks Implemented per specification See Write Filemarks 10h on page 277 for more information 312 Quantum DX Series Software Interface Guide Glossary abort message This SCSI 2 m
92. DX Series Software Interface Guide 231 Chapter 3 Emulated DLT7000 SCSI Commands Read Block Limits 05h Read Block Limits 05h Table 180 READ BLOCK LIMITS Command Descriptor Block Data Format Table 181 READ BLOCK LIMITS Data Data Format 232 The READ BLOCK LIMITS command directs the tape drive to report it s block length limits Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 05h 1 Logical Unit Number Reserved 2 4 Reserved 5 Unused Reserved Flag 0 Link 0 The READ BLOCK LIMITS data shown below is sent during the DATA IN phase of the command The command does not reflect the currently selected block size only the available limits MODE SENSE is the command that returns the current block size Bit Byte 7 6 5 4 3 2 1 0 0 Reserved MSB 1 3 Maximum Block Length LSB MSB 4 5 Minimum Block Length 0002h LSB In SCSI 3 configurations Byte 0 appears as shown below 0 Reserved Granularity Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Read Block Limits 05h The Granularity field is described in the table below Table 182 READ BLOCK LIMITS Data Field Descriptions Field Name Description Granularity This field indicates the supported block size granularity The DLT7000 tape SCSI 3 drive supports all block sizes n such that n minus the minimum block
93. E FILEMARKS command may be used to force the tape drive to write any buffered WRITE data to the tape medium If the tape drive is in buffered mode and WRITE FILEMARKS is received the requested filemarks are appended to the data and the WRITE buffer contents are flushed to tape medium A value of 0 in the Number of Filemarks field indicates that no filemarks are to be written to the tape medium but still flushes any WRITE data to the tape medium If End of Tape EOT is detected while writing filemarks the tape drive finishes writing any buffered data and terminates with CHECK CONDITION status Within the Sense data the End of Medium EOM bit is set the Sense Key field is set to NO SENSE and the Additional Sense Code and Additional Sense Code Qualifier fields are set to EOM P DETECTED The tape drive attempts to complete any subsequent WRITE FILEMARKS returning a CHECK CONDITION status in each case If the tape drive encounters the physical EOM when attempting a WRITE FILEMARKS it returns CHECK CONDITION status Quantum DX Series Software Interface Guide Appendix A sense Key Values E a The following table lists sense key information that can be sent from the media changer or tape drive to the host computer Table 226 Sense Data Values Hexadecimal Sense Key Message Name Description Oh NO SENSE Check the Filemark EOM ILI bits and the Additional Sense Code Additional Sense Code Qualifier bytes 1h RECOVERED ERROR Th
94. ECK CONDITION status is returned sense key set to ILLEGAL REQUEST The drive returns a CHECK CONDITION status with sense key set to ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field with values not supported or changeable In such cases no parameters are changed as a result of the command TB Transfer Block Not supported EER Enable Early Recovery Set to 1 always enabled PER Post Error Default is 0 When set to 1 this bit enables reporting of Check Condition for recovered READ WRITE errors DTE Disable Transfer on Error Must be 0 Not supported DCR Disable ECC Correction Must be 0 Not supported Read Retry Count This field reports the maximum number or rereads that are attempted before declaring an unrecoverable error Write Retry Count This field reports the maximum number of overwrite retries that will be attempted before declaring an unrecoverable error Tech Tip Parameters are accepted but not acted on Quantum DX Series Software Interface Guide Disconnect Reconnect Page 02h Table 139 Disconnect Reconnect Page Data Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h The Disconnect Reconnect Page controls the drive s behavior on the SCSI bus and allows an initiator to tune bus performance Bit Byt
95. END DIAGNOSTIC command directs the tape drive to perform its self diagnostic tests Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 1Dh 1 Logical Unit Number PF 0 Rsv d Selftst DevOfl UnitOfl 2 Reserved MSB 3 4 Parameter list LSB 5 Unused Reserved Flag 0 Link 0 Field Name Description PF Page Format Not supported must be 0 Selftst Self Test This bit is used in conjunction with DevOfl and UnitOfl to specify the type of testing to be done An explanation is provided in the following paragraphs DevOfl Device Offline This bit is used in conjunction with Selftst and UnitOfl to specify the type of testing to be done An explanation is provided in the following paragraphs UnitOfl Unit Offline This bit is used in conjunction with Selftst and DevOfl to specify the type of testing to be done An explanation is provided in the following paragraphs Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1Dh Tech Tip This command will accept any correctly formatted command and return a good status Two levels of unit resident diagnostic tests can be accessed Electronics Self Test Level 1 Test To invoke this level of diagnostic test a major portion of the controller hardware and software must be functioning properly The test is based on the premise that full power up
96. ESERVE UNIT command to a drive that is currently reserved by the requesting initiator If another initiator has previously reserved the logical unit the target returns a RESERVATION CONFLICT status Quantum DX Series Software Interface Guide 255 Chapter 3 Emulated DLT7000 SCSI Commands Reserve Unit 16h 256 If after honoring the reservation any other initiator attempts to perform any command except INQUIRY REQUEST SENSE or RELEASE UNIT the command is rejected with a RESERVATION CONFLICT status That logical unit ignores a RELEASE UNIT command issued by another initiator An initiator that holds a current reservation may modify that reservation for example to switch third parties by issuing another RESERVE UNIT command to the tape drive Medium Changer Considerations for RESERVE UNIT Command The optional Element Reservation feature defined for Medium Change devices as described in the ANSI SCSI 2 specification is not supported The RESERVE command is defined the same as for the tape drive The whole loader unit may be reserved This is separate from a reservation of the tape drive The RESERVE RELEASE commands operate on a LUN basis The Medium Changer and the tape drive are generally handled as different devices In the case of a reserved drive LUN a MOVE MEDIUM command issued to the Medium Changer LUN cannot insert or remove a tape cartridge to or from a tape drive unless the tape drive is reserved by the same initia
97. GAL REQUEST Speed Block Descriptor Length The tape drive supports only its default speed This field specifies the length in bytes of all the block descriptors Since the drive only allows one block description the value must be either 0 or 8 A value of 0 indicates no block description is included a value of 8 indicates a block descriptor is present and precedes the mode page data Any other value other than 0 or 8 causes a CHECK CONDITION status with sense key of ILLEGAL REQUEST to be returned Quantum DX Series Software Interface Guide 177 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 133 MODE SELECT Mode Parameter Block Descriptor Data Format Table 134 MODE SELECT Mode Parameter Block Descriptor Field Descriptions 178 Mode Parameter Block Descriptor The figure and table that follow provide an illustration and description of the fields that make up the MODE SELECT command s Mode Parameter Block Descriptor Bit Byte 7 6 5 4 3 2 1 0 0 Density Code MSB 1 3 Number of Blocks LSB 4 Reserved MSB 5 Block Length LSB Field Name Description Density This field should match the current tape medium Code density it is set to 0 if the density is unknown 00h Use default density OAh 6667 bpi MFM serial cartridge tape X3B5 86 199 read only 16h 10000 bpi MFM serial cartridge tape X3 193 1990
98. Hosea N i AE 166 Read Write Compression Ratio LOG SENSE Header Field Descriptions sisene tated Mave engesoiets 167 Log Parameters Format for Read Write Compression Ratio LOG SENSE Page Parameter Codes 00h and O1h 167 Log Parameters for Read Write Compression Ratio LOG SENSE Page Field Descriptions Parameter Codes 00h and Oljoro E a nouns Seen wa nteie 168 Quantum DX Series Software Interface Guide XV Tables xvi Table 122 Table 123 Table 124 Table 125 Table 126 Table 127 Table 128 Table 129 Table 130 Table 131 Table 132 Table 133 Table 134 Table 135 Table 136 Table 137 Table 138 Table 139 Table 140 Table 141 Table 142 Log Parameters Format for Read Write Compression Ratio LOG SENSE Page Parameter Codes 02h through O9h 169 Log Parameters for Read Write Compression Ratio LOG SENSE Page Field Descriptions Parameter Codes 02h throug KOIR er in a NE A as 170 Mode Select 6 Command Descriptor Block Data F rmate aere en ta a aonni a as EE EIEEE ESTNE Eis 173 Mode Select 10 Command Descriptor Block Data Formate eneas aa n E iSS 173 MODE SELECT 6 10 Command Descriptor Block Field Descriptions neier iosian ies 174 MODE SELECT 6 Mode Parameter List Data Format 174 MODE SELECT 10 Mode Parameter List Data Format 174 MODE SELECT Mode Parameter List Field Descriptions ons morire aen ea ains 175 MODE SELECT 6 Mode Parameter Heade
99. I Commands Log Sense 4Dh Table 117 TapeAlert Flags Severity Levels and Meanings Flag Severity Level Meaning 1 Read Warning Warning Problems reading data There is no loss of data but the tape drive s performance is reduced 2 Write Warning Problems writing data There is no loss of data but the Warning capacity of the tape is reduced 3 Hard Error Warning An error has occurred during a read or write operation that the tape drive cannot correct operation has stopped 5 Read Failure Critical The tape medium or the tape drive is damaged Contact a service representative 6 Write Failure Critical The tape medium is faulty or the tape drive is damaged Test the tape drive using a known good tape cartridge If the problem persists contact a service representative 9 Write Protect Critical The tape cartridge is write protected Set the write protection switch to enable writing or use a different tape cartridge 10 No Removal Informational The tape drive is busy and the tape cartridge cannot be ejected Wait for the operation to complete before attempting to eject the tape cartridge 11 Cleaning Informational The tape cartridge in the tape drive is a cleaning Media cartridge For normal tape drive data related operations replace the cleaning cartridge with a data tape cartridge 20 Clean Now Critical The tape drive needs to be cleaned Make sure that all tape operations have completed eject the
100. INITIATOR DETECTED ERROR Initiator Detected Error Message was received from the host 4E 00 OVERLAPPED COMMANDS ATTEMPTED Due to a second command being sent from the same host before a previous command has completed the previous command has been aborted This may also occur when executing off line commands via the control panel and DIAG port simultaneously 53 02 MEDIUM REMOVAL PREVENTED Prevent Medium Removal command was executed and command was received to export cartridge Execute Allow Medium Removal command and retry move medium command Quantum DX Series Software Interface Guide 285 Appendix B Media Changer Sense Code Values ASC 54 ASCQ 00 Message Name Description SCSI TO HOST SYSTEM INTERFACE FAILURE Possible SCSI bus time out or premature disconnect Check cable connections and cable length 80 00 DOOR WAS OPENED INVENTORY MAY HAVE BEEN CORRUPTED Close door and retry command 80 01 TRANSFER FULL COMMAND CAN NOT BE EXECUTED Gripper has cartridge in it Move cartridge to empty storage element using Move Medium command Retry command 80 06 TRANSFER EMPTY COMMAND ABORTED Gripper does not contain cartridge at end of pick portion of Move Medium command 80 08 LOGICAL UNIT TURNED ON LINE The DX Series system is ready to communicate with the host computer 80 09 LOGICAL UNIT IS TURNED OFF LINE The DX Series syst
101. Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Log Sense 4Dh Parameter Size Code Description bytes 8023 Reserved 4 8024 Reserved 4 8025 Reserved 4 8026 Reserved 4 8030 Reserved 4 8031 Reserved 4 8032 Reserved 4 8033 Reserved 4 8035 Reserved 4 8036 Reserved 4 8040 Reserved 4 8041 Reserved 4 8042 Reserved 4 8043 Reserved 4 8044 Reserved 4 8045 Reserved 4 8050 Reserved 4 8051 Reserved 4 8052 Reserved 4 Quantum DX Series Software Interface Guide 31 Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h Mode Select 15h The Mode Select command provides a means for the host to specify parameters to the DX Series system The DX Series system supports Element Address Assignment Page 1Dh e Vendor Unique Page 20h Vendor Unique Page 00h Table 25 Mode Bit Byte 7 6 5 4 3 2 1 0 Select Command 0 Operation Code 15h 1 Logical Unit Number PF 1 Reserved 0 SP 2 Reserved 0000h 3 4 Parameter List Length 5 Reserved 00h e Logical Unit Number The Logical Unit Number field must be set to 0 This field indicates the logical unit to which the command is sent e SP Save Page e When set to 0 the Save Page field performs mode select without saving e When set to 1 Save Page performs Mode Select and saves it in nonvolatile memory PF When set to 1 t
102. Length MSB 4 n Page Length LSB Table 114 TapeAlert LOG SENSE Header Field Descriptions Field Name Description Page Code The Page Code echoes the page code that was specified in the LOG SENSE command descriptor block Page Length The Page Length field specifies the total number of bytes contained in this log page not including the four bytes that make up the header Quantum DX Series Software Interface Guide 163 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Table 115 TapeAlert Page Log Parameters Format Table 116 TapeAlert Page Log Parameter Field Descriptions Bit Byte 7 6 5 4 3 2 1 0 MSB g 19 Parameter Code n LSB 5n 1 DU DS TSD ETC TMC Rsv d LP 5n 2 Parameter Length 1 Baa Value of TapeAlert Flag Flag is set when Bit 0 1 Bits 1 7 are Reserved Field Name Description Page Code This field contains the Flag code Page Length This field is set to 1 Value of Tape If Bit 0 is set to 1 this indicates that TapeAlert has sensed a problem See Alert Flag Table 5 26 for the supported Flags and their definitions If Bit 0 is 0 the Flag is not set and no problem has been sensed 164 For definitions of bits that make up the Control Byte the byte 5n 1 above refer to Read Error Counter Page Page 03h on page 162 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCS
103. M and DRAM to be transferred over the SCSI bus Buffers 1 and 2 provide a diagnostic capability for the system s firmware Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 3Ch 1 Logical Unit Number Reserved Mode 2 Buffer ID MSB 3 5 Buffer Offset LSB MSB 6 8 Allocation Length LSB 9 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Read Buffer 3Ch Table 184 READ BUFFER Command Descriptor Block Field Descriptions Field Name Description Mode The tape drive supports the following values within this field If any non supported value is set the drive terminates the command with a CHECK CONDITION status ILLEGAL REQUEST sense key set ModeDescription 000b Combined Header and Data 010b Data 011b Descriptor Buffer ID Must be 0 1 or 2 Buffer 0 This buffer is intended to be used in conjunction with the WRITE BUFFER command to provide a diagnostic capability for testing the SCSI bus and or hardware integrity Buffer 1 Choosing Buffer 1 results in the tape system transferring the contents of SCSI RAM and EEPROM over the SCSI bus For DLT7000 tape systems a total of 264K is transferred 4K for RAM Buffer 2 Choosing Buffer 2 results in the tape system transferring the contents of cache RAM over the SCSI bus For DLT7000 tape systems a total of either 4 or 8 MB is transferred
104. No Bar Code Labels value of 1 specifies the inventory to not scan the bar codes of the elements and set the corresponding primary volume tags to empty e A value of 0 specifies element bar code labels are to be scanned and placed in the primary volume tags Quantum DX Series Software Interface Guide 15 Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Inquiry 12h Inquiry Command Data Format Table 9 Inquiry Command Data Format The host uses the Inquiry command to determine devices attached to the SCSI bus and request a description from each device The description provided by the DX Series system identifies the device type manufacturer and nature of the SCSI interface The format for this command data block is shown in table 9 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 12h 1 Logical Unit Number Reserved 0h EVPD 2 Page Code 3 Reserved 00h 4 Allocation Length 5 Reserved 00h Logical Unit Number The Logical Unit Number must be set to 0 Field indicates the logical unit to which the command is sent e EVPD e When the Enable Vital Product Data EVPD bit is set to 0 only Standard Inquiry Data is returned e When the bit is set to 1 the target returns the optional vital product data specified by Page Code field see table 11 e Allocation Length Field contains the maximum data amount that the DX Series system may return Quantum
105. Not supported Any value is ignored Time Limit Maximum This value specifies the maximum amount of data Burst Size that will be transferred without disconnecting A value of 0 sets no limit Any value is in units of 512 bytes For example a value of 8 represents 4 Kbytes Values that are not multiples of 8 are rounded up to the closest multiple of 8 184 Quantum DX Series Software Interface Guide Control Mode Page 0Ah Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description DTDC Data Transfer Disconnect Control This field defines further restrictions for when disconnect is permitted 00b Data transfer disconnect control is not used Disconnect is controlled by the other fields in this page 01b Once the data transfer of a command has been started a target does not attempt to disconnect until all the data to be transferred has been transferred 10b Reserved 11b Once the data transfer of a command has started a target does not attempt to disconnect until the command is complete If DTDC is a non zero value and the maximum burst size is non zero the tape drive returns CHECK CONDITION status sense key set to ILLEGAL REQUEST and additional sense code set to ILLEGAL FIELD IN PARAMETER LIST Tech Tip Parameter values and flags are accepted but not acted on The Control Mode Page provides control over several features such as ta
106. Number Page 80h Data Format 0 Peripheral Qualifier Peripheral Device Type 1 Page Code 80h 2 Reserved 3 Page Length OAh 4 Serial Number Quantum DX Series Software Interface Guide 133 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Table 87 Unit Serial Field Name Description Number Page Field Descriptions Serial Number The serial number given is the serial number of the module or the drive typically starting with CX indicating the site of manufacture If the drive serial number is valid then it is reported otherwise the module serial number is reported The serial number can be found on the bar code label The serial number is returned in ASCII Table 88 Device a Identification VPD Bit Byte 7 6 5 A 3 2 1 0 Page 83h 0 Peripheral Qualifier 0 Peripheral Device Type 1 1 Page Code 83h 2 Reserved 00h 3 Page Length n 3 Identification Descriptor list 4 Identification descriptor first Identification descriptor last n e Identification Descriptor 134 Quantum DX Series Software Interface Guide Table 89 Identification Descriptor Table 90 Code Set Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Each identification descriptor see table 89 contains information identifying the logical unit physical device or access path used by the command and returned parameter data The association field i
107. OD oo eeeesesseceesecteeetesseseeeseeeees 276 Download Microcode and Save Mode 101D eee eee eeeeeeneeeees 276 Write Filemarks LON scesssscssessesenseerseceseeseesoesessssesseessecensersesenssan arenes 277 Sense Key Values 279 Media Changer Sense Code Values 281 DLT7000 Sense Code Values 289 Fibre Channel Topology 297 Fibre Channel Topology sesciscescusstsssssssssersendeensansepseestscodoseestuchanevestensenenee 297 Fibre Channel Addressing 0 c cc escsssssesesesesesesesesesesesesesesenesesesesens 298 DX Series Software Deviations 301 Media Changer SCSI Command Deviations cece eee 301 DLT 7000 SCSI Command Deviations eseeeseseeeeeeeeeeeeeeeeees 306 313 Quantum DX Series Software Interface Guide Index 317 Quantum DX Series Software Interface Guide vii viii Quantum DX Series Software Interface Guide D y Figures T Figure1 Read Element Status Data General Structure 57 Figure2 Request Volume Element Address Data cccscsssseeees 82 Figure3 Fibre Channel Topologies cccccessessssesesesessseeteseseseeseseeees 298 Quantum DX Series Software Interface Guide ix Figures x Quantum DX Series Software Interface Guide Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Tables DX30 Storage Elements 0 ccc eceeeeeeeceeeeseeceeeneneteteeeenes 3 DX100 Storage Elements
108. Page Length 06h 2 Maximum Additional Partitions 0 3 Additional Partitions Defined 0 4 FDP 0 SDP 0 IDP 0 PSUM 0 Reserved 5 Medium Format Recognition 01h 6 7 Reserved 222 Quantum DX Series Software Interface Guide Table 173 Medium Partition Page Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name Description PS Parameters Savable Not supported must be 0 Additional This field indicates the number of bytes in the page Page Length Note that this value does not include bytes 0 and 1 The length is returned on MODE SENSE and must subsequently be set to the same value when performing MODE SELECT Maximum Not supported Must be 0 Additional Partitions Additional This field specifies the number of additional Partitions partitions to be defined for the tape based on the Defined settings of the SDP and IDP bits The maximum allowed is the value returned in the Maximum Additional Partitions field Since only one partition is supported this field must be 0 FDP Fixed Data Partitions Must be 0 SDP Select Data Partitions Must be 0 IDP Initiator Defined Patrons Must be 0 PSUM Partition Size Unit of Measure Must be 0 Medium Set to 01h indicating that automatic format Format recognition is supported Recognition TapeAlert Page 1Ch The TapeAlert configuration settings can be read via the MODE SENSE
109. Parameter Code Description 00h READ Compression Ratio x 100 01h WRITE Compression Ration x 100 DU Disable Update Always 0 DS Disable Save Not supported This bit always set to 1 TSD Target Save Disable Not supported This bit always set to 1 ETC Enable Threshold Comparison Threshold checking is not supported on this page Always set to 0 TMC Threshold Met Criteria Always 0 LP List Parameter Always set to 0 parameter codes treated as data counter 168 Quantum DX Series Software Interface Guide Table 122 Log Parameters Format for Read Write Compression Ratio LOG SENSE Page Parameter Codes 02h through 09h Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Bit Byte 7 6 5 4 3 2 1 0 MSB 0 1 Parameter Code LSB 2 DU 0 DS 1 TDM ETC TMC 0 Rsv d LP 0 3 04h MSB 4 Counter Value LSB Quantum DX Series Software Interface Guide 169 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Table 123 Log Parameters for Read Write Compression Ratio LOG SENSE Page Field Descriptions Parameter Codes 02h through 09h Field Name Description Parameter Code Parameter Codes supported for the READ WRITE COMPRESSION RATIO page codes 02h through 09h are as follows Parameter Code Descriptions 02h Mbytes Transferred to Host 03h Bytes Transferred to Host 04h Mbytes Read from Tape 05h Bytes Read f
110. Peripheral Qualifier Peripheral Device Type 1 Page Code COh 2 Reserved 00h 3 Page Length 20h 4 5 Servo Firmware Checksum 6 7 Servo EEPROM Checksum 8 11 Read Write Firmware Checksum 12 35 Read Write Firmware Build Data Field Name Description Checksum Servo Firmware Servo EEPROM and READ WRITE Firmware checksums are given as binary numbers and are for positive firmware and EEPROM identification Firmware Build Date Firmware Build Date is an ASCII string in the DD MMM YYYY HH MM SS format Bit Byte 7 6 5 4 3 2 1 0 0 Peripheral Qualifier Peripheral Device Type 1 Page Code C1h 2 Reserved 3 Page Length 14h Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Bit Byte 6 5 4 3 2 1 0 4 Product Family 7 Released Firmware 5 Firmware Major Version 6 Firmware Minor Version 7 EEPROM Format Major Version 8 EEPROM Format Minor Version 9 Firmware Personality 10 Firmware Sub Personality 11 Vendor Unique Subtype 12 Controller Hardware Version 13 Drive EEPROM Version 14 Drive Hardware Version 15 Media Loader Firmware Version 16 Media Loader Hardware Version 17 Media Loader Mechanical Version 18 Media Loader Present Flag 19 Library Present Flag 20 23 Module Revision Quantum DX Series Software Interface Guide 139
111. Primary Volume Tag Information If the Volume Tag information was requested in the command block VolTag 1 the Primary Volume Tag Information field is included in the element descriptor This field contains the information read from the tape cartridge bar code label its format is shown in table 43 Quantum DX Series Software Interface Guide 61 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Table 43 Primary Bit Byte 7 6 5 4 3 2 1 0 Volume Tag Information 12 43 Volume Identification Field 44 Reserved 0000h 45 46 Volume Sequence Number 0000h 47 Volume Identification Field A left justified sequence of ASCII characters representing the bar code scanned from the cartridge followed by blanks 20h e Volume Sequence Number This field is reserved and set to 0 Table 44 Storage Bit Byte 7 6 5 4 3 2 1 0 Element Descriptor 0 MSB Element Address 1 LSB 2 Reserved 0h Access Except oe Full 3 Reserved 00h 4 Additional Sense Code 5 Additional Sense Code Qualifier 6 7 Reserved 000000h 8 9 Svalid sa Reserved 00h 62 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Bit Byte 7 6 5 4 3 2 1 0 10 Source Storage Element Address 11 12 47
112. Reserved Servo Firmware Checksum Field Name Immed Unused Reserved Description Immediate If this bit is set to 1 status is returned as soon as the operation is started If set to 0 status is returned after the operation has completed Tech Tip The immed bit is accepted but ignored in processing Re Ten Re tension Re tension operations are not needed on the tape drive This bit is ignored i e good status if bit is set to 1 Quantum DX Series Software Interface Guide Field Name Load Chapter 3 Emulated DLT7000 SCSI Commands Load Unload 1Bh Description Load When a cartridge is inserted the tape medium is automatically loaded and positioned by the drive at Beginning of Medium BOM Logically the drive is positioned at the beginning of Partition 0 If the Load bit is set to 1 and the medium is already loaded no action is taken A good status is returned If the medium was unloaded but the cartridge was not removed a Load command causes the tape to be loaded to Beginning of Partition BOP again and made ready If the Load bit is set to 0 and the medium is loaded the drive writes any buffered data and filemarks to the tape and then rewinds the tape to BOM and unloads the medium back into the cartridge The green Operate Handle indicator on the tape drive s faceplate illuminates and the cartridge can be removed from the tape drive If t
113. Rewind olh Send DiagnostiC 1Dh Space 11H Test Unit Ready 00h Verify 13H Write OAh Write Buffer 3bH Write Filemarks 10h Note Relative Addressing is not supported by the tape drive Therefore in all I O commands the RelAdr bit must be 0 RESERVE UNIT and RELEASE UNIT by Logical Unit Number are supported as are third party reservations Extent reservations are not supported The RECEIVE DIAGNOSTIC RESULTS and SEND DIAGNOSTIC DATA commands implement vendor unique pages to test the drive during the manufacturing process It is recommended that initiators specify only the non page format variants of these commands PF 0 except for page 0x40 The DLT tape drive does not act as an initiator on the SCSI bus Therefore the drive will not 1 generate unsolicited interrupts to the host 2 initiate its own SCSI commands or 3 assert bus reset Linked commands are supported Untagged queuing is supported SCSI Pointers SCSI architecture provides a set of three pointers called saved pointers for each I O process The three pointers are Command Status and Data When an I O process becomes active the three saved pointers are copied Quantum DX Series Software Interface Guide 109 Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Reset Sequence Table 71 Command Descriptor Block Fields 110 to the initiator as current pointers There is only one set of current pointers
114. SB 2 DU 0 DS 0 TSD O ETC 0 TMC 0 Rsv 0 LP 0 3 Parameter Length 04h MSB 4 7 Parameter Value LSB Parameter Code Parameter Code field identifies which log parameter is being transferred for that log page For parameter codes see table 24 DU Disable Update Not supported always 0 DS Disable Save Not supported always 0 TSD Target Save Disable Not supported always 0 Quantum DX Series Software Interface Guide 29 Chapter 2 Emulated Medium Changer SCSI Commands Log Sense 4Dh Table 24 Supported Log Parameter Codes for 30h Page 30 ETC Enable Threshold Comparison Not supported always 0 TMC Threshold Met Criteria Not supported always 0 LP List Parameter Not supported always 0 Parameter Length All log parameter values supported in the Medium Changer Statistics page have a length of 4 bytes Parameter Value The cumulative count of parameter as described in table 24 Parameter Size Code Description bytes 8000 Number of seconds system has been 4 powered on 8001 Reserved 4 8010 Number of attempted moves from a bin 4 8011 Number of attempted moves to a bin 4 8012 Number of attempted moves from a drive 4 8013 Number of attempted moves to a drive 4 8014 Number of attempted moves from load port 4 8015 Number of attempted moves to load port 4 8020 Reserved 4 8021 Reserved 4 8022 Reserved 4 Quantum DX Series Software
115. SENSE and must subsequently be set to the same value when performing MODE SELECT CAP Change Active Partition Not supported CAF Change Active Format Not supported Active Not supported Format Active This field indicates the current logical partition Partition number in use Only partition 0 is supported WRITE Indicates how full the buffer should be before Buffer Full restarting writing to the medium The tape drive Ratio sets this to 0 unused since it uses an automatic adaptive mechanism to dynamically adjust its ratio according to the average data rates over the SCSI bus READ Buffer Indicates how empty the buffer should be before Empty Ratio restarting reading from the medium The tape drive sets this to 0 unused since it uses an automatic adaptive mechanism to dynamically adjust its ratio according to the average data rates over the SCSI bus 220 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name Description WRITE Indicates the maximum time in 100 ms increments Delay Time the drive waits with a partially fully buffer before forcing the data to tape Note that the buffer full empty ratio which is dynamic can cause data to be written sooner than the WRITE delay time value indicates The WRITE delay time defaults to 200 ms C8h This causes the buffer to be flushed in 20 seconds Minimum value is 15 Fh
116. Select 6 10 15h 55h TapeAlert Page 1Ch Table 149 TapeAlert Page Format Descriptor Data Format 196 Field Name Description Additional Must be 0 This field specifies the number of Partitions additional partitions to be defined for the tape Defined based on the settings of the SDP and IDP bits The maximum allowed is the value returned in the Maximum Additional Partitions field Only one partition is supported therefore the value of the field must be 0 FDP Fixed Data Partitions Must be 0 SDP Select Data Partitions Must be 0 IDP Initiator Defined Partitions Must be 0 PSUM Partition Size Unit of Measure Must be 0 Medium This field is valid for MODE SENSE only and is set Format to 01h indicating that Medium Format Recognition Recognition is supported The drive supports the TapeAlert Page that is used to set change the supported TapeAlert configuration options use the MODE SENSE command to read the settings of the TapeAlert page Bit Byte 7 6 5 3 2 1 0 0 PS 0 0 Page Code 1Ch 1 Additional Page Length 0A 2 Perf Reserved DExcpt Test Rsvd LogErr Quantum DX Series Software Interface Guide Table 150 TapeAlert Page Format Descriptor Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Bit Byte 7 6 5 4 3 2 1 0 3 Re
117. Select 6 10 Block Descriptor Density Code field all density codes are excepted Only density codes 80h 85h may effect the compression setting Data Compression Page field DCE It is preferred to use the Data Compression Page field DCE to enable or disable compression Actual compression of data is supported in some variants of DX systems Disconnect Reconnect Page 02h fields Maximum Burst Size and DTDC may be changed but have no effect on the tape drive emulation operation Control Mode Page OAh field RLEC may be changed but has no effect on the tape drive emulation operation Device Configuration Page 10h fields SEW Write Delay Time and Select Data Compression Algorithm may be changed but have no effect on the tape drive emulation operation Tape Alert Page 1Ch fields Perf Dexter Test and MRIE may be changed but have no effect on tape drive emulation operation EEPROM Vendor Unique Page 3Eh is not supported See Mode Select 6 10 15h 55h on page 172 for more information Quantum DX Series Software Interface Guide Appendix E DX Series Software Deviations Mode Sense 6 10 EEPROM Vendor Unique Page 3Eh is not supported See Mode Sense 6 10 1Ah 5Ah on page 202 for more information Prevent Allow Medium Removal Implemented per specification See Prevent Allow Medium Removal 1Eh on page 227 for more information Read Implemented per specification See Read 08h on page 229 for mo
118. Software Interface Guide 179 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description Number of This MODE SENSE field is sent 0 indicating that Blocks all of the remaining logical blocks on the tape will have the medium characteristics specified by the block descriptor Block This field specifies the length in bytes of each Length logical block transferred over the SCSI bus A block length of 0 indicates that the length is variable specified in the I O command Any value other than 0 indicates the number of bytes per block to use for READ WRITE and VERIFY commands that specify a fixed bit of 1 i e fixed block mode which also causes the transfer length in the command descriptor block to be defined as a block count If fixed bit is not equal to 1 this field is ignored Mode Page Descriptors Following the MODE SELECT command s Mode Parameter Block Descriptor are the MODE SELECT pages each of which sets a different device parameter Each mode page has a 2 byte header that identifies the page code and indicates the number of bytes in that page Table 135 MODE SELECT Page Descriptor Data Format Page Code Additional Page Length 180 Quantum DX Series Software Interface Guide Table 136 MODE SELECT Page Descriptor Field Descriptions READ WRITE Error Recovery Page 01h Table 137 Error Recovery Page D
119. Storage Element Address The Source Storage Element Address represents the address of the last storage element that held the cartridge The SValid field indicates whether or not this information is valid Primary Volume Tag Information If the Volume Tag information was requested in the command block the Primary Volume Tag Information field is included in the element descriptor For format see table 57 The layout of an element descriptor for an element of the Import Export element type is illustrated in table 60 Quantum DX Series Software Interface Guide 89 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Table 60 Import Bit Byte 7 6 5 4 3 2 1 0 Export Element Descriptor 0 MSB Element Address 1 LSB Import Export Import 2 Reserved 0 Enable Enable Access Except Export Full 3 Reserved 00h 4 Additional Sense Code 5 Additional Sense Code Qualifier 6 7 Reserved 000000h 8 9 SValid or Reserved 00h 10 Source Storage Element Address 11 12 47 Primary Volume Tag Information if present 48 51 Reserved 00000000h 52 Vendor Unique 0000h 53 Import Element e A1inthe Import Enable field indicates the element can import a tape cartridge into the DX Series system e Oindicates the element cannot import a cartridge e This field is always set to 1 90 Quantu
120. Supported Vital Product Data Page oo eee eeceneeeeeeeneneneneees 132 Load Unload 1Bh i 02 4 c3 sath ancien dinnivn sina EE EEES 142 Locate QBN ioiii reie iei E E EEEE EEEE RS 147 Log Select ACH sresscscs scones ctsss iaeiei ieee i ei 149 Quantum DX Series Software Interface Guide Log Detection Summary in LOG SELECT Command Descriptor Block assier eneee E E 152 Operation of LOG SELECT sessesesesesresreiserersiserresteditesresteiesterrrrereerees 152 Log Select Page Format s cicstscssssscscstsesssscscssssssseseseseadsosasecssesosecosssszosessese 153 Error Detection Summary in LOG SELECT Pages ccceseeeeeeees 157 Log Sense ADA si eesin nesa aiii ias 158 Error Detection Summary in LOG SENSE Command Descriptor Blocks reene apesi piser er t sesia orrea E eee EESE EREA 161 Supported Pages Log Page Page 00h ss ss ssssssssssssssissessrssresieseesressess 162 Read Error Counter Page Page 03h ss ss sssssississssssssississrsrresresreressness 162 Last n Error Events Page 07 ss ss sssssssssssiesrsssisrssresresresressessenreeress 162 TapeAlert Page 2EN uiris iienaa nesik 162 Read Write Compression Page 32h ses sssssssssesissessesreesiresressees 166 Device Wellness Page 33h sssiissssirseianiaseeiiniria 171 Device Status Page SEN ccc ccc eee eseeceeeceeenseesesessseneteneeeeeeees 171 Mode Select 6 10 15h 55h wesc cesesesesesesrsneeseeeesessseneansnsneeeeees 172 Mode Parameter Lists csciissssses
121. Test Failed Bad Drive Status 40h 83h Level 1 Test Failed Loader Reset Failed 264 Quantum DX Series Software Interface Guide Space 11h Table 215 SPACE Command Descriptor Block Data Format Chapter 3 Emulated DLT7000 SCSI Commands Space 11h The SPACE command provides a variety of positioning functions that are determined by Code and Count fields in the Command Descriptor Block Both forward toward End of Medium End of Partition and reverse toward Beginning of Medium Beginning of Partition positioning are provided Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 11h 1 Logical Unit Number Reserved Code MSB 2 4 Count LSB 5 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide 265 Chapter 3 Emulated DLT7000 SCSI Commands Space 11h Table 216 SPACE Command Data Field Descriptions Field Name Description Code The code can be one of the following Space CodeSpace by 000b Blocks 001b Filemarks 010b Sequential Filemarks 011b End of Data For 2 6 GB and 6 0 GB format the tape drive supports count values 0 1 and 2 only For 10 0 GB and newer formats compressed or noncompressed the count value can be from 0 to FFFFFFh Count When spacing over blocks or marks the Count field is interpreted as follows A positive value N causes forward motion over N blocks or marks The tape is logically positioned after t
122. abled When set to 0 automatic drive cleaning is disabled This bit is ignored It can be set to 0 or 1 for compatibility with hosts Note The normal state of automatic drive cleaning is disabled Quantum DX Series Software Interface Guide 33 Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h Table 27 Mode Select Data Vendor Unique Page 00h 34 ADU Auto Drive Unload e When this bit is set to 1 the DX Series system unloads a tape drive as part of the Move Medium command default condition e When set to 0 the auto drive unload feature is disabled EXB Exabyte Emulation e When this bit is set to 1 the DX Series system emulates an Exabyte EXB 120 this setting changes the SCSI command set s behavior e When set to 0 the DX Series system SCSI interface operates in the default manner as described in this document The format for Mode Select Vendor Unique Page 00h is shown in table 27 Bit Byte 7 6 5 4 3 2 1 0 0 o a Page Code 00h 1 Page Length 3Eh 2 Alnit UInit 0 Parity 0 NBL Rsrvd 0 oy a 3 Maximum Parity Retries 00h 4 63 Display Messages 00h PS Parameters Savable This bit is only used with the Mode Sense command see table 32 This bit is reserved for Mode Select command and should be set to 0 Alnit e When set to 1 the DX Series system ensures that all elements have been inventoried b
123. age 0Ah Control Mode Page OFh Data Compression Page 10h Device Configuration Page 11h Medium Partition Page 1Ch Tape Alert Page 3Eh EEPROM Vendor Unique Page Tech Tip All page information is accepted but not acted on with the exception of the RLEC bit and block length in the DX Series system Continued on next page Quantum DX Series Software Interface Guide Table 124 Mode Select 6 Command Descriptor Block Data Format Table 125 Mode Select 10 Command Descriptor Block Data Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h The tape drive always powers up with its default configurations set This is also true if the drive receives a BUS DEVICE RESET message or a hard reset via the RST line on the SCSI bus The Command Descriptor Block is illustrated in table 124 Note For a list of changeable parameters within MODE SELECT refer to EEPROM Vendor Unique Page 3Eh and Changeable Parameters within MODE SELECT Bit Byte 0 Operation Code 15h 1 Logical Unit Number PF Reserved SP 0 Reserved Parameter List Length Unused 00 Reserved Flag 0 Link 0 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 55h 1 Logical Unit Number PF Reserved SP 0 2 6 Reserved 7 8 Parameter List Length 9 Unused 00 Reserved Flag 0 Link 0
124. age codes 2 3 and 32 are set to 0 and all threshold values are set to default If PCR is set to 1 and the parameter list length is set to a non zero value the command terminates with a CHECK CONDITION status with sense key of ILLEGAL REQUEST and an Additional Sense Code ASC of INVALID FIELD IN CDB SELECT Command Field Name Descriptor Block Field Descriptions PCR SP Save Page Not supported must be set to 0 If for some reason the Save Page bit is set the command terminates with a CHECK CONDITION status with a sense key of ILLEGAL REQUEST and an ASC of INVALID FIELD IN CDB 150 Quantum DX Series Software Interface Guide Field Name PC Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Description Page Control This field defines the type of parameter values to be selected PC Type of Parameter Values 00b Current Threshold Values 01b Current Cumulative Values 10b Default Threshold Values 11b Default Cumulative Values All of these types of values are changeable using LOG SELECT When the PC field is set to 00b or 01b and the Parameter List Length is set to 0 the command terminates with a CHECK CONDITION status Sense Key of ILLEGAL REQUEST and ASC of INVALID FIELD IN CDB This occurs because modification of Current Threshold Values and Current Cumulative Values is not supported When the PC field is set to 10b and the Parameter List Length field is set to 10b then all Current
125. alize Element Status with Range E7h Vendor Inquiry 12h Mandatory Log Sense 4Dh Optional Mode Select 15h Optional Mode Sense 1Ah Optional Move Medium A5h Mandatory Position to Element 2Bh Optional Prevent Allow Medium Removal 1Eh Optional Read Element Status B8h Optional Read Buffer 3Ch Optional Release 17h Optional Request Sense 03h Mandatory Request Volume Element Address B5h Optional Reserve 16h Optional Rezero Unit olh Optional Send Diagnostic 1Dh Mandatory Send Volume Tag B6h Optional Quantum DX Series Software Interface Guide 11 Chapter 2 Emulated Medium Changer SCSI Commands Supported Operational Commands Command Name OperCode Type Test Unit Ready 00h Mandatory Write Buffer 3Bh Optional 12 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Initialize Element Status 07h Initialize Element Status 07h Table 7 Initialize Element Status Command This command allows the host to request an inventory of the tape cartridges held in a DX Series system The inventory reads each tape s bar code Inventory information is returned to the host only if requested using the Read Element Status command The DX Series system does not accept any other commands from the host during the inventory process The host can issue an Abort of the inventory for the DX Series system If another Initialize Element Status command is then issued the inventory process is restart
126. and the lower byte will simply be the NL_Port s AL_PA But there still needs to be a way of uniquely identifying a port even for much of the above initialization to take place This is accomplished using Name_Identifiers a fixed 64 bit value Name_Identifiers are used to uniquely identify nodes Node_Name a Port Port_Name and a Fabric Fabric_Name Name Identifiers are not used to route frames but are used in mapping to upper layer protocols Quantum DX Series Software Interface Guide 299 Appendix D Fibre Channel Topology 300 Quantum DX Series Software Interface Guide Media Changer SCSI Command Deviations G Appendix E DX Series Software Deviations The DX Series system emulates an ATL P1000 library media changer and a DLT 7000 tape drive This section documents the software deviations in both the media changer ATL P1000 and the DLT 7000 tape drive SCSI command sets e Media Changer SCSI Command Deviations e DLT 7000 SCSI Command Deviations This section documents where the DX Series system deviates from a normal ATL P1000 media changer General Information e Number of Elements Import Export Element The DX Series system does not have an Import Export Element Export Element whereas the ATL P1000 library can be configured with up to 8 Import Export Elements e Storage Element The DX Series system supports the following maximum storage elements e DX30 1280 e DX100 5120 Quantum DX Series Softw
127. ape drive is in the default sequential mode of operation and an UNLOAD command is received by the subsystem the current cartridge is unloaded and automatically moved to the magazine slot from which it was received The cartridge from the next magazine slot if the slot is not empty automatically moves from the magazine into the drive is loaded and made ready If the next magazine slot is empty no CHECK CONDITION status is created When the cartridge is unloaded into the last magazine slot the subsystem does not cycle back to slot 0 This prevents accidental overwriting of data when using a media loader subsystem in sequential auto loading mode The next cartridge in the cycle must be selected and loaded manually or with a SCSI MOVE MEDIUM command The sequential loading feature of the loader can be enabled disabled by modifying the ENALDRAUTOLD and DISLDRAUTOLDMC parameters of EEPROM mode page 3Eh of the MODE SELECT command A media loader does not affect the tape drive s processing of the LOAD portion of the LOAD UNLOAD command Quantum DX Series Software Interface Guide 143 Chapter 3 Emulated DLT7000 SCSI Commands Load Unload 1Bh Table 99 LOAD UNLOAD Command Descriptor Block Data Format Table 100 LOAD UNLOAD Command Descriptor Block Field Descriptions 144 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 1Bh 1 Logical Unit Number Reserved ae Reserved
128. apter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h 86 Bit Byte 7 6 5 4 3 2 1 0 48 51 Reserved 00000000h 52 Vendor Unique 0000h 53 Element Address This field indicates the address of the element being reported by that element descriptor Except e When the element is in a normal state it is set to zero e When the element is in an abnormal state it is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields Full e The Full field is set to 1 whenever the element contains a tape cartridge e Itis set to 0 otherwise Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to 1 SValid Invert and Source Storage Element Address Source Valid Source Storage Element Address field and the Invert bit information value of 0 indicates these fields are not valid Primary Volume Tag Information If the Volume Tag information was requested in the command block the Primary Volume Tag Information field is included in the element descriptor This field contains the information read from the bar code affixed to each tape cartridge its format is shown in table 57 Volume Identification Field This is a left justified sequence of ASCII characters that represents the bar code scanned from the cartridge followed by 20h bla
129. are Interface Guide 301 Appendix E DX Series Software Deviations 302 DxX3000 800 e DX5000 1600 The ATL P1000 library can be configured with a maximum of 40 storage elements e Data Transport Element The DX Series system supports the following maximum transport elements e DxX30 30 e DX100 55 e DxX3000 32 e DX5000 64 The ATL P1000 library can be configured with a maximum of 4 data transport elements Currently all DX Series data transport elements are of the Quantum DLT 7000 type whereas the ATL P1000 supports a variety of different tape drive types Initialize Element Status Implemented per specification See Initialize Element Status 07h on page 13 for more information Initialize Element Status with Range Implemented per specification This will take less than a second to complete whereas a P1000 would take minutes See Initialize Element Status with Range E7h on page 14 for more information Inquiry The DX Series supports the additional Pages 80h Unit Serial Number Page and 83h Device Identification Page See Inquiry 12h on page 16 for more information Quantum DX Series Software Interface Guide Appendix E DX Series Software Deviations Log Sense Log sense page 30h parameter data is all zeroes example emulated library statistics are not maintained See Log Sense 4Dh on page 26 for more information Mode Select 6 10 Implemented per specification See Mode Sele
130. ata Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description PS Parameters Savable For the MODE SELECT 6 10 commands this field is reserved 0 Additional Indicates number of bytes in that page not Page Length including bytes 0 and 1 Page Information in this field depends on the mode page Defined or Vendor Unique Parameter List The READ WRITE Error Recovery Page controls the drive s response to error conditions that arise during the course of READ and WRITE command processing Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 0 Page Code 01h 1 Additional Page Length OAh 2 Rsv d Rsv d TB Rsb d EER 1 PER DTE 0 DCR 0 3 Read Retry Count 4 7 Reserved 8 Write Retry Count 9 11 Reserved Quantum DX Series Software Interface Guide 181 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 138 Error Recovery Page Field Descriptions 182 Field Name PS Description Parameters Savable For MODE SELECT this bit must be 0 Additional Page Length This field indicates the number bytes in the page However the value does not include bytes 0 and 1 The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT If the page length does not match that expected by the drive a CH
131. ay 400 GB drives Number of arrays 1to4 Total number of virtual cartridges DX100 Storage Elements Virtual tape drives 640 250GB drives 1280 400GB drives 2 to 55 Virtual tape cartridges 2 to 320 per array 250GB drives 640 per array 400GB drives Quantum DX Series Software Interface Guide 3 Chapter 1 Theory of Operation Medium Changer Elements Table 3 DX3000 Storage Elements Table 4 DX5000 Storage Elements DX100 Storage Elements Number of arrays 1 to 16 Total number of virtual cartridges 2560 250GB drives 5120 400GB drives DX3000 Storage Elements Virtual tape drives 1 to 32 Virtual tape cartridges 1 to 80 per LUN Number of RAID Sets 1to2 Total number of virtual cartridges 1 to 400 per LUN 800 max DX5000 Storage Elements Virtual tape drives 1 to 64 Virtual tape cartridges 1 to 80 per LUN Number of RAID Sets 1to4 Total number of virtual cartridges 1 to 400 per LUN 1600 max Quantum DX Series Software Interface Guide Chapter 1 Theory of Operation Events Events Power Cycle DX Series Unit On Line Initialization Failure Events are system conditions created by failures or operator actions such as changing the DX Series system state to offline Some events appear as states on the control panel Events are recorded in sense data Depending on the interface the host can obtain the sense
132. ber 6532501 represents the DX3000 system part number 6532502 represents the DX5000 system part number e Product Revision Level Both the P1000 DX30 DX100 DX3000 and DX5000 firmware revision level are in the format xxxx The supported vital product data pages page provides a directory of the vital product data pages that are supported The pages that are supported are e Unit Serial Number Page 80h e Device Identification VPD page Page 83h Bit Byte 7 6 5 4 3 2 1 0 0 Peripheral Qualifier Peripheral device type 1 Page Code 00h 2 Reserved 3 Page length 3 Quantum DX Series Software Interface Guide Table 12 Unit Serial Number Page Page 80h Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Bit Byte 7 6 5 4 3 2 1 0 4 00h this page 5 80h Unit Serial Number Page 6 83h Device Identification Page Unit Serial Number Page 80h The Unit Serial Number Page Byte 2 in table 9 specifies which page of vital product data information the target shall return The supported Page Code is 80h to return the Serial Number Page see table 12 Peripheral device type Page Code 80h Reserved 00h Page length n 3 size of the product serial number Product serial number up to 12 bytes Device Identification VPD page Page 83h The device identification VPD page
133. bit Not supported DExcpt Disable Information Exception Operations When this bit 0 the reporting method specified by the contents of MRIE is selected When this bit 1 all information exception operations are disabled and the contents of the MRIE field are ignored When in this mode the TapeAlert Log page is polled by the software To enable CHECK CONDITION mode DExcpt should 0 Test Not Supported LogErr Error Log Not supported MRIE Method for Reporting Informational Exceptions The tape drive uses the contents of this field to report information about exception conditions Three methods are available Value 00h Method No reporting of Informational Exception Conditions The device server does not report information exception conditions 03h Conditionally Generate Recovered Error The device server reports informational exception conditions if such reports of recovered errors is allowed by returning CHECK CONDITION status on the next SCSI command except INQUIRY and REQUEST SENSE commands following detection of the condition The Sense Key is set to RECOVERED ERROR with an additional sense code of 5D 00 TapeAlert Event The SCSI command with CHECK CONDITION completes without error prior to the report of any exception condition and does not need to be repeated Quantum DX Series Software Interface Guide 225 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10
134. bytes in the Control Mode Page being transferred The value for this byte is OEh DCE Data Compression Enable The value returned for this bit depends on the current WRITE density of the tape drive 0 Write compression is Disabled 1 Write compression is Enabled Quantum DX Series Software Interface Guide 217 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name Description DCC Data Compression Capable The value returned for this bit indicates whether this tape drive supports data compression 0 Data Compression is disabled 1 Data Compression is enabled DDE Data Decompression Enable The value returned for this bit indicates whether data decompression is enabled or not 0 Data Decompression is Disabled 1 Data Decompression is Enabled Note that when the tape drive reads compressed data from tape it automatically decompresses the data before sending it to the initiator The value for this bit therefore is always 1 RED Compression Algorithm Report Exception on Decompression The tape drive does not report exceptions on decompression boundaries between compressed and decompressed data The value returned for RED is 00h The value for this field is 10h This indicates the Lempel Ziv high efficiency data compression algorithm Decompression Algorithm The value for this field is 10h This indicates the Lempel Ziv high efficiency data dec
135. cccsersadesesteessscvevanenedcugsnsentocngsavebsteutensed 174 READ WRITE Error Recovery Page 01h oo eee 181 Disconnect Reconnect Page 02 cece ceeeeeteeeeeeeneteteeenenenes 183 Control Mode Page OAD eee cesesseseseseessesesesesssesesesescseseaeseeeees 185 Data Compression Page OFN ccceseeeseesssssseeseesesseseseseneseseseees 188 Device Configuration Page 10h eeesssseseseseessseeesesseseneees 190 Medium Partition Page 11h occ cents tenseeneneteteneneneees 194 TapeAlert Page TCh scccsisssscessssssssctscsssssstosctsassscedosoastssssvebeataintacvesessetass 196 EEPROM Vendor Unique Page BEN eee eeeseeeeeeeeeeneeeeees 200 Changeable Parameters within MODE SELECT cceeseeseeeeees 200 Mode Sense 6 10 LAK SAD woe cee ccseseseeeesesesseseecneneecesaeseeeeeenens 202 MODE SENSE Data Headers cece eeseseseesesescscesesssesesneeeseeeeneeeseas 204 MODE SENSE Block Descriptor s ssessssseessessessseessserrrerertererteresrereere 206 MODE SENSE Mode Pages eseeeeseererresrreerrsrrresreserrerreseerrerrreeresieesere 209 Prevent Allow Medium Removal 1Eh seseeeeseseeseeresirsisrrisrsrsrerrrreree 227 Read 08H siiis sisinta cssessssessvavsssdesbuevessscssveveasseadseveastessvevesezesssecsssesbevense 229 Read Block Limits O5h sninn aa a a aa 232 Read Buffer S CM ricreato eunen a e edets 234 Combined Header and Data Mode ss sssssessssssesesrissessereesresessrseesees 236 Data MOG iis cciisc
136. ct 15h on page 32 for more information Mode Sense 6 10 Element Address Page the number of storage elements is as follows e DxX30 320 e DxX100 320 DxX3000 800 e DX5000 1600 The number of import export field is 0 the number of data transport elements is as follows e DxX30 30 e DxX100 55 e DX3000 32 e DX5000 64 whereas the ATL P1000 library uses 40 8 and 4 respectively Device Capabilities Page the StorIE field i e load port is 0 indicating that it is not capable of storing a tape cartridge Additional fields with IE as the source or destination are also 0 indicating the movement transfer is not allowed See Mode Sense 1Ah on page 39 for more information Quantum DX Series Software Interface Guide 303 Appendix E DX Series Software Deviations 304 Move Medium Implemented per specification See Move Medium A5h on page 50 for more information Position to Element Implemented per specification See Position To Element 2Bh on page 52 for more information Prevent Allow Medium Removal The DX Series system returns a check condition unsupported command whereas the ATL P1000 supports this command Read Element Status Implemented per specification See Read Element Status B8h on page 54 for more information Read Buffer The DX Series system returns a check condition unsupported command whereas the ATL P1000 supports this command Ready Import The DX Series sys
137. ction with Peripheral Qualifier 3 RMB A Removable Medium Bit of 1 indicates medium is removable Device Type Modifier This field is not supported and should return a value of 0 ISO and ECMA Version 0 code value indicates target does not claim compliance to ISO version of SCSI ISO IS 9316 or ECMA version of SCSI ECMA 111 ANSI Approved Version 2 indicates the device complies with the SCSI 2 specification AENC The asynchronous event notification capability bit of 0 indicates the device does not support asynchronous event notification capability TrmlOP A terminate I O process value of 0 indicates the device does not support the TERMINATE I O PROCESS message Response Data Format 2 indicates data must be in format specified in SCSI 2 spec Additional Length The length in bytes of additional inquiry data available RelAdr A Relative Address of 0 indicates the device does not support relative addressing for this DX Series system WBus32 0 bit value DX Series system does not support 32 bit wide transfers Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h WBus16 1 bit value indicates the DX Series system supports 16 bit wide transfers Sync Synchronous transfer value of 0 indicates the device does not support synchronous data transfer Linked Linked command value of 0 indicates the device does not support linked commands for this DX Series sy
138. d Additional Sense Code Qualifier indicate why an operation cannot be carried out For example this might occur if the specified source element or destination element does not contain a tape cartridge For a summary of the conditions sense key and additional sense encoding see table 226 on page 279 The format for the Move Medium command block is shown in table 37 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code A5h 1 Logical Unit Number Reserved 00h 2 MSB Transport Element Address 0000h 3 LSB Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Move Medium A5h Bit Byte 7 6 5 4 3 2 1 0 4 MSB Source Element Address 5 LSB 6 MSB Destination Element Address 7 LSB 8 Reserved 0000h 9 Invert 10 Reserved 00h 0 11 Reserved 00h Logical Unit Number The Logical Unit Number must be set to 0 This field indicates the logical unit to which the command is sent Transport Element Address The default medium transport element address of 0 or the medium transport element address specified by the Mode Sense Data can be used Source Element Address The source element address specifies the location from which the medium is taken Destination Element Address The destination address specifies the location to which the medium is moved Invert The medium chan
139. d Field 26 01 Parameter List Error Parameter Not Supported 26 02 Parameter List Error Parameter Value Invalid 27 80 Hardware WRITE Protect 27 82 Data Safety WRITE Protect if Use Cleaning Tape LED is lit use a cleaning tape 28 00 Not Ready To Ready Transition Quantum DX Series Software Interface Guide 291 Appendix C DLT7000 Sense Code Values ASC ASCQ Description 29 00 Reset Occurred 2A 01 Mode Parameters Changed 2A 02 Log Parameters Changed 2F 00 Commands Cleared by Another Initiator 30 00 Incompatible medium cannot read medium 30 02 Incompatible Format 30 03 Unit Not Ready Incompatible Media Cleaning Cartridge Installed 37 00 Rounded Parameter 39 00 Saving Parameters Not Supported 3A 00 Media Not Present 3A 80 Media Not Present VU Cartridge Missing 3B 00 Sequential Positioning Error 3B 08 Repositioning Error 3B 0D Media Destination Element Full 3B OE Media Source Element Empty 3D 00 Invalid Bits in ID Message 3F 01 Microcode has been Changed 3F OE Reported Luns Data has Changed 43 00 Message Error 44 00 Internal Target Failure 44 80 Unexpected Selection Interrupt 292 Quantum DX Series Software Interface Guide Appendix C DLT7000 Sense Code Values ASC ASCQ Description 44 82 Command Complete Sequence Failure 44 83 SCSI Chip Gross Error Illegal Command Status 44 84 U
140. d with each tape cartridge should be returned as part of the status information e The volume tag or bar code is updated for each tape cartridge whenever it is moved with a Move Medium command The volume tag information for all tape cartridges can also be updated using the Initialize Element Status command Since tape cartridges are a single sided media only a single volume tag is supported per tape cartridge Element Type Code This field is used to indicate which type of element medium transport storage import export data transfer or all is to be reported by this command e Oindicates all element types reported e 1indicates medium transport element e 2indicates storage element e 3 indicates import export element Tech Tip The DX Series system does not support import export elements e Aindicates data transfer elements Starting Element Address and Number of Elements These fields are used to select the range of elements to be reported Within this range no status information is reported for an undefined element address e Only elements matching the indicated type are returned e No elements with an address smaller than the Starting Element Address is reported Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Beginning with the first defined element with an address greater than or equal to the Starting Element Address all
141. data tape cartridge and follow the appropriate steps to use a cleaning cartridge 22 Expired Critical The cleaning cartridge that was used has expired Wait Cleaning Media for all tape drive operations to complete then use a valid cleaning cartridge for cleaning Quantum DX Series Software Interface Guide 165 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Flag Severity Level Meaning 31 Hardware B Critical The tape drive may have a hardware fault Contact a service representative 32 Interface Warning The tape drive may have a hardware fault Contact a service representative 34 Download Warning The attempted firmware download has failed Fail 40 Loader Critical The mechanism that loads media to the tape drive is Hardware A experiencing problems communicating with the tape drive Severity levels are Informational Warning and Critical Informational flags provide a status type message Warning flags indicate that there is the possibility of loss of data and Critical flags indicate the possibility of loss of data and that user intervention is urgently required Read Write This page begins with a 4 byte header followed by the log parameter Compression blocks of 6 or 8 bytes depending on the Parameter Code selected Page 32h Tech Tip Read write compression page updates only the bytes read write from and to the host in the DX Series system
142. defined element with an address greater than or equal to the Starting Element Address all defined type matching elements are tagged until the last element of the specified type e Send Action Code The Send Action Code field specifies the test to be evaluated The DX Series system only implements the Translate search primary tags ignore sequence numbers 05h action Parameter List Length This field specifies the number of bytes in the Send Volume Tag Parameters This value should always be 28h The format of the Send Volume Tag Parameters is shown in Table 68 Bit Byte 7 6 5 4 3 2 1 0 MSB 0 31 Volume Identification Template Field LSB 32 Reserved 0000h 33 34 MSB Minimum Volume Sequence Number 0000h 35 LSB Quantum DX Series Software Interface Guide 103 Chapter 2 Emulated Medium Changer SCSI Commands Send Volume Tag B6h 104 Bit Byte 7 6 5 4 3 2 1 0 36 Reserved 0000h 37 38 MSB Maximum Volume Sequence Number 0000h 39 LSB Volume ID Template Field The search template to be evaluated by the translate function This may contain the and wildcards where match any single character and match any number of characters Any characters that follow the wildcard are ignored Min Vol Sequence Number Sequence numbers are not supported This must be set to 0
143. dition ASC 80 ASCQ 22 e Cleaning Cartridge Installed ASC 30 ASCQ 03 e Operator Medium Removal Request ASC 5A ASCO 01 SValid e The SValid bit is set to one if the information in the Source Storage Element Address field is valid Quantum DX Series Software Interface Guide 91 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h e Ifthe information is unknown the SValid bit is set to 0 Invert The Invert field is not supported and is set to 0 Source Storage Element Address The Source Storage Element Address represents the address of the last storage element that held the cartridge The SValid field indicates whether this information is valid The format of an element descriptor for an element of the data transfer element type is shown in table 61 Table 61 Data Transfer Bit Byte 7 6 5 4 3 2 1 0 Element Descriptor 0 MSB Element Address 1 LSB 2 Reserved 0h Access Except wit Full 3 Reserved 00 4 Additional Sense Code 5 Additional Sense Code Qualifier LU i 6 Not Bus Rsrvd ID Valid Valid Rsvd Logical Unit Number 7 SCSI Bus Address 8 Reserved 00h 9 SValid a Reserved 00h 10 Source Storage Element Address 11 12 47 Primary Volume Tag Information Field omitted if AVolTag 0 92 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer S
144. e 7 5 4 3 2 0 0 PS 0 Page Code 02h 1 Additional Page Length OEh 2 Buffer Full Ratio 3 Buffer Empty Ratio MSB 4 5 Bus Inactivity Limit LSB MSB 6 7 Disconnect Time Limit LSB MSB 8 9 Connect Time Limit LSB MSB 10 11 Maximum Burst Time LSB 12 Reserved DTDC 13 15 Reserved Quantum DX Series Software Interface Guide 183 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 140 Disconnect Field Name Description Reconnect Page Field Despriptions PS Parameters Savable For MODE SELECT this bit must be 0 Additional This field indicates the number bytes in the page Page Length However the value does not include bytes 0 and 1 The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT If the page length does not match that expected by the drive a CHECK CONDITION status is returned sense key set to ILLEGAL REQUEST The drive returns a CHECK CONDITION status with sense key set to ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field with values not supported or changeable In such cases no parameters are changed as a result of the command Buffer Full Not supported Any value is ignored Ratio Buffer Not supported Any value is ignored Empty Ratio Bus Not supported Any value is ignored Inactivity Limit Disconnect Not supported Any value is ignored Time Limit Connect
145. e is given in 512 byte increments For example a value of 8 indicates 4K bytes Values that are not multiples of 8 are rounded up to the nearest multiple of 8 DTDC Data Transfer Disconnect Control The value in this field specifies the restriction when a disconnect is permitted 214 Quantum DX Series Software Interface Guide Table 166 Control Mode Page Data Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Control Mode Page 0Ah The Control Mode Page allows the user to determine whether the tape drive returns a CHECK CONDITION status when one of the WRITE and READ counters has reached a specified threshold Bit Byte 7 6 5 4 3 2 1 0 0 Reserved Page Code 0Ah 1 Page Length 06 2 Reserved RLEC 3 Queue Algorithm Modifier 0 Reserved Qerr 0 DQue 0 EECA Reserved RAEN UAAE EAENP a2 O P NP 0 5 Reserved MSB 6 7 Ready AEN Hold off Period 0 LSB Quantum DX Series Software Interface Guide 215 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Table 167 Control Mode Page Field Descriptions Field Name Description Page Length The value in this field indicates the number of bytes in the Control Mode Page being transferred The value for this byte is 06h RLEC Report Log Exception Condition This bit indicates whether the tape drive retu
146. e Mode field only a Buffer ID of 0 is supported If the Buffer ID field is a value other than 0 the command is rejected The target detects and rejects commands that would overrun the buffer Buffer Offset The data to be transferred is preceded by a 4 byte header consisting entirely of reserved bytes This header is discarded not stored within the buffer The buffer offset field must be 0 for this mode Similar to Header and Data Mode except there is no header in the data passed to the target Any potential buffer overruns are detected and the command is rejected Caution During the actual reprogramming of the FLASH EEPROM if any type of power fail occurs or if the reprogramming fails before completion the tape drive subsystem becomes unusable and the tape drive must be replaced Quantum DX Series Software Interface Guide 275 Chapter 3 Emulated DLT7000 SCSI Commands Write Buffer 3Bh Download Using buffer offsets the host can download the firmware image into the Microcode Mode target s buffer in pieces These commands do not cause the new image to 100b become active A Download and Save Mode WRITE BUFFER command must be issued for the image to become active The tape drive must be empty of tape medium to allow downloading of an image This is a safeguard against accidentally starting a firmware update If a tape cartridge is loaded when all or part of a firmware image has been downl
147. e counter returned for Parameter Code 08h by 1 048 576 and then adding the value of the counter returned by Parameter Code 09h results in the actual total bytes written to the tape drive Device Wellness Page 33h Device Status Page 3Eh The Device Wellness Page is not supported The Device Status Page is not supported Quantum DX Series Software Interface Guide 171 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Mode Select 6 10 15h 55h 172 The MODE SELECT command available in either 6 or 10 byte format enables the host to configure the tape drive Implementing MODE SELECT and MODE SENSE requires handshaking between the host and the drive Before configuring the drive the host should issue a MODE SENSE command to the drive to obtain a report of the current configuration and determine what parameters are configurable The host interprets this information and then may issue MODE SELECT to set the drive to the host s preferred configuration The Mode Parameter List is passed from the initiator to the drive during the command s DATA OUT phase Information for the drive is carried on a number of pages each of which serves to set the tape drive s operating parameters The MODE SELECT pages supported and the sections of this manual that details each page are Page Description Code olh READ WRITE Error Recovery Page 02h Disconnect Reconnect P
148. e of 1 indicates the primary volume tag information field is present in each of these element descriptor blocks e A value of 0 indicates these bytes are omitted from the element descriptors that follow AVolTag e An Alternate Volume Tag field value of 1 indicates the alternate volume tag information field is present in each of these element descriptor blocks e A value of 0 indicates these bytes are omitted from the element descriptors that follow Element Descriptor Length Field indicates the number of bytes in each element descriptor Quantum DX Series Software Interface Guide 59 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h e Byte Count of Descriptor Data Available Byte Count of Descriptor Data Available indicates the number of bytes minus 7 of descriptor data excluding this header that are returned for the descriptors of the specified type if an adequate allocation length had been specified There are 4 types of element descriptor blocks 1 for each element type e There are several fields found in more than 1 element type descriptor as well as fields which are unique to an element descriptor e Fields found in more than 1 type of element descriptor are indicated by the same name in the following illustrations and descriptions e The format of an descriptor for an element of the medium transport element type is shown in table 42
149. e via LOG SELECT Quantum DX Series Software Interface Guide 159 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Table 111 LOG SENSE Command Descriptor Block Field Name Description Page Code The Page Code field identifies which log page is being requested by the initiator If the page is not supported then the command terminates with a CHECK CONDITION status sense key set to ILLEGAL REQUEST and additional sense code of INVALID FIELD IN CDB Supported pages are Page Code Page Definition 00h Supported Pages Log Page Page 00h 02h Write Error Counter Page not supported 03h Read Error Counter Page Page 03h not supported 07h Last n Error Events Page 07h not supported 2Eh TapeAlert Page 2Eh 32h Read Write Compression Page 32h 33h Device Wellness Page 33h not supported 3Eh Device Status Page 3Eh not supported 160 Quantum DX Series Software Interface Guide Field Name Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Description Parameter Pointer The Parameter Pointer field allows the host to specify at which parameter within a log page the requested data should begin For example if a page supports parameters 0 through 5 and the Parameter Pointer contains 3 then only parameters 3 4 and 5 are returned to the initiator Similarly if a page supports parameters 1 3 and 6 and the Parameter Pointer contains 2 then only parameters 3 and
150. ecification The SCSI 2 communications specification is the proposed American National Standard for information systems dated March 9 1990 Copies may be obtained from Global Engineering Documents 15 Inverness Way East Englewood CO 80112 800 854 7179 or 303 397 2740 Quantum Corporation company contacts are listed below Quantum Documentation To order documentation on the DX Series system or other products contact Quantum P O Box 57100 Irvine CA 92619 7100 949 856 7800 800 284 5101 Quantum DX Series Software Interface Guide Preface Technical Publications To comment on existing documentation send e mail to doc comments quantum com Visit the Quantum home page at http www quantum com Customer Support The Quantum Customer Support Department provides a 24 hour help desk that can be reached at North South America Asia Pacific Rim Europe Middle East Africa 949 725 2100 or 800 284 5101 International Code 61 7 3839 0988 International Code 44 0 1256 848748 Send faxes for the Customer Support Department to North South America Asia Pacific Rim Europe Middle East Africa 949 725 2176 International Code 61 7 3839 0955 International Code 44 0 1256 848777 Send e mail for the Customer Support Department to North South America Asia Pacific Rim Europe Middle East Africa helpdesk quantum com apachelp quantum com ukhelpdesk qua
151. ed 4 5 Reserved 6 7 Block Descriptor Length 176 Quantum DX Series Software Interface Guide Table 132 MODE SELECT Mode Parameter Header Field Descriptions Field Name Media Type Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Description This field is ignored by the MODE SELECT command Buffered Mode Default 1 The drive implements immediate reporting on WRITE commands through its buffered mode With Buffered Mode set to 1 the drive reports GOOD status on WRITE commands as soon as the data block has been transferred to the buffer If this field 0 then the drive does not report GOOD status on WRITE commands until the data blocks have been written to tape When Buffered Mode is not used the tape drive suffers significant performance degradation and possible capacity depending on tape format block size and compression When writing 2 6 or 6 0 GB formats and block size that is a multiple of 4 Kbytes there is no capacity loss Likewise when using the 10 or 20 GB format with compression disabled and block size a multiple of 8 Kbytes there is no capacity loss When writing 10 or 20 GB format with compression enabled and Buffered Mode disabled some capacity loss can occur The block packing feature is essentially disabled by turning off Buffered Mode If Buffered Mode is set to a number greater than 1 the command is rejected with CHECK CONDITION sense key of ILLE
152. ed Only density codes 80h 85h may effect the compression setting Data Compression Page field DCE Erase Implemented per specification Note The DX Series system will perform this operation in less than 5 seconds whereas a DLT 7000 may take upwards of over an hour to perform See Erase 19h on page 122 for more information Inquiry The DX Series supports the additional Page 83h Device Identification Page See Inquiry 12h on page 124 for more information Load Unload Implemented per specification See Load Unload 1Bh on page 142 for more information Locate Implemented per specification Note The DX Series system will perform this operation in less than 5 seconds whereas a DLT 7000 may take much longer See Locate 2Bh on page 147 for more information Quantum DX Series Software Interface Guide 307 Appendix E DX Series Software Deviations 308 Log Select Implemented per specification See Log Select 4Ch on page 149 for more information Log Sense Write Error Counter Page 02h is not supported Enable Threshold Comparison ETC not supported Read Error Counter Page 03h cumulative values parameter codes 2 3 5 6 8000h are always 0 Enable Threshold Comparison ETC not supported Device Wellness Page 33h parameter code data are always 0 Device Status Page 3Eh parameter code 0002h is always 0 See Log Sense 4Dh on page 158 for more information Mode
153. ed Log Page wo eee n AAEE Ea 28 Medium Changer Statistics Page eee teense 28 Log Parameter esses in nrn eene enaid iaia 29 Supported Log Parameter Codes for 30h Page ee 30 Mode Select Command cece sseseseeeesesessssneneeeenenenes 32 Mode Select Data Vendor Unique Page 20h 33 Mode Select Data Vendor Unique Page OOh ee 34 Mode Select Data Element Address Assign Page 35 Changeable Parameters within MODE SELECT 04 37 Mode Sense Command o cece ee cesseseeeesesesseesessseseees 40 Mode Sense Data Header o 0 cece cesses ee eeceeeneneteeenenees 41 Mode Sense Data Vendor Unique Page 00H eee 42 Mode Sense Data Element Address Assign Page 43 Mode Sense Data Trans Geometry Para Page 00 46 Mode Sense Data Device Capabilities Data 47 Mode Sense Data Vendor Unique Page 20h 48 Move Medium Command uu eee csssssesssessssssnenesseeseees 50 Position To Element Command eesssseseeseesneneseees 52 Read Element Status Command uu cesessesseseseneneeesens 54 Read Element Status Data 0 ccceesesescseseseeeceeeeseeceeseenaeeees 58 Element Status Page sess iivertctsenesetieiied wiltisenaestessecstas beepesator 59 Medium Transport Element Descriptor oe eeeeneeeeeee 60 Primary Volume Tag Information eee ee eeeeeeeees 62 Storage Element DeScriptoT cee eeseseeeeeeseseteseneeseneees 62 Import Export Element Descriptor 0 0
154. ed from the beginning The format for this command data block is shown in table 3 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 07h 1 Logical Unit Number Reserved 00h 2 Reserved 00h 3 Reserved 00h 4 Reserved 00h 5 NBL Reserved 00h Logical Unit Number The Logical Unit Number must be set to 0 Field indicates the logical unit to which the command is sent e NBL e ANo Bar Code Labels value of 1 specifies the inventory to not scan the bar codes of the elements and set the corresponding primary volume tags to empty e A value of 0 specifies element bar code labels are to be scanned and placed in the primary volume tags Quantum DX Series Software Interface Guide 13 Chapter 2 Emulated Medium Changer SCSI Commands Initialize Element Status with Range E7h Initialize Element Status with Range E7h Table 8 Initialize Element Status with Range Command The Initialize Element Status with Range command allows the host to request an inventory of a range of elements in the DX Series system The DX Series system conducts the inventory and determines if each element within the range contains a tape cartridge The inventory reads each tape s bar code unless commanded not to The DX Series system does not accept any other commands from the host during the inventory process The host can issue an Abort of the inventory for the DX Series system If another Initial
155. eden E ieee 268 VERIFY Command Descriptor Block Data Format 269 VERIFY Command Data Field Descriptions 0 269 WRITE Command Descriptor Block Data Format 271 WRITE Command Data Field Descriptions 272 WRITE BUFFER Command Descriptor Block Data Format eonen setara A othe e E iS 274 WRITE BUFFER Command Data Field Descriptions 275 WRITE FILEMARKS Command Descriptor Block Data Format sesiis osease se E N 277 WRITE FILEMARKS Command Data Field Descriptions277 Sense Data Values Hexadecimal seeeeeeeereerereerereere 279 Sense Data Values Hexadecimal ns 282 DLT7000 Tape Drive Sense Data Values Hexadecimal 290 Quantum DX Series Software Interface Guide m Preface Se This guide describes the procedures and issues involved in the development of hierarchical mass storage software applications and utilities to communicate with the Quantum DX Series enhanced data protection system and this includes the following models e DxX30 e Dx100 e Dx3000 e Dx5000 Audience This guide is designed for use by software engineers who have a basic understanding of SCSI principles and technology Purpose This document provides information about DX Series software including Theory of operation Software interfaces for both the DX Series system and the virtual DLT7000 tape drives e Sense data values Quantum DX Series Software Interface Guide xxi Preface Docu
156. efore entering the On line state If set to 0 the DX Series system only inventories itself when commanded to by the Init Element Status or Init Element Status with Range command Quantum DX Series Software Interface Guide Table 28 Mode Select Data Element Address Assign Page Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h Ulnit Not supported Parity Not supported NBL No bar code Labels e Valid only if the Alnit field value is 1 when DX Series system performs an inventory due to going on line and the NBL field value is 1 bar codes are not scanned and primary volume tags are set to empty e If NBL field is set to 0 when the DX Series system performs an inventory due to going on line bar codes are scanned and their value placed in the corresponding primary volume tag NRDC Not Ready Display Control Not supported MDC Message Display Control Not supported Maximum Parity Retries Not supported Display Message Not supported The format for the Element Address Assignment Page is shown in table 28 Bit Byte 7 6 5 4 3 2 1 0 Rsrvd 0 1 Parameter Length 12h 0 PS 0 Page Code 1Dh 2 MSB First Medium Transport Element Address 3 LSB Quantum DX Series Software Interface Guide 35 Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h 36
157. em is ready to communicate with the diagnostic PC Set the DX Series system offline from the GUI 80 OB COMMAND ABORTED BY USER Informational message No action is necessary 80 OE DATA TRANSFER CHANGED A drive has been inserted into the system Use Read Element Status to determine status of drives 80 OF LOW POWER ERROR Check power connections 286 Quantum DX Series Software Interface Guide ASC 80 ASCQ 22 Appendix B Media Changer Sense Code Values Message Name Description ELEMENT CONTENTS UNKNOWN The contents of an element address are unknown Issue a Read Element Status for the element address If contents are still unknown issue an Initialize Element Status command 88 00 WARNING SAFE TEMPERATURE EXCEEDED This is only a warning that the temperature in the DX Series system exceeds the normal operational temperature 96 8 F 88 01 MAXIMUM TEMPERATURE EXCEEDED DX Series system turns off and remains off until the temperature returns to an acceptable level 59 90 F 8F 00 DX SERIES UNIT COMMAND TIMED OUT Verify that communications to DX Series system still exists by issuing another command FO 01 RESERVATION CONFLICT Internal firmware error Report this occurrence and previous command if known to Technical Support F1 00 COMMAND UNSPECIFIED Internal firmware error Report this occurrence and previou
158. ence during which e System goes through power sequencing and intitialization e DxX Series system responds to these commands e Inquiry e Request Sense Log Sense e Mode Sense e All other commands return a Logical Unit is Not Ready check condition SK 2 ASC 04 ASCQ 00 When the power on initialization is complete 1 DxX Series system generates a Power On Reset Occurred event SK 6 ASC 29 ASCQ 00 2 System performs additional operational sequences depending on the condition of the system To start the on line initialization sequence 1 Power on the DX Series system During the on line initialization sequence Quantum DX Series Software Interface Guide DX Series Unit Inventory Chapter 1 Theory of Operation Operational Sequences Browser indicates that the DX Series system is performing the on line initialization sequence DX Series system responds to these commands e Inquiry e Request Sense e Log Sense e Mode Sense All other commands return a Logical Unit is Not Ready check condition SK 2 ASC 04 ASCQ 00 DX Series system performs an inventory of its elements When initialization completes the web based GUI changes to System On Line and the DX Series system is fully operational The DX Series system inventories its storage elements after power up upon receipt of an Initialize Element Status command or after the door is closed and the DX Series system is placed on line The local controller for t
159. ense Mode Sense e Check condition is set for all other commands and Unit Is Turned Off Line SK 2 ASC 80 ASCQ 09 is set in the sense data The DX Series system remains off line until one of the other operational sequences occur Typical For optimum system performance please note Application e Direct the host to check for any attention or error conditions the tape Enhancements DX Series system may have buffered by issuing Request Sense commands until no sense data available exists e The internal software does not support command queueing It is up to the host application to queue commands to the unit It may be advantageous for the application to group queued commands to require the least amount of actuator motion 8 Quantum DX Series Software Interface Guide DD G a Chapter 2 Emulated Medium Changer e SCSI Commands ee 9 9 This chapter describes the specific Small Computer Systems Interface SCSI 2 terminology in relation to the DX Series system Table 5 lists the SCSI 2 terms and their equivalent DX Series terms Table 5 SCSI 2 Terie SCSI 2 Term Equivalent DX Series Term Logical Unit DX Series system Initiator Host computer Data Transfer Element Virtual tape drive Medium Transport Element Virtual gripper mechanism Storage Element Storage bin DX Series system e Isa SCSI 2 medium changer devices the host computer serves as the SCSI initiator and issues commands to the DX Series syste
160. ent Library Present Set to 0 indicates no library present Non zero indicates library is present Module Revision A four byte ASCII string representing the revision level of the tape drive s module the controller PCBA attached to the tape drive Quantum DX Series Software Interface Guide 141 Chapter 3 Emulated DLT7000 SCSI Commands Load Unload 1Bh Load Unload 1Bh The LOAD UNLOAD command tells the target to load or unload the tape media in the tape cartridge If no cartridge is in the tape drive both LOAD and UNLOAD return a CHECK CONDITION status with a NOT READY sense key set Likewise if the drive has received an UNLOAD command with the Immediate bit set and then it receives another command that would require tape motion or if it receives a TEST UNIT 142 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Load Unload 1Bh READY command the drive returns a CHECK CONDITION STATUS with a NOT READY sense key set Note Operation of the UNLOAD version of this command is different if a media loader is present Two modes of operation are possible if a media loader is configured If none of the media loader specific commands have been issued the device operates in the sequential mode of operation described below Once a media loader specific command has been issued however the sequential mode of operation is disabled and the UNLOAD command becomes a NO OPERATION If the t
161. ent manner that a command has been completed Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system Media Changer The optional Element reservation feature defined for Medium Changer Considerations devices in the SCSI 2 ANSI specification is not supported The RELEASE command is defined the same as for the tape drive The whole loader unit can be released RESERVE RELEASE of the Loader and Drive LUNs are handled independently 244 Quantum DX Series Software Interface Guide Report LUNS AOh Table 197 Report Luns Command Chapter 3 Emulated DLT7000 SCSI Commands Report LUNS AOh The REPORT LUNS command requests that the peripheral device logical unit numbers of known logical units in the target be sent to the applications client The command only returns information about the logical units to which commands may be sent
162. eport for all requested data The size of the report is given in bytes The size is the total number of bytes that would be contained in the report for all requested data minus 7 The Request Volume Element Address command can be given with an Allocation Length of 8 to determine how much space must be allocated to transfer all of the status data requested by the command The format for the Volume Element Address Header is shown in table 54 82 Quantum DX Series Software Interface Guide Table 54 Volume Element Address Header Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Bit Byte 7 6 5 4 3 2 1 0 0 MSB First Element Address Reported 1 LSB 2 MSB Number of Elements Reported 3 LSB 4 Reserved 00h Send Action Code 05h 5 MSB 6 Byte Count of Report Available 7 LSB 8 X One or More Element Status Page s First Element Address Reported This field indicates the element address of the element with the smallest element address found to meet the command description block request Number of Elements Reported This field indicates the number of elements meeting the request in the command descriptor block The status for these elements is returned if sufficient allocation length was specified Send Action Code The Send Action Code is specified by the previous Send Volume Tag command The DX Series system only suppor
163. er Type 2 Reserved Quantum DX Series Software Interface Guide Table 15 Code Set Table 16 Association Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Bit Byte 7 6 5 4 3 2 1 0 3 Identifier length n 3 4 MSB Identifier n LSB e Code set The code set field specifies the code set used for the identifier field as described in table 15 This field is intended to be an aid to software that displays the identifier field Value Description Oh Reserved 1h The identifier field shall contain binary values 2h The identifier field shall contain ASCII graphic codes e g code values 20h through 7Eh 3h Fh Reserved e Association The association field specifies the entity with which the identifier field is associated as described in table 16 Value Description Oh The identifier field is associated with the addressed physical or logical device 1h The identifier field is associated with the port that received the request 2h 3h Reserved Quantum DX Series Software Interface Guide 23 Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Identifier Type The identifier type is described in table 17 Table 17 Identifier Type Value Description 00h Reserved 1h Vendor ID followed by the product identification field from the standard inquir
164. erienced as deferred errors Refer to the MODE SELECT command subsection for more information on Buffered Mode Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 0Ah 1 Logical Unit Number Reserved Fixed MSB 2 4 Transfer Length LSB 5 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide 271 Chapter 3 Emulated DLT7000 SCSI Commands Write OAh Table 221 WRITE Command Data Field Descriptions Exception Conditions 272 Field Name_ Description Fixed The fixed bit specifies both the meaning of the Transfer Length field and whether fixed length or variable length blocks are to be transferred When the Fixed bit is 0 Variable length block mode is selected A single block is transferred from the initiator and is written to the logical unit beginning at the current logical tape position Upon successful termination the tape is logically positioned after this block on the EOM P side The Transfer Length specifies the number of bytes that the drive handshakes out from the initiator as one block When the Fixed bit is 1 the Transfer Length field specifies the number of blocks to be transferred to the host beginning at the current tape position This form of WRITE is valid only if the logical unit is currently operating in the Fixed Block mode when it has been instructed to use fixed length blocks with MODE SELECT The current block length
165. essage allows the host to abort a process and stop the DxX Series system s operation at its next safe position bar code label The identification label on cartridges bus device reset message This SCSI 2 message causes the DX Series system to clear all I O processes The Unit Attention condition is set to indicate that the device has been reset calibration The software measurements and configuration required for successful operation of the DX Series system command complete message This SCSI 2 message is sent to the host after the DX Series system has completed the command operation and sent valid status information to the host This message does not indicate that the operation was completed successfully disconnect target to initiator message This optional SCSI 2 message disconnects the DX Series system from the host while performing an operation This frees the SCSI bus for other uses while the operation is in progress DLT Digital Linear Tape A magnetic tape technology used for backing up data on medium to large scale Loans Quantum DX Series Software Interface Guide 313 Glossary m 7 q I 314 DX Series system A backup device based on hard drives element A discrete physical entity that can hold a single tape cartridge and is represented by a unique 16 bit element address SCSI elements include storage bins tape drives load port bins and the gripper FCC Class A Standard established by
166. esssiscssscisssseicscssssicscicssessdacheveueasassastveadvesecavessiossvaseesbesbeseae 237 Descriptor Mode scien r te eases EE EE 237 Read Position BAW Mennea rtr ee a ee a EDE 238 Receive Diagnostic Results 1Ch sssssssssssssssssssssssressrsresresresresresresrenresress 241 Release Umit 170 ekre aiina earen dbisusssosteoggcassvaies lasessgsiates 243 Media Changer Considerations ss ssesssesiesissesrsesiertesrsrresrereeressress 244 Report LUNS A QR Jn icun i i e E E EE 245 Reguest Sense O3N wc Xess cnstsceses bien csdadeetties abe iini inia maie Aves aoko Teakon 247 Quantum DX Series Software Interface Guide v Appendix A Appendix B Appendix C Appendix D Appendix E Glossary vi Reserve Umit VOM scsisc sisecscisestiesetstardsne lanetounseipcevies R E A E 254 Rewind OU ceciessccecsvisnexss cxosuneisieagt EAE O a S E EE EEE ERER 257 Send Diagnostic LDN sscscccsssscsssesascecserpeanssescvevstesssesevoesdesassostoncnsvesvesevenveesders 258 Space TI Merenia e E A Elb eens eee 265 Test Unit Ready OO esnin naai 268 Verify V3 Miate EAEE ETE AER 269 Write QAR oeiee eie e ae E E EE ENEA 271 Exception Conditions esisiini ierit Ee nn e a Ee E aai 272 Write Bitter 3Bh crcire iin n e ANANE EE 274 Write Combined Header and Data Mode 000b s eeseiseeeeseeseeeee 275 Write Data Mode O10D s s c sccsesssecnssasssesleceseseviassessanednsrstesestseosnenersters 275 Download Microcode Mode O
167. est Unit Ready 00h Table 217 TEST UNIT READY Command Descriptor Block Data Format 268 The TEST UNIT READY command checks the tape drive to ensure that the unit is ready for commands involving tape movement If the drive has a tape loaded the command returns a GOOD status Otherwise CHECK CONDITION is reported Due to power cycle code update and tape loaded conditions it is possible to get multiple check conditions on a TEST UNIT READY command Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 00h 1 Logical Unit Number Reserved 2 4 Reserved 5 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide Verify 13h Table 218 VERIFY Command Descriptor Block Data Format Table 219 VERIFY Command Data Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Verify 13h The VERIFY command directs the tape drive to verify one or more blocks beginning with the next block on the tape Both CRC and EDCs are validated Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 13h 1 Logical Unit Number Reserved Immed BC Fixed MSB 2 4 Verification Length LSB 5 Unused Reserved Flag 0 Link 0 Field Name Description Immed Immediate When set to 1 the VERIFY command completes before any tape medium movement is done that is when the processing has been initiated Tech Tip T
168. fer a READ WRITE Data Transfer was aborted due to a bus parity error or unexpected ATN XX YY Code Update Event where XX Drive revision code YY Controller revision code 1 Medium changer specific command 2 Contact a service representative 3 Bad firmware image or code download possible 294 Quantum DX Series Software Interface Guide Appendix C DLT7000 Sense Code Values 0Dh VOLUME OVERFLOW No Additional Sense Code or Sense Code Qualifier 0Eh MISCOMPARE No Additional Sense Code or Sense Code Qualifier Filemark End of Medium EOM and Incorrect Length Indicator ILI Bits Filemark byte 2 bit 7 EOM byte 2 bit 6 and ILI byte 2 bit 5 are names of fields in the SCSI 2 REQUEST SENSE command Any of these bits may be set to a 1 even though the Additional Sense Code ASC Additional Sense Code Qualifier ASCQ bits have a value of 0 For example Filemark EOM ILI bit may be set to 1 with No Sense key 00h and ASC ASCQ 00 00 Filemark EOM ILI bit may be set to 1 with Recovered Error 01h and ASC ASCQ 00 00 Filemark BOM ILI bit may be set to 1 with Medium Error 03h and ASC ASCQ 00 00 Quantum DX Series Software Interface Guide 295 Appendix C DLT7000 Sense Code Values 296 Quantum DX Series Software Interface Guide MO G e Fibre Channel Topology ee Fibre Channel is a serial data transfer architecture for use with computers and mass storage devices t
169. ffect until one of these conditions is met e The initiator that made the reservation sends a valid Reserve command see table 62 capable of overriding the reservation e Element reservations replace all previous element reservations with the same Reservation ID from the same initiator and cannot override Unit reservations e Unit reservation can override any previous reservation from the same initiator regardless of Reservation ID e The DX Series system or element is released by a valid Release command from the same initiator e A Bus Device Reset message is received from any initiator e A hard reset occurs The occurrence of the last two conditions is indicated by the DX Series system returning a check condition status with a sense key of Unit Attention on the next command following the condition It is not an error to issue a Reserve Unit command to a DX Series system that is currently reserved to the requesting initiator e The target returns a Reservation Conflict status if a Unit Reserve command is e Attempted on a unit that has been reserved by another initiator e Contains any element previously reserved by another initiator e The target returns a Reservation Conflict status if an Element Reserve command is e Issued to an element previously reserved by another initiator e Contained in a unit that was reserved by any initiator e Issued to an element reserved using a different Reservation ID If after honoring a Unit Rese
170. for the set of physical locations and mechanisms within the DX Series system This guide uses the SCSI 2 term element to refer to one member of the DX Series system address space Each element is a discrete physical entity that can hold a single tape cartridge and is represented by a unique 16 bit element address The DX Series system consists of these medium changer elements e Medium transport element e Storage elements Data transfer elements Issue the Mode Sense command to determine e DxX Series system configuration e First address e Number of elements of each type medium transport storage or data transfer 2 Quantum DX Series Software Interface Guide Medium Transport Element Storage Elements and Data Transfer ELements Table 1 DX30 Storage Elements Table 2 DX100 Storage Elements Chapter 1 Theory of Operation Medium Changer Elements The medium transport element consists of the following component e Virtual gripper This mechanism can hold a single cartridge and is considered to be a single medium transport element It moves media between elements within the DX Series system The DX Series system emulation is described in the following tables e DX30 Storage Elements e DxX100 Storage Elements e DX3000 Storage Elements e DX5000 Storage Elements DX30 Storage Elements Virtual tape drives Virtual tape cartridges 2 to 30 2 to 160 per array 250GB drives 320 per arr
171. ger does not support medium rotation for handling double sided media The Invert bit must be set to 0 Quantum DX Series Software Interface Guide 51 Chapter 2 Emulated Medium Changer SCSI Commands Position To Element 2Bh Position To Element 2Bh Table 38 Position To Element Command 52 The Position To Element command is used by the host to position the medium transport element in front of another element within a DX Series system The host specifies the destination element in the command block The DX Series system then moves the transport element in front of the destination element The destination element can be one of these types e Storage Import Export Tech Tip The DX Series system does not support import export Data Transfer If the address is in error the DX Series system returns check condition status and sets the sense key to Illegal Request The format of the Position To Element command block is shown table 38 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 2Bh 1 Logical Unit Number Reserved 00h 2 MSB Transport Element Address 0000h 3 LSB 4 MSB Destination Element Address 5 LSB Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Position To Element 2Bh Bit Byte 7 6 5 4 3 2 1 5 6 Reserved 00h 7 8 Reserved 00h Invert
172. gged queuing extended contingent allegiance asynchronous event notification and error logging Quantum DX Series Software Interface Guide 185 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 141 Control Mode Page Format Descriptor Data Format Table 142 Control Mode Page Descriptor Field Descriptions 186 6 5 4 3 2 1 0 PS 0 0 Page Code OAh Page Length 06 Queue Algorithm Modifier 0 Reserved Reserved err 0 DQue 0 EECA 0 RAEN UAAE EAENP P 0 NP 0 Reserved Reserved Ready AEN Hold off Period 0 LSB Field Name Description PS Parameters Savable For MODE SELECT this bit must be 0 Page Length The Page Length field indicates the number of bytes in the Control Mode Page that follow this byte The valid value for this byte is 06h Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description RLEC Report Log Exception Condition When set to 1 specifies that the target will report log exception conditions When 0 specifies that the target will not report log exception conditions The RLEC bit works in conjunction with the READ WRITE Error Log Sense Page specifically the TMC bit of the READ WRITE Erro
173. gical Block Address LBA 2 3 Logical Block Address LBA LSB 4 Transfer Length Parameter List Length or Allocation Length 5 Control Quantum DX Series Software Interface Guide Table 72 Command Descriptor Block Field Descriptions Field Operation Code Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Note Unless otherwise specified all reserved bits indicated in the commands are 0 Description The operation code specifies the command being requested The list of supported SCSI commands and their operation codes are contained in table 70 Logical Unit Number The Logical Unit Number contains the number of the device being addressed It must be set to 0 The Logical Unit Number is ignored if the Command Descriptor Block is preceded by an IDENTIFY Message Logical Block Address Commands that require additional parameter data specify the length of the Logical Block Address that is needed See the specific command descriptions for more detailed information The drive does not support Relative Addressing it defaults to a value of 0 which specifies that the Logical Block Address specifies the first logical block of a range of logical blocks to be operated on by the command Relative Addressing indicates a technique used to determine the next Logical Block Address to be operated on Transfer Length The transfer length field normally specifies the number of
174. gies that use a fixed six byte Media Access Control MAC address Fibre Channel uses a three byte address identifier which is dynamically assigned during Login N_Ports transmit frames from their own Source_ID S_ID to a Destination_ID D_ID Addresses in the range of hex FFFFFO to hex FFFFFE are special well known addresses uses for such things as the Fabric Alias Server or the Multicast Server Before Fabric Login the N_Port s S_ID is undefined hex 000000 Hex FFFFFF is reserved for broadcast In a point to point topology Fabric Login will fail of course and the two ports will simply chose two unique addresses Quantum DX Series Software Interface Guide Appendix D Fibre Channel Topology Arbitrated Loop devices still use the three byte address identifiers but also use an Arbitrated Loop Physical Address AL_PA AL_PAs are one byte values dynamically assigned each time the Loop is initialized Once the Loop is initialized and hopefully each L_Port has selected an AL_PA public NL_Ports will attempt Fabric Login If there is an FL_Port the Fabric will assign the upper two bytes of the NL_Port s address identifier and usually allow the low byte to be the NL_Port s AL_PA If not the Loop will need to be re initialized so the NL_Port can select the Fabric assigned AL_PA If no Fabric exists or if an NL_Port is a private NL_Port does not login with the Fabric the upper two bytes of the address identifier will remain 0000
175. gth 0Dh 8 MSB 9 Command Specific Information Bytes 0h 10 11 LSB 12 Additional Sense Code 13 Additional Sense Code Qualifier 14 Field Replaceable Unit Code 00h SKSV 15 0 16 Reserved 17 18 Vendor Unique ASC 19 Vendor Unique ASCQ 20 Vendor Specific 76 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Request Sense 03h Bit Byte 7 6 5 4 3 2 1 0 21 Reserved 22 Reserved 23 Reserved Valid This field is set to 0 indicating that the field is not being used Segment Number Filemark EOM and ILI These fields are not supported and are set to 0 Error Code This error value is supported 70h current error Sense Key These Sense Key values are supported e Oh NO SENSE e 1h RECOVERED ERROR e 2h NOT READY e 4h HARDWARE ERROR e 5h ILLEGAL REQUEST e 6h UNIT ATTENTION e 9h VENDOR SPECIFIC Bh ABORTED COMMAND Information This field is not supported and is set to 0 SKSV Sense Key Specific fields are not supported and always set to 0 Additional Sense Length Additional Sense Code Additional Sense Code Qualifier Vendor Unique ASC and Vendor Unique ASCQ For a list of possible sense information returned from the DX Series system see Sense Key Values on page 279 Quantum DX Series Software Interface Guide 77 Chapter 2 Emulated Medium Changer SCSI Commands Request Sense 03h e Command S
176. gure 1 Read Element Status Data General Structure Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Read Element Status Data Read Element Status Data Header Element Status Data Page first or only Element Status Data Page Header Element Descriptor first or only Other Element Descriptors if any Other Status Data Pages if any A single Read Element Status Data Header is returned along with one or more element status pages The Read Element Status Data Header indicates the address of the first element reported number of elements reported and the report size for all requested data The report size is given in bytes e The size is the total number of bytes that would be contained in the report for all requested data minus 7 The Read Element Status command can be given with an Allocation Length of 8 to determine how much space must be allocated to transfer all status data requested by the command The format for the Read Element Status Data is shown in table 40 Quantum DX Series Software Interface Guide 57 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Table 40 Read Element Status Data 58 Bit Byte 7 6 5 4 3 2 1 0 0 MSB First Element Address Reported 1 LSB 2 MSB Number of Elements Reported 3 LSB 4 Reserved 00h 5 MSB 6 Byte Coun
177. h The following table illustrates the possible settings of the Selftst DevOfl and UnitOfl bits and the effects of each setting on the resulting self test Table 210 SEND DIAGNOSTIC CDB Selftst DevOfl UnitOfl Self Test Effect Bits Selftst DevOfl and UnitOfl 0 0 0 Illegal Combination 0 0 1 Self Test Level 3 with User Parameters 0 1 0 Illegal Combination 0 1 1 Self Test Level 2 with Default Parameters 1 0 0 Self Test Level 1 with Default Parameters 1 0 1 Self Test Level 2 with Default Parameters 1 1 0 Self Test Level 1 with Default Parameters 1 1 1 Self Test Level 2 with Default Parameters 260 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1Dh Table 211 SEND Bit Byte 7 6 5 4 3 2 1 0 DIAGNOSTIC Parameter List Data MSB Format 0 1 Pattern Number See Table 5 77 LSB MSB 2 3 Maximum Number of Test Passes LSB MSB 4 7 Block Size LSB MSB 8 11 Block Count LSB Quantum DX Series Software Interface Guide 261 Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1Dh Table 212 SEND DIAGNOSTIC Parameter List Field Descriptions 262 Field Name Description Pattern Indicates the type of data pattern to be used during Number the diagnostic tests Pattern Name Data in Hex 0 Rotate Rotate through the other 9 patterns 1 ALUS change for each 2 2F tape file
178. hat is rapidly emerging to challenge SCSI as the interface of choice for host to storage applications Fibre Channel advantages include e Connection distances up to 500 meters e lor 2Gbit S data transfer rates depending on host HBA e Supports up to 126 devices in loop mode e Supports 24 bit addressing for over 16 million devices in point to point mode or fabric when using a Fibre Channel switch or multiple Fibre Channel switches e Operating system independence e Interconnect flexibility This section also includes information on e Fibre Channel Topology e Fibre Channel Addressing Fibre Channel Fibre Channel topologies are divided into two types see figure 3 Topology Quantum DX Series Software Interface Guide 297 Appendix D Fibre Channel Topology Figure 3 Fibre Channel Topologies Fibre Channel Addressing 298 e Point to Point Fibre Channel device is connected directly to the Fibre Channel host e Arbitrated Loop multiple Fibre Channel devices are connected to a switch or hub in a Fibre Channel network or fabric Fibre Channel device p Point to Point Fibre Channel host Fibre Fibre Fibre Channel Channel Channel device rs device Fiber Channel switch or hub _ Fibre Fibre Fibre Channel Channel Channel device device device Arbitrated Loop or Fabric Unlike many LAN technolo
179. he DX Series system checks the state of the medium transport element gripper If there is a virtual tape cartridge in the medium transport element the inventory cannot be performed e If this is the case and the inventory was requested by the host then a check condition is set and Transfer Full GK 5 ASC 80 ASCQ 01 sense data is sent e If the inventory was not requested by the host the DX Series system generates a Transfer Full GK 5 ASC 80 ASCQ 01 on line initialization failure event Each element of the DX Series system is inventoried if it is the first inventory made since power on or issuing an Initialize Element Status command An inventory is attempted for each virtual tape drive present The results of the inventory are returned with the Read Element Status command Quantum DX Series Software Interface Guide 7 Chapter 1 Theory of Operation Operational Sequences Off Line Changing the DX Series system status to Off line through the web GUI causes the DX Series system to go off line When a DX Series system is placed off line this sequence is performed 1 The local controller for the DX Series system completes any currently processing command 2 When all commands are complete the web GUI displays System Off Line 3 The DX Series system generates a Unit Standby Button Was Pressed event SK 6 ASC 80 ASCQ 09 When the DX Series system is off line it responds to these commands e Inquiry e Request Sense e Log S
180. he Nth block or mark on the EOM or EOP side A value of 0 causes no change in logical position A negative value N two s complement notation causes reverse movement over N blocks or marks The tape is logically positioned on the BOM or BOP side of the Nth block or mark When spacing to EOD the Count field is ignored Forward movement occurs until the drive encounters EOD The position is such that a subsequent WRITE command would append data after the last object that has been written to tape before EOD When executing SPACE the tape drive implements the following hierarchy 266 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Space 11h Highest BOM P or EOM P EOD Filemarks Lowest Blocks Note that a space sequential filemarks is a space to the first occurrence of n filemarks written sequentially A SPACE command in the form SPACE N blocks will halt with GOOD status after the Nth block or with CHECK CONDITION status on any occurrence of Filemark EOD BOM P or EOM P A command SPACE N Filemarks will halt on the Nth Filemark with GOOD status on any occurrence of EOD BOM P or EOM P Depending on the size of blocks read ahead data in the buffer allows some spacing requests to be satisfied without actual tape movement Quantum DX Series Software Interface Guide 267 Chapter 3 Emulated DLT7000 SCSI Commands Test Unit Ready 00h T
181. he Page Format field indicates the Mode Select Parameters are formatted as specified in the SCSI 2 specification Parameter List Length 32 Quantum DX Series Software Interface Guide Table 26 Mode Select Data Vendor Unique Page 20h Chapter 2 Emulated Medium Changer SCSI Commands Mode Select 15h The PLL field indicates the length of the parameter list The list length should reflect the combined length of all data pages being sent with the Mode Select command Mode Select Data pages are shown in table 26 table 27 and table 28 The format for Mode Select Vendor Unique Page 20h is shown in table 26 Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 Rsvd 0 Page Code 20h 1 Page Length 02h 2 Reserved 00h SER 1 AC DLR 3 Reserved 00h ADU EXB 0 PS Parameters Savable This bit is only used with the Mode Sense command This bit is reserved for Mode Select command and should be set to 0 DLR Drive Load Retry This bit is ignored It can be set to 1 or 0 for compatibility with hosts SER This bit enables Drive Serialization which enables the reporting of drive serial numbers in the Alternative Volume Tag AVoltag field of the drive Read Element Status The default setting is Enabled Note This must always be set to 1 Any attempt to disable this bit will result in a check condition 05 26 00 AC Auto Clean When this bit is set to 1 automatic drive cleaning feature is en
182. he example of Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands SCSI Command Descriptions the Parameter List Length field bytes 7 and 8 of the Log Select command shown below Bit Byte 7 6 5 4 3 2 1 0 Bytes 0 6 MSB 7 8 Parameter List Length LSB As shown this sample indicates that the most significant bit MSB of the field is bit 7 of byte 7 the least significant bit is bit 0 of byte 8 This is an alternate shorthand presentation for Bit Byte 7 6 5 4 3 2 1 0 Bytes 0 6 MSB Parameter List Length 8 LSB The shorthand version of presentation is used in this manual due to space constraints Quantum DX Series Software Interface Guide 121 Chapter 3 Emulated DLT7000 SCSI Commands Erase 19h Erase 19h Table 77 ERASE COMMAND Descriptor Block Data Format 122 The ERASE command causes data on the tape medium to be erased Any WRITE data currently held in buffer memory and not yet written to tape is written to tape before the ERASE command is executed ERASE command must be issued while at BOT Note that the time for a complete erase of a DLTtape IV tape cartridge can be well over one hour Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 19h 1 Logical Unit Number Reserved Tamed a 2 4 Reserved 5 Unused Reserved Flag 0 Link 0 Qua
183. he header Bit Byte 7 6 4 3 1 0 0 Reserved MSB 1 3 Available Length LSB 2 Buffer ID MSB 3 5 Buffer Offset LSB MSB 6 8 Allocation Length LSB 9 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide Table 186 READ BUFFER Header Field Descriptions Data Mode Descriptor Mode Table 187 READ BUFFER Descriptor Data Format Chapter 3 Emulated DLT7000 SCSI Commands Read Buffer 3Ch Field Name Description Available This field specifies the total number of data bytes Length available in the target s buffer This number is not reduced to reflect the allocation length nor is it reduced to reflect the actual number bytes written using the WRITE BUFFER command Following the READ BUFFER header the target transfers data from its data buffer In this mode the DATA IN phase contains only buffer data In this mode a maximum of four bytes of READ BUFFER descriptor information is returned The tape drive returns the descriptor information for the buffer specified by the Buffer ID In this mode the drive does not reject the valid Buffer IDs with a CHECK CONDITION status but returns all zeros in the READ BUFFER descriptor The Offset Boundary is 12 OCh indicating that buffer offsets should be integral multiples of 4 K Bit Byte 7 6 5 4 3 2 1 0 0 Offset Boundaries OCh MSB 1 3 Buffer
184. he immed bit is accepted but ignored in processing BC Byte Check When set to 0 the tape drive performs an internal CRC ECC check of data No data is transferred to the initiator When set to 1 the command is rejected Quantum DX Series Software Interface Guide 269 Chapter 3 Emulated DLT7000 SCSI Commands Verify 13h Field Name Description Fixed This bit specifies whether fixed length or variable length blocks are to be verified When set to 0 variable block mode is requested A single block is transferred with the Verification Length specifying the maximum number of bytes the initiator has allocated for verification When the Fixed bit is set to 1 the Verification Length specifies the number of blocks to be verified This is valid only if the logical unit is currently operating in Fixed Block mode Verification Length This field specifies the amount of data to verify in blocks or bytes as indicated by the Fixed bit 270 Quantum DX Series Software Interface Guide Write OAh Table 220 WRITE Command Descriptor Block Data Format Chapter 3 Emulated DLT7000 SCSI Commands Write OAh The WRITE command transfers one or more blocks from the host to the current logical position When in Buffered Mode the DLT tape drive default mode the tape drive reports GOOD status on WRITE commands as soon as this data block has been transferred to the data buffer Any check conditions will be exp
185. he medium is already unloaded no action is taken A good status is returned EOT End of Tape This bit is ignored by the tape drive unless both the EOT and Load bits are set to 1 then the drive returns CHECK CONDITION ILLEGAL REQUEST data Servo Firmware Checksum Servo Firmware checksums are given as binary numbers and are for positive firmware and EEPROM identification Quantum DX Series Software Interface Guide 145 Chapter 3 Emulated DLT7000 SCSI Commands Load Unload 1Bh Field Name Flag Bit Description The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient manner that a command has been completed Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LLNKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system 146 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Locate 2Bh Loca
186. he number of tape motion ie Hours head wear hours Format is given as a hexadecimal word 2 bytes Power On This field reports the total number of hours that Hours drive power has been applied since its last power on cycle not total power on hours over the device s lifetime Format is given as a hexadecimal longword 4 bytes Tape This field reports the amount of tape remaining in 4 Remaining KB 4096 bytes blocks Table 2 Soe eea a Field Name Description Sense Keys Oh NO SENSE Check the Filemark EOM ILI bits and the Additional Sense Code Additional Sense Code Qualifier bytes 1h RECOVERED ERROR This can be caused by rounding of Mode Parameters on a MODE SELECT or may report that READ WRITE error rates are reaching subsystem specification limits for optimal operation The device may still be able to continue to function without any unrecovered errors for a long period of time however No CHECK CONDITION is generated unless the PER bit of Mode Page 01h is set 2h NOT READY The tape medium is not ready for tape operation commands Tape medium might not be present in the drive or may be in the process of loading or calibrating 3h MEDIUM ERROR An unrecoverable WRITE READ or positioning error has occurred Detailed device specific information may be available 252 Quantum DX Series Software Interface Guide Field Name 4h Chapter 3 Emulated DLT7000 SCSI Commands Request Sense 03h
187. he parameter code specified in the Parameter Pointer field Bytes 5 6 and return the number of bytes specified in the Allocation Length field Bytes 7 8 in ascending order of parameter codes from the specified log page Note that the current implementation of the READ WRITE COMPRESSION page does not support a PPC other than 0 If PPC bit is set then the target terminates the command with CHECK CONDITION status sense key set to ILLEGAL REQUEST and additional sense code set to INVALID FIELD IN CDB SP Save Parameters Not supported must be set to 0 If for some reason the Save Parameters bit is set the command terminates with aCHECK CONDITION status with a sense key of ILLEGAL REQUEST and an ASC of INVALID FIELD IN CDB PC Page Control This field defines the type of parameter values to be returned PC Type of Parameter Values 00b Threshold Values 01b Cumulative Values 10b Default Threshold Values 11b Default Cumulative Values The Default Threshold Values are the maximum values that each parameter can attain The Current Cumulative Values are the values computed since the last reset of the device either via power cycle BUS DEVICE RESET or SCSI RESET The Default Cumulative Values are the values to which each parameter is initialized at a reset condition Default values are zero By default Current Threshold Values Default Threshold Values Note that all types of parameter values are changeabl
188. iator if a READ or WRITE command is issued Last Block The block address associated with the current Location physical position the next block to be transferred to tape medium and from the target s buffer If the buffer is empty or has only a partial block the same value as First Block Location is reported The first block or filemark written onto the tape medium is at address 0 Number of The number of data blocks in the target s buffer Bytes in Buffer Number of The number of data bytes in the buffer that have not Bytes in been written to the tape medium Buffer Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Receive Diagnostic Results 1Ch Receive Diagnostic Results 1Ch Table 192 RECEIVE DIAGNOSTIC RESULTS Command Descriptor Block Data Format Table 193 RECEIVE DIAGNOSTIC RESULTS Command Data Field Descriptions The RECEIVE DIAGNOSTIC RESULTS command fetches the results of the last SEND DIAGNOSTIC command sent to the tape drive Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 1Ch 1 Logical Unit Number Reserved 2 Reserved MSB 3 4 Allocation Length LSB 5 Unused Reserved Flag 0 Link 0 Field Name Description Allocation Specifies the number of bytes of diagnostic page Length results the drive is allowed to send to the initiator The following data is returned by the drive as a
189. idge into the DX Series system This field is always set to 1 because imports are possible through that element Import Enable The Import Enable field indicates if the element can export a tape cartridge from the DX Series system It is set to 1 Export Enable The Export Enable field indicates whether the element can export a tape cartridge from the DX Series system It is set to 1 Access e An access bit value of 1 indicates access to the element by a medium transport element is allowed e This is set to 0 if the load port door is open or if a load pack has been removed Except e When the element is in a normal state it is set to 0 e When the element is in an abnormal state it is set to 1 Quantum DX Series Software Interface Guide 65 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields in that element descriptor Appendix A Sense Key Values for the meaning of the codes contained in the two Sense Code fields Import Export e The Import Export field is set to 0 if the tape cartridge contained in the element was placed there by the transfer mechanism e Itis set to 1 if the tape was placed there by an operator or if its source is unknown e g after power cycle e Full e The Full field is set to 1 whenever the element contains a tape cartridge e It is set to 0 when
190. ield is DLT7000 there is spaces after the word DLT7000 128 Quantum DX Series Software Interface Guide Field Name Value Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Description Product Revision Level This field contains 4 bytes of ASCII data that provides the drive s software revision levels The first two bytes are the version number of servo code The second two bytes are the version number of the SCSI read write code When a firmware update is performed on the DLT drive this part of the revision level will change to reflect that update quotation marks will not appear Tech Tip The product revision number for the D X Series system is Revision Level 2769 Vendor Specific Vendor Unique Inquiry Data Table 83 INQUIRY Vendor Unique Bytes Definitions The following information can be used to precisely identify the revision of subsystem components Bit Byte 7 6 5 4 3 2 1 0 36 Product Family 7 Released Firmware 37 Firmware Major Version 38 Firmware Minor Version 39 EEPROM Format Major Version 40 EEPROM Format Minor Version 41 Firmware Personality 42 Firmware Sub Personality 43 Firmware Subtype 44 Controller Hardware Version 45 Drive EEPROM Version 46 Drive Hardware Version Quantum DX Series Software Interface Guide 129 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h 130
191. in the initiator at one time The current pointers point to the next command data or status byte to be transferred between the initiator s memory and the drive The saved and current pointers reside in the initiator The saved command pointer always points to the start of the Command Descriptor Block for the I O process The saved status pointer always points to the start of the status area of the I O process The saved data pointer always points to the start of the data area until the drive sends a SAVE DATA POINTER message for the I O process back to the initiator In response to the SAVE DATA POINTER message the initiator stores the value of the current data pointer into the saved data pointer for that I O process The drive can restore the current pointer from the saved pointer value for the active I O process by sending a RESTORE POINTERS message to the initiator The initiator then copies the set of saved pointers into the set of current pointers Whenever a drive disconnects from the SCSI Bus only the set of saved pointers is retained in the initiator The set of current pointers is restored from the set of saved pointers when the I O process is reconnected The DX Series system supports the SCSI 2 soft reset option When a SCSI bus reset occurs the library clears the SCSI bus as described in the SCSI 2 Specification Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 07h MSB 1 Logical Unit Number Lo
192. indicates no loader present Non zero indicates loader is present Quantum DX Series Software Interface Guide 131 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Field Name Library Present Description Set to 0 indicates no library present Non zero indicates library is present Module Revision A four byte ASCII string representing the revision level of the tape drive s module the controller PCBA attached to the tape drive Supported Vital Product Data Page 132 The Supported Vital Product Data Pages page see table 85 provides a directory of the Vital Product Data Pages that are supported by the drive The pages that are supported are e The Unit Serial Number Page 80h e The Device Identification Page 83h e The Firmware Build Information Page COh e The Subsystem Components Revision Page C1h Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Table 85 Supported Bit Byte 7 6 5 4 3 2 1 0 Vital Product Data Pages Page Data 0 Peripheral Qualifier Peripheral Device Type Format 1 Page Code 00h 2 Reserved 3 Page Length 5 4 00h this page 5 80h Unit Serial Number Page 6 83h Device Identification Page 7 COh Firmware Build Information Page 8 Clh Subsystem Components Revision Page Table 86 Unit Serial Bit Byte 7 6 5 4 3 2 1 0
193. ines the SCSI Logical Block Address to which the media will be positioned These addresses start at address 0 and include data blocks and filemarks They could also be considered an object address Command Descriptor Field Name Block Field Descriptions BT CP Immed Block Address Partition Not applicable see Change Partition field above 148 Quantum DX Series Software Interface Guide Log Select 4Ch Chapter 3 Emulated DLT7000 SCSI Commands The LOG SELECT command allows the host to manage statistical information maintained by the tape drive about its own hardware Log Select 4Ch parameters or about the installed tape medium The description should be read in conjunction with the description of the LOG SENSE command that follows it and provides the user with information about log page format parameters and supported pages Table 103 LOG Bit Byte 7 6 5 4 3 2 1 0 SELECT Command Descriptor Block 0 Operation Code 4Ch Data Format 1 Logical Unit Number Reserved PCR SP 0 2 PC Reserved 3 6 Reserved MSB 7 8 Parameter List Length LSB 8 Partition 9 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide 149 Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Table 104 LOG Description Parameter Code Reset If this bit is set to 1 and the parameter list length is set to 0 all accumulated values of p
194. initialize parameters within the logs supported by the tape drive There are two ways to initialize the log parameters 1 Set the PCR bit in the LOG SELECT CDB this clears all parameters 2 Specify the log page and parameter values as the log parameters to clear individual pages The following pages can be cleared using this method Page Code Page Description 02h Writer Error Count Page 03h Read Error Count Page 32h Compression Ratio Page Quantum DX Series Software Interface Guide Log Select Page Format Table 105 LOG SELECT Log Page Header Format Table 106 LOG SELECT Log Page Header Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch If multiple pages are sent during the DATA OUT phase they must be sent in ascending order according to page code Otherwise the command terminates with a CHECK CONDITION status sense key set to ILLEGAL REQUEST and additional sense code set to INVALID FIELD IN PARAMETER LIST The same status is returned if an unsupported Page Code appears in any header or if the specified page cannot be cleared Each log page begins with a 4 byte header followed by n number of log parameter blocks one block for each parameter code Each block except for parameter code 05h is comprised of 8 bytes The parameter block for code 05h is 12 bytes Bit Byte 7 6 5 4 3 2 1 0 0 Reserved Page Code 1 Reserved MSB 2 3 Page Leng
195. ions 228 Field Name Prevent Description The PREVENT ALLOW status in the device is maintained separately by each initiator When set to 0 the prevent state corresponding to that initiator is cleared When all initiators have cleared their prevent states the UNLOAD button and UNLOAD commands are enabled By default after power up a hard reset or Bus Device Reset message the prevent medium removal function is cleared If a Media Loader device is present its MOVE MEDIUM command is prevented from removing a cartridge if PREVENT has been enabled Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient manner that a command has been completed Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Comma
196. ions PS Field Name Description Parameters Savable Must be 0 the supported parameters cannot be saved savable pages are not supported Additional Page Length This field indicates the number of bytes in the page Note that this value does not include bytes 0 and 1 The length is returned on MODE SENSE and must subsequently be set to the same value when performing MODE SELECT TB Transfer Block The Transfer Block when not fully recovered function is not supported EER Enable Early Recovery This function is always enabled must be 1 PER Parity Error This bit enables reporting of CHECK CONDITION for recovered READ WRITE errors Default is 0 DTE DCR Disable Transfer on Error Set to 0 This feature is not supported Disable ECC Correction Bit Set to 0 This feature is not supported READ Retry Count This field reports the maximum number of re reads that are attempted before declaring an unrecoverable error WRITE Retry Count This field reports the maximum number of overwrite retries that are attempted before declaring an unrecoverable error Continued on next page 212 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah DISCONNECT RECONNECT Page 02h The tape drive supports the DISCONNECT RECONNECT Page The format for the page is illustrated in the following figure
197. iptor Length 00h e Mode Data Length Field is set to the data amount following the Data Length field in bytes This includes the last 3 bytes in the header block as well as all bytes in the parameter page or pages e Medium Type Code Field is reserved for medium changer devices Quantum DX Series Software Interface Guide 41 Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah Table 32 Mode Sense Data Vendor Unique Page 00h 42 e Device Specific Parameter Field is reserved for medium changer devices e Block Descriptor Length Field is reserved for medium changer devices The format for Mode Sense Vendor Unique Page 00h is shown in table 32 Bit Byte 7 6 5 4 3 2 1 0 0 PS 1 a Page Code 00h 1 Page Length 3Eh 2 Ahit ma Ey NBL ti 2a MDC 0 3 Maximum Parity Retries 00h 4 63 Display Messages 00h PS Parameters Savable This bit is always set to 1 indicating this page can be saved to nonvolatile memory Alnit e When this value is set to 1 the DX Series system insures all elements have been inventoried before entering the on line state e If set to 0 the DX Series system only inventories itself when commanded by a Init Element Status or Init Element Status with Range command e Ulnit Not supported e Parity Not supported Quantum DX Series Software Interface Guide Table 33 Mode Sense Data Element Address Assign Page Chapter 2 E
198. is the block length defined in the MODE SELECT command Upon termination the tape is logically positioned after these blocks Transfer This field contains the length of the data transfer in Length bytes or blocks depending on whether Fixed or Variable block mode is selected When the Transfer Length is 0 no data is transferred and the current position on the logical unit is not changed If End of Tape EOT is detected while writing the tape drive finishes writing any buffered data The command terminates with CHECK CONDITION status Within the sense data the EOM bit is set the Sense Key is set to NO SENSE and the Additional Sense code and Additional Sense Code Qualifier fields are set to EOM P detected The drive attempts to complete any subsequent writes returning a CHECK CONDITION status in each case Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Write OAh If the tape drive encounters the physical End of Medium EOM when attempting WRITE a CHECK CONDITION status is returned Within the sense data the EOM and Valid bits are set and the Sense Key field is set to Volume Overflow The Information fields contain the residue count and the Additional Sense code and Additional Sense Code Qualifier fields are set to EOM P Detected The tape is physically positioned at EOM P Quantum DX Series Software Interface Guide 273 Chapter 3 Emulated DLT7000 SCSI Commands Write Buffer 3
199. is can be caused by rounding of Mode Parameters on a MODE SELECT or may report that READ WRITE error rates are reaching subsystem specification limits for optimal operation The device may still be able to continue to function without any unrecovered errors for a long period of time however No CHECKCONDITION is generated unless the PER bit of Mode Page 01h is set 2h NOT READY The tape medium is not ready for tape operation commands Tape medium might not be present in the drive or may be in the process of loading or calibrating Quantum DX Series Software Interface Guide 279 Appendix A Sense Key Values Sense Key Message Name Description 3h MEDIUM ERROR An unrecoverable AWRITE READ or positioning error has occurred Detailed device specific information may be available 4h HARDWARE ERROR The Additional Sense Code Additional Sense Code Qualifier fields may present more specific information 5h ILLEGAL REQUEST The Command Descriptor Block or supplied parameter data had an unsupported or illegal operation specified Check bytes 15 16 and 17 6h UNIT ATTENTION Unit Attentions are created after a device reset if the medium asyn chronously becomes ready to the initiator if another initiator changes Mode Parameters and or if the firmware is updated 7h DATA PROTECTED The current tape medium is write protected This can be because the Write Protect switch on the cartridge is in its enabled position or if the
200. is set to 0 Invert The Invert field is not supported and is set to 0 Source Storage Element Address Source Storage Element Address represents the address of the last storage element that held the cartridge The SValid field indicates whether this information is valid Primary Volume Tag Information If the Volume Tag information is requested in the command block VolTag 1 then the Primary Volume Tag Information field is included in the element descriptor For format see table 43 The layout of an element descriptor for an element of the import export element type is illustrated in table 45 Table 45 Import Export Bit Byte 7 6 5 4 3 2 1 0 Element Descriptor 0 MSB Element Address 1 LSB Import Export Import 2 Reserved 0 Enable Enable Access Except Export Full 3 Reserved 00h 4 Additional Sense Code 5 Additional Sense Code Qualifier 6 7 Reserved 000000h 8 64 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Bit Byte 7 6 5 4 3 2 1 0 9 SValid ies Reserved 00h 10 Source Storage Element Address 11 12 47 Primary Volume Tag Information Field omitted if PVolTag 0 48 51 Reserved 00000000h 52 Vendor Unique 0000h 53 Import Element The Import Enable field indicates if the element can import a tape cartr
201. ize Element Status command is then issued the inventory process is restarted from the beginning The format for this command data block is shown in table 8 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code E7h 1 Logical Unit Number Reserved 00h Range 2 MSB Starting Element Address 3 LSB 4 Reserved 00h 5 Reserved 00h 6 MSB Number of Elements 7 LSB 8 Reserved 00h 9 NBL Reserved 00h Logical Unit Number The Logical Unit Number must be set to 0 Field indicates the logical unit to which the command is sent Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Initialize Element Status with Range E7h Range e Range value of 1 specifies performing the inventory over the range specified by the Starting Element Address and Number of Elements fields e A value of 0 specifies performing the inventory on all elements in the DX Series system ignoring the Starting Element Address and Number of Elements fields Starting Element Address and Number of Elements e These fields select the range of elements to be inventoried and are only valid when Range value is 1 e The inventory range begins with the first element with an address greater than or equal to the Starting Element Address and includes all defined elements until the indicated number of elements have been inventoried or the last element is reached NBL e A
202. l responses Tape motion commands will be returned with Check Condition status Sense Key Not Ready until the tape medium has been made ready e The tape drive implements the hard bus reset option e The tape medium is rewound to Beginning of Tape BOT Quantum DX Series Software Interface Guide Data Cache and Tape Write Interaction Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing The DLT7000 system tape drive recognizes multiple successive SCSI bus resets and SCSI bus resets of arbitrarily long duration The tape drive recovers within the time limits specified above following the last SCSI bus reset The tape drive goes through a calibration process at power up and loading of medium The Quantum DLT7000 system tape drive contains a data cache that buffers blocks records until they are written to tape This section describes when those blocks are written or flushed to tape A Mode Select parameter allows the data cache to be disabled unbuffered mode In this mode every WRITE command causes data to be written to the tape medium before the STATUS byte and the COMMAND COMPLETE message are returned to the host Note Unbuffered mode is NOT recommended due to the poor performance that may result The contents of the write data cache are written to the tape medium under the following circumstances e When two or more WRITE FILEMARKS commands are issued without intervening tape m
203. letes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Tech Tip Link bits are not supported by the DX Series system Status Error Reporting SCSI message level errors are communicated by messages that are defined specifically for that purpose for example MESSAGE PARITY ERROR MESSAGE REJECT Message level errors are also handled by drive managed retries Refer to Chapter 4 for more detailed message handling information SCSI command level errors are communicated by a status code that is returned by the drive during the STATUS phase This phase occurs at the end of each command unless the command is terminated by one of the following events e ABORT message BUS DEVICE RESET message e Hard reset condition Quantum DX Series Software Interface Guide 113 Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing e Unexpected disconnect The status code is contained in bits 1 through 5 of the status byte Bits 0 6 and 7 are reserved Table 75 describes the status codes returned by the drive Note In contrast to the BUSY status condition the DRIVE NOT READY Sense Key is returned as part of the Sense data following a REQUEST SENSE command and indicates that a media access command has been issued and the medium is not ready to be accessed For example the medium is not installed the medium has been unloaded and the drive is curre
204. m DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Export Enable The Export Enable field indicates whether the element can export a tape cartridge from the DX Series system It is set to 1 01h Access e An access bit value of 1 indicates access to the element by a medium transport element is allowed e This is set to 0 Oh if the load port door is open Except e When the element is in a normal state it is set to 0 e When that element is in an abnormal state it is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields in that element descriptor for the meaning of the codes contained in the 2 Sense Code fields see Appendix A Sense Key Values Import Export e The Import Export field is set to 0 if the tape cartridge contained in the element is placed there by the transfer mechanism e Itis set to 1 if the cartridge is placed there by an operator or if its source is unknown e g after power cycle Full e The Full field is set to 1 whenever the element contains a tape cartridge e It is set to 0 when the element contains no tape or the load port door is open Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to one Currently the only valid values for these fields indicate e Element Contents Unknown con
205. m and tape drives which act as SCSI targets e SCSI target support does not perform any initiator functions each DX Series system has its own SCSI address separate from any other SCSI devices including the tape drives Quantum DX Series Software Interface Guide 9 Chapter 2 Emulated Medium Changer SCSI Commands Support asynchronous SCSI Is intended for use with iSCSI 10 100 1000Mbit sec initiators for DX3000 and DX5000 e Fully support RFC 3720 with error handling level 0 1 or 2 Gb s initiators for Fibre Channel initiators for DX30 and DX100 optional on DX3000 and DX5000 Does not support SCSI queuing or linked commands all element addresses must be specified absolutely no relative addressing is permitted Change Definition command Asynchronous event notification Extended contingent allegiance Overlapped command support if this command is received from the same host the DX Series system aborts the previous command and returns a check condition with Overlapped Commands Attempted sense data code GK 5 ASC 54 ASCQ 00 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Supported Operational Commands Supported Operational Commands The DX Series system supports all commands that the SCSI 2 specification indicates are required by all devices a Command Name OperCode Type E Initialize Element Status 07h Optional Initi
206. ment This guide is organized as follows Organization m SFT F g e Chapter 1 Theory of Operation explains medium changer elements events operational sequences configuration error recovery system performance and diagnostic support issues e Chapter 2 Emulated Software Interfaces describes SCSI 2 terminology in relation to the DX Series enhanced data protection system This includes required and optional SCSI 2 messages and operational commands e Chapter 3 Emulated DLT7000 SCSI Commands describes SCSI terminology in relation to the DLT7000 tape drive This includes required and optional SCSI 2 messages and operational commands e Appendix A Sense Key Values provides information on the supported sense keys for request sense e Appendix B Media Changer Sense Code Values provides sense code values for the medium changer e Appendix C DLT7000 Sense Code Values provides sense code values for the DLT7000 tape drive e Appendix D Fibre Channel Topology provides an overview of Fibre Channel topology available with the DX30 and DX100 and as an option with DX3000 and DX5000 e Appendix E DX Series Software Deviations provides an overview of the implemented changes to the DX Series software e This guide concludes with a glossary and an index xxii Quantum DX Series Software Interface Guide Notational Conventions Preface This manual uses the following conventions Caution Caution
207. mulated Medium Changer SCSI Commands Mode Sense 1Ah NBL No Bar Code Labels e Field is valid only if the Alnit field value is 1 when the DX Series system performs an inventory due to going on line and NBL field is 1 bar codes are not scanned and primary volume tags are set to empty e If this field is set to 0 when the DX Series system performs an inventory due to going on line bar codes are scanned and their value placed in the corresponding primary volume tag e NRDC Not Ready Display Control Not supported MDC Message Display Control Not supported Maximum Parity Retries Not supported e Display Message Not supported The format for the Element Address Assignment Page is shown in table 33 Bit Byte 7 6 5 4 3 2 1 0 0 PS 1 via Page Code 1Dh 1 Parameter Length 12h 2 MSB First Medium Transport Element Address 3 LSB 4 MSB Number of Medium Transport Elements 0001h 5 LSB 6 MSB First Storage Element Address 7 LSB Quantum DX Series Software Interface Guide 43 Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah Bit Byte 7 5 4 3 2 0 8 MSB Number of Storage Elements 9 LSB 10 MSB First Import Export Element Address 11 LSB 12 MSB Number of Import Export Elements 13 LSB 14 MSB First Data Transport Element Address 15 LSB 16 MSB Num
208. n Page Data Format 217 Data Compression Page Field Descriptions 0 0 00 217 Quantum DX Series Software Interface Guide xvii Tables xviii Table 170 Table 171 Table 172 Table 173 Table 174 Table 175 Table 176 Table 177 Table 178 Table 179 Table 180 Table 181 Table 182 Table 183 Table 184 Table 185 Table 186 Table 187 Table 188 Table 189 Table 190 Table 191 Table 192 Device Configuration Page Data Format 219 Device Configuration Page Field Descriptions 220 Medium Partition Page Data Format eee 222 Medium Partition Page Field Descriptions c0 223 TapeAlert Page Format Descriptor Data Format 224 TapeAlert Page Format Descriptor Field Descriptions 224 PREVENT ALLOW MEDIUM REMOVAL Command Descriptor Block Data Format eessesssesseseeeneneeeneees 227 PREVENT ALLOW MEDIUM REMOVAL Command Descriptor Block Field Descriptions 0 teens 228 READ Command Descriptor Block Data Format 229 READ Command Descriptor Block Field Descriptions 230 READ BLOCK LIMITS Command Descriptor Block Data Formatie aiino meteri ir marii E A Macticcntesiebe 232 READ BLOCK LIMITS Data Data Format cee 232 READ BLOCK LIMITS Data Field Descriptions 233 READ BUFFER Command Descriptor Block Datta Format ieres seereis skisis reor cones us saps SOUSA ESE NEKE EnS 234 READ
209. ndicates the entity that the identification descriptor describes If a physical or logical device returns the identification descriptor with the association field set to Oh it shall return the same descriptor when it is accessed through any other path Bit Byte 7 6 5 4 3 2 1 0 0 Reserved Code Set 1 Reserved Association Identifier Type 2 Reserved 3 Identifier length n 3 4 MSB Identifier n LSB e Code set The code set field specifies the code set used for the identifier field as described in table 90 This field is intended to be an aid to software that displays the identifier field Value Description Oh Reserved 1h The identifier field shall contain binary values 2h The identifier field shall contain ASCII graphic codes e g code values 20h through 7Eh 3h Fh Reserved e Association Quantum DX Series Software Interface Guide 135 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h The association field specifies the entity with which the identifier field is associated as described in table 91 Table 91 Association Value Oh Description The identifier field is associated with the addressed physical or logical device 1h The identifier field is associated with the port that received the request 2h 3h Reserved e Identifier Type The identifier type is described in table 92 Table 92 Identifier Type
210. nds Mode Select 6 10 15h 55h Bit Byte 7 6 5 4 3 2 1 0 4 Write Buffer Full Ratio 5 Read Buffer Empty Ratio MSB 6 7 Write Delay Time LSB 8 DBR 0 BIS RSmk AVC SOCF 0 RBO 0 REW 0 0 9 Gap Size 0 10 EOD Defined 0 EEG SEW Reserved 1 MSB 11 13 Buffer Size at Early Warning 0 LSB 14 Select Data Compression Algorithm 15 Reserved Quantum DX Series Software Interface Guide 191 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Table 146 Device Configuration Page Field Name Description Field Descriptions 192 PS Parameters Savable For MODE SELECT this bit must be 0 Additional Page Length This field indicates the number bytes in the page However the value does not include bytes 0 and 1 The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT If the page length does not match that expected by the drive a CHECK CONDITION status is returned sense key set to ILLEGAL REQUEST The drive returns a CHECK CONDITION status with sense key set to ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field with values not supported or changeable In such cases no parameters are changed as a result of the command CAP Change Active Partition Not supported must be 0 CAF Change Active
211. nds Read 08h Read 08h This command transfers one or more data blocks or bytes to the initiator starting with the next block on the tape Table 178 READ Bit Byte 7 6 5 4 3 2 1 0 Command Descriptor Block Data Format 0 Operation Code 08h 1 Logical Unit Number Reserved SILI Fixed MSB 2 4 Transfer Length LSB 5 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide 229 Chapter 3 Emulated DLT7000 SCSI Commands Read 08h Table 179 READ Command Descriptor Block Field Descriptions Field Name SILI Description Suppress Incorrect Length Indicator If the SILI bit is set to 1 and the Fixed bit is set to 1 the target terminates the command with CHECK CONDITION status sense key set to ILLEGAL REQUEST and additional sense code of INVALID FIELD IN CDB If the SILI bit is 0 and the actual block length is different than the specified transfer length a CHECK CONDITION status is returned Within the sense data the Incorrect Length Indicator ILI bit and Valid bit will be set to 1 The sense key field specifies NO SENSE The information bytes are set to the difference residue between the requested transfer length and the actual block length or in Fixed Block mode the difference residue between the requested number of blocks and the actual number of blocks read No more than transfer length blocks are transferred to the initiator
212. nents 115 INQUIRY 124 Status error reporting 113 SCSI II specification xxiv SCSI 2 terms 9 Send diagnostic command 100 Send volume tag command 102 104 Sense data values DLT7000 290 media changer 282 Sense key values 279 T Test unit ready command 105 Transport element 3 Using 2 Quantum DX Series Software Interface Guide 319 320 Quantum DX Series Software Interface Guide
213. nexpected Unexplained Residue Count in Transfer Register 44 85 Immediate Data Transfer Timeout 44 86 Insufficient CDB Bytes 44 87 Disconnect Sequence Failed 44 88 Bus DMA Transfer Timeout 44 89 Command Cleared from Queue Without Other 44 8A Over Temperature Condition 44 C1 EEROM Copy 1 Area Bad 44 C2 EEROM Copy 2 Area Bad 44 C3 Both EEROM Copy Areas Bad 45 00 Select Reselect Failure 47 00 SCSI Parity Error check SCSI bus configuration and connections 48 00 IDE Message Received 49 00 Invalid Message Error 4B 00 Data Phase Error 4E 00 Overlapped Commands Attempted queue tag is not unique CDB sent with abort tag message or untagged or untagged CDBs are outstanding 51 00 Erase Failure Quantum DX Series Software Interface Guide 293 Appendix C DLT7000 Sense Code Values ASC ASCQ Description 53 00 Media Load Eject Failure 53 01 Unload Tape Failure 53 02 Media Removal Prevented 5A 01 Operator Media Removal Request 5B 01 Log Threshold Condition Met 5B 02 Log Counter at Maximum 5D 00 Tape Alert Failure Prediction Threshold Exceeded 5D FF False Exception Condition 80 00 Calibration Error use cleaning tape 80 01 Cleaning Required use cleaning tape 80 02 Cleaning Requested use cleaning tape 81 00 Directory Read Error use cleaning tape 82 00 Not Allowed if not at BOT 82 01 LUN Communications Time out 83 00 Can not Retry Read Write Data Trans
214. ngth 4 LSB 5 Reserved 00h e Logical Unit Number The Logical Unit Number must always be set to 0 This field indicates the logical unit to which the command is sent PF A page format bit of one specifies that the Send Diagnostic parameters conform to the page structure as specified in the SCSI 2 specification This bit must be set to 1 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Send Diagnostic 1Dh Self Test DevOfL and UnitOfL Table 66 illustrates how the Seltst DevOfl and UnitOfl bits determine which test to be performed raine 6 SeltestBt Selftst DevOfl UnitOfI Selftest Action 0 0 0 Illegal Combination 0 0 1 No Op 0 1 0 Ilegal Combination 0 1 1 No Op 1 0 0 Selftest 1 1 0 1 Selftest 2 1 1 0 No Op 1 1 1 Selftest 2 These tests verify that all major DX Series system subsystems are working as follows Tech Tip The following tests are not supported by DX Series system A good status will always be returned when queried e Electronics Self Test Selftest 1 Performs tests such as CPU Functionality Buffer RAM Integrity and ROM Checksum This test does not move any mechanical components e Functionality Test Selftest 2 Quantum DX Series Software Interface Guide 101 Chapter 2 Emulated Medium Changer SCSI Commands Send Volume Tag B6h Send
215. nit reserves the logical unit for the SCSI device specified in the 3rd party device ID field e The DX Series system preserves the reservation until any 1 of the 4 conditions mentioned occurs e The DX Series system ignores any attempt made by any other initiator to release the reservation and returns a Good status Quantum DX Series Software Interface Guide Table 63 Element List Descriptor Chapter 2 Emulated Medium Changer SCSI Commands Reserve 16h e An initiator that holds a current reservation may modify that reservation for example to switch third parties by issuing another Reserve Unit to the DX Series system Element and Reservation ID The field specifies if this command is a Unit Release e Ifthe value is zero the command releases a reservation placed on this unit by the requesting initiator that meets 3rd party release requirements if applicable Element List Length Only valid if Element is 1 otherwise this field is reserved and must contain Os This field specifies Length of Element List Descriptors see table 63 that follow This value must be a whole multiple of the length of a single Element List Descriptor 6 Bit Byte 7 6 5 4 3 2 1 0 0 Reserved 0000h 1 2 MSB Number of Elements 3 LSB 4 MSB Starting Element Address 5 LSB Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient
216. nks see table 58 Quantum DX Series Software Interface Guide Table 57 Primary Volume Tag Information Table 58 Alternate Volume Tag Information Table 59 Storage Element Descriptor Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Volume Sequence Number This field is reserved and set to 0 Bit Byte 7 6 5 4 3 2 1 0 12 43 Volume Identification Field 44 Reserved 0000h 45 46 Volume Sequence Number 0000h 47 Bit Byte 7 6 5 4 3 2 1 0 0 4 Reserved 5 17 Drive Serial Number 18 Reserved The format of an element descriptor for an element of the storage element type is shown in table 59 Bit Byte 7 6 5 4 3 2 1 0 0 MSB Element Address 1 LSB 2 Reserved 0h Access Except ae Full Quantum DX Series Software Interface Guide 87 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Bit Byte 7 6 5 4 3 2 1 0 3 Reserved 00h 4 Additional Sense Code 5 Additional Sense Code Qualifier 6 7 Reserved 000000h 8 9 SValid ae Reserved 00h 10 Source Storage Element Address 11 12 47 Primary Volume Tag Information if present 48 51 Reserved 00000000h 52 Vendor Unique 0000h 53 Element Address Thi
217. ntly initializing the medium to prepare it for access Table 75 Status Codes Status Code Definition Meaning 00h GOOD The drive successfully completed the command 02h CHECK A Contingent Allegiance condition occurred CONDITION 08h BUSY The drive cannot service the command at the moment and its Command Descriptor Block has been discarded The initiator can retry the command at a later time 10h INTERMEDIATE This status is returned instead of aGOOD status for GOOD commands issued with the LINK bit set Following the return of this status the drive proceeds to the COMMAND phase for the transfer of the next linked command 114 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Status Code Definition Meaning 18h RESERVATION Another initiator has reserved the drive when it has CONFLICT been reserved for another initiator with a RESERVE UNIT command this status is never returned for INQUIRY or REQUEST SENSE commands 28h QUEUE FULL The drive cannot service the command at the moment and its Command Descriptor Block has been discarded Returned for a tagged command when all of the drive s internal command buffers are in use for instance DATA Phase Command Components Many of the SCSI commands cause data to be transferred between the initiator and the drive The content and characteristics of this data are command
218. ntum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Erase 19h Field Description Immed Immediate If the Immediate bit 0 the target does not return status until the selected operation has completed If set to 1 status is returned as soon as the operation has been initiated Tech Tip The immed bit is accepted but ignored in processing The erase will take place immediately Long Must be set to 1 The Long bit controls the distance of tape to be erased Filler and End of Data EOD blocks are written if needed then the entire rest of the tape is erased NOTE The ERASE command results in no operation for the tape drive unless the Long bit is set to 1 Issuing the ERASE command away from Beginning of Tape BOT is an ILLEGAL REQUEST RelAdr Relative Address Unused contents should be 0 Quantum DX Series Software Interface Guide 123 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Inquiry 12h Table 78 INQUIRY Command Descriptor Block Data Format 124 The INQUIRY command allows the initiator to determine the kind of SCSI devices attached to its SCSI Bus It causes a device that is attached to a SCSI Bus to return information about itself The drive identifies itself as a Direct Access Storage Device that implements the SCSI 2 protocol The drive does not need to access its tape medium to respond to the inquiry The drive can provide t
219. ntum com Quantum DX Series Software Interface Guide XXV Preface xxvi Quantum DX Series Software Interface Guide m Theory of Operation ee m Chapter 1 T This chapter discusses these topics e SCSI 2 Implementation Philosophy e Medium Changer Elements e Events e Operational Sequences Enhanced Data Protection Overview The Quantum DX Series system takes advantage of high speed hard drives to greatly reduce the time required for backup restore functions and also improve confidence in completing the backup in the time allowed Quantum DX Series Software Interface Guide 1 Chapter 1 Theory of Operation SCSI 2 Implementation Philosophy SCSI 2 Implementation Philosophy Using the SCSI 2 standard the DX Series system is designed so that the host can adapt to changes in the configuration For example the host can detect a change in the number of virtual tape drives configured in the DX Series system The DX Series system uses the SCSI 2 medium changer command set This command set is complete and includes all primitive elemental commands required by a host to carry out any required complex operation The DX Series system relies on the host computer to perform complex operations by issuing a sequence of elemental commands in the correct order The DX Series system does not execute operations that could result in damage to the device Medium Changer Elements The medium changer command set accesses address space
220. oaded another WRITE BUFFER with Download Microcode mode will be rejected The firmware image must be downloaded in integral multiples of 8K bytes Any error on a WRITE BUFFER command causes any downloaded image data to be discarded and the download must be restarted from the beginning Caution During the actual reprogramming of the FLASH EEPROM if any type of power fail occurs or if the reprogramming fails before completion the tape drive subsystem becomes unusable and the tape drive must be replaced Download This mode is used to download and save the entire image at once or to Microcode and download the image and save it or to cause a save operation after the Save Mode 101b image data has been downloaded using the Download Microcode mode without the Save This mode of the WRITE BUFFER command causes the image data to be verified and the Flash EEPROM firmware area to be updated Also when it is updating the EEPROM it disconnects from the SCSI bus and will not respond until the update is complete When the Save operation is successfully completed the firmware restarts itself causing the Power On Self Test POST to be run and two UNIT ATTENTION conditions are generated POWER UP RESET and OPERATING CODE HAS CHANGED 276 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Write Filemarks 10h Write Filemarks 10h Table 224 WRITE FILEMARKS Command Descriptor
221. ocation Length 8 LSB 9 Reserved 00h 26 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Log Sense 4Dh Logical Unit Number Logical Unit Number must be set to 0 Field indicates the logical unit to which the command is sent PPC Parameter Pointer Control field is not supported and must be set to 0 SP Save Parameters field is not supported and must be set to 0 PC Page Control field defines type of parameter values to be selected Only cumulative values are supported therefore this field must be set to 1 Page Codes Currently there are 3 supported page codes e 00h Supported Log Page see table 21 e 30h Medium Changer Statistic Page see table 22 e 3Fh Return all supported pages This is a composite of all pages returned sequentially Order is Supported Log Page followed by Medium Changer Statistic Page Parameter Pointer Field allows host to request parameter data beginning from a specific parameter code to the maximum allocation length or the maximum parameter code supported by the target whichever is less For parameter codes see table 24 Allocation Length Field specifies how much memory host has set aside to store log sense information returned by the DX Series system Supported Log Page Page returns the list of log pages supported see table 21 Quantum DX Series Software Interface Guide 27 Chapter 2 Emulated Medium Change
222. ompression algorithm If EEPROM parameter EnaRepDCcomp is set a value of 0 is reported if the last block read is not decompressed Device Configuration Page 10h The tape drive supports the Device Configuration Page The format for the page is illustrated in the following figure 218 Quantum DX Series Software Interface Guide Table 170 Device Configuration Page Data Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 Rsv d Page Code 10h 1 Additional Page Length OEh 2 Rsv d CAP 0 CAF 0 Active Format 0 3 Active Partition 0 4 WRITE Buffer Full Ratio 0 5 READ Buffer Empty Ratio 0 MSB 6 7 WRITE Delay Time LSB 8 BR 0 BIS 0 RSmk AVC SOCF 0 RBO 0 REW 0 0 9 Gap Size 0 10 EOD Defined 0 JEEG 1 SEW Reserved 1 MSB 11 13 Buffer Size at Early Warning 0 LSB 14 Select Data Compression Algorithm 15 Reserved Quantum DX Series Software Interface Guide 219 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah yet eve Field Name Description Configuration Page Feii Besenpiions PS Parameters Savable Not supported must be 0 Additional This field indicates the number of bytes in the page Page Length Note that this value does not include bytes 0 and 1 The length is returned on MODE
223. otion commands Quantum DX Series Software Interface Guide 119 Chapter 3 Emulated DLT7000 SCSI Commands SCSI Command Descriptions SCSI Command Descriptions 120 The SCSI commands are presented in alphabetical order Each command starts on a new odd numbered page Because information about a particular command may span multiple pages the command name is repeated in italics at the top of every page that concerns that command Blank pages in the chapter can be used for note taking The SCSI command descriptions that make up the rest of this chapter contain detailed information about each command supported by the Quantum DLT7000 system tape drive Fields common to many of the SCSI commands are supported as follows How Field is Supported in SCSI Name of Field Commands Logical Unit Number LUN for tape drive is 0 Reserved Reserved bits fields bytes and code values are set aside for future standardization and must be set to 0 If the drive receives a command that contains non zero bits in a reserved field or a reserved code value the command is terminated with a CHECK CONDITION status and the sense key is set to ILLEGAL REQUEST RelAdr Relative Address Unused contents should be 0 Explanations for those common fields are not repeated for every command in which they appear Throughout this manual multiple bytes that contain information about specific command parameters are portrayed as shown in t
224. pecific Information and Field Replaceable Unit Code These fields are not supported and are set to 0 78 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Request Volume Element Address B5h Table 53 Request Volume Element Address Command Tech Tip The DX Series system does not support Request Volume Element Address B5h The Request Volume Element Address command reports the element descriptors found by a Send Volume Tag command The type of element medium transfer storage import export or data transfer can be specified in the command as well as the starting address and number of elements for which status information is to be returned The format of the Request Volume Element Address command is shown in table 53 Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code B5h 1 Logical Unit Number VolTag Element Type Code 2 MSB Starting Element Address 3 LSB 4 MSB Number of Elements 5 LSB 6 Reserved 00h 7 MSB 8 Allocation Length 9 LSB 10 Reserved 00h 11 Reserved 00h Quantum DX Series Software Interface Guide 79 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h 80 Logical Unit Number The Logical Unit Number is 0 VolTag e The Volume Tag field VolTag indicates if the volume tag information associate
225. r Data Formatsnens hr inn na a e EEE 175 MODE SELECT 10 Mode Parameter Header Data Formatines neri nn ar aE E ANE 176 MODE SELECT Mode Parameter Header Field Descriptions oscense tnpa 177 MODE SELECT Mode Parameter Block Descriptor Datta Porat ssssscssssscecssevssedestecosse sects siniese neike esias 178 MODE SELECT Mode Parameter Block Descriptor Field Descriptions sisscccscse s cass al discesteces sates soins riiin ipa eass 178 MODE SELECT Page Descriptor Data Format 180 MODE SELECT Page Descriptor Field Descriptions 181 Error Recovery Page Data Format cccccccseeeeeeneeseeees 181 Error Recovery Page Field Descriptions 0 00 0 182 Disconnect Reconnect Page Data Format 183 Disconnect Reconnect Page Field Descriptions 184 Control Mode Page Format Descriptor Data Format 186 Control Mode Page Descriptor Field Descriptions 186 Quantum DX Series Software Interface Guide Table 143 Table 144 Table 145 Table 146 Table 147 Table 148 Table 149 Table 150 Table 151 Table 152 Table 153 Table 154 Table 155 Table 156 Table 157 Table 158 Table 159 Table 160 Table 161 Table 162 Table 163 Table 164 Table 165 Table 166 Table 167 Table 168 Table 169 Tables Data Compression Page Format Descriptor Data Format188 Data Compression Page Descriptor Field Descriptions 189 Device Configuration Page Data Format
226. r Log SENSE Page Page 2 and 3 described earlier in this manual The RLEC bit indicates whether the drive should return CHECK CONDITION status with sense key set to UNIT ATTENTION when one of the READ and WRITE error counters of the log pages reach a specified threshold Thresholds can be modified using LOG SELECT Queue Must be 0 Algorithm Modifier Qerr Queue Error Must be 0 DQue Disable Queuing Must be 0 EECA Enable Extended Contingent Allegiance Not supported must be 0 RAENP Ready Asynchronous Event Notification Not supported must be 0 UAAENP Unit Attention Asynchronous Event Notification Not supported must be 0 EAENP Enable AEN Permission Asynchronous event notification is not supported must be 0 Ready AEN Not supported must be 0 Hold off Period Quantum DX Series Software Interface Guide 187 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Data Compression Page OFh Table 143 Data Compression Page Format Descriptor Data Format 188 The Data Compression Page specifies parameters for the control of data compression This page allows the user to turn the tape drive s compressed format on and off independently of the tape medium s position Additionally it allows the user to enable or disable decompression of the tape drive compressed data during WRITE operations Bit Byte 7 6 5 4 3 2 0 0 Reserved
227. r SCSI Commands Log Sense 4Dh Table 21 Supported Bit Byte 7 6 5 4 3 2 1 0 Log Page 0 Reserved 0 Page Code 00h 1 Reserved 00h 2 MSB Page Length 0002h 3 LSB SUPPORTED PAGE LIST 4 00h 5 30h e Page Length Field specifies length in bytes of the supported page list e Supported Page List List of all log page codes supported Currently there are 2 pages supported e Supported Log Page 00h e Medium Changer Statistics Page 30h e Medium Changer Statistics Page Page returns medium changer statistical data see table 22 Table 22 Medium Bit Byte 7 6 5 4 3 2 1 0 Changer Statistics Page 0 Reserved 0 Page Code 30h 1 Reserved 00h 2 MSB Page Length 3 LSB LOG PARAMETER LIST 4 11 Log Parameter First 28 Quantum DX Series Software Interface Guide Table 23 Log Parameter Chapter 2 Emulated Medium Changer SCSI Commands Log Sense 4Dh Bit Byte 7 6 5 4 3 2 1 0 x 7 X Log Parameter Last Page Length Field specifies length in bytes of the log parameter list Log Parameter Each log parameter begins with a 4 byte parameter header followed by 4 bytes of parameter value data For the log parameter format see table 23 Bit Byte 7 6 5 4 3 2 1 0 0 MSB Parameter Code 1 L
228. re information Read Block Limits Implemented per specification See Read Block Limits 05h on page 232 for more information Read Buffer The DX Series system returns a check condition unsupported command whereas the DLT 7000 supports this command See Inquiry 12h on page 124 for more information Read Position Implemented per specification See Read Position 34h on page 238 for more information Quantum DX Series Software Interface Guide 309 Appendix E DX Series Software Deviations 310 Receive Diagnostics Implemented per specification See Receive Diagnostic Results 1Ch on page 241 for more information Release Unit Implemented per specification See Release Unit 17h on page 243 for more information Report LUNS Implemented per specification See Report LUNS AOh on page 245 for more information Request Sense All Sense Codes related to mechanical failures have been removed from the list since they will never occur See Request Sense 03h on page 247 for more information Reserve Unit When a reservation is made for itself the reservation is bound to its World Wide Node Name and not the ReservationID value passed in the Command See Reserve Unit 16h on page 254 for more information Rewind Implemented per specification Note The DX Series system will perform this operation in less than 5 seconds whereas a DLT 7000 may take much longer Quantum
229. read only 17h 42500 bpi MFM serial cartridge tape X3B5 91 2 6 GB DLTtape III only 18h Same as 17h but with 56 track pairs vs 24 6 0 GB DLTtape III only Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description 19h 62500 bpi 64 track pairs serial cartridge tape 10 0 GB DLTtape III only 15 0 GB DLTtape IIxt only 1Ah 81633 bpi 64 track pairs serial cartridge tape 20 0 GB DLTtape IV only 1Bh 85937 bpi 52 quad pairs serial cartridge tape 35 0 GB The density codes above are the preferred codes used to define density Additionally the following codes may be used though use of the Data Compression Page is preferred 7Fh No change from previous density No Operation 80h 62500 bpi 64 track pairs serial cartridge tape 10 0 GB DLTtape III 15 0 GB DLT tape IIIxt without compression 81h 62500 bpi 64 track pairs serial cartridge tape 20 0 GB DLTtape III 30 0 GB DLTtape IIIxt with compression 82h 81633 bpi 64 track pairs serial cartridge tape 20 0 GB DLTtape IV without compression 83h 81633 bpi 64 track pairs serial cartridge tape 40 GB DLTtape IV with compression 84h 85937 bpi 52 quad tracks serial cartridge tape 35 GB without compression 85h 85937 bpi 52 quad tracks serial cartridge tape 70 GB with compression Quantum DX Series
230. result of the RECEIVE DIAGNOSTIC command Note that a REQUEST SENSE command should be used to obtain more detailed information following a CHECK CONDITION on a SEND DIAGNOSTIC command Quantum DX Series Software Interface Guide 241 Chapter 3 Emulated DLT7000 SCSI Commands Receive Diagnostic Results 1Ch Table 194 RECEIVE DIAGNOSTIC RESULTS Data Format 242 Bit Byte 7 6 5 4 3 2 1 0 0 Controller Present Flag 1 Controller Error Flag 2 Drive Present Flag 3 Drive Error Flag 4 Media Loader Present Flag 5 Media Loader Error Flag Note Flag set 1 failure Flag not set 0 not present or no error This information indicates which of the main components of the tape drive subsystem may have failed diagnostic testing Quantum DX Series Software Interface Guide Release Unit 17h Table 195 RELEASE UNIT Command Descriptor Block Data Format Table 196 RELEASE UNIT Command Data Field Descriptions Chapter 3 Emulated DLT7000 SCSI Commands Release Unit 17h The RELEASE UNIT command releases the drive if it is currently reserved by the requesting initiator It is not an error to release the tape drive if it is not currently reserved by the requesting initiator If the tape drive is reserved by another initiator however it is not released the tape drive is only released from the initiator that issued the RELEASE command Bit Byte 7 6 5 4 3 2
231. rface Guide Chapter 3 Emulated DLT7000 SCSI Commands Reserve Unit 16h Field Name Description Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient manner that a command has been completed Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system A reservation via the RESERVE UNIT command remains in effect until one of the following conditions is met The initiator that made the reservation sends another RESERVE UNIT command The tape drive is released via a RELEASE UNIT command from the same initiator A BUS DEVICE RESET message is received from any initiator A hard reset occurs The occurrence of the last two conditions is indicated by the drive returning a CHECK CONDITION status sense key of UNIT ATTENTION on the next command following the condition It is not an error to issue a R
232. rk and Valid bits are set and the Sense Key field is set to NO SENSE The information fields contain the residue count The Additional Sense Code and Additional Sense Code Qualifier fields are set to FFLEMARK DETECTED Upon termination the medium is logically positioned after the Filemark If the drive detects End of Data EOD during a READ the drive returns a CHECK CONDITION status Within the sense data the Valid bit is set and the Sense Key field is set to BLANK CHECK The End of Medium EOM bit may be set if the drive determines that the tape is positioned past the PSEN marker The information fields contain the residue count The Additional Sense Code Qualifier fields are set Upon termination the medium is physically positioned before EOD and after the last block on tape The meaning of EOD is different for a READ command than for a WRITE related command EOM is reported only when the physical EOM or End of Partition EOP is encountered The drive returns a CHECK CONDITION status The EOM and Valid bits are set and the Sense Key is set to MEDIUM ERROR The information fields contain the residue count and the Additional Sense Code and Additional Sense Code Qualifier fields are set to EOM P DETECTED The tape is physically positioned at EOM P If any READ command cannot be successfully completed the drive returns a CHECK CONDITION status Further commands should attempt to move past the anomaly and to complete successfully Quantum
233. rns CHECK CONDITION status with sense key set to UNIT ATTENTION 06h when one of its WRITE and READ error counters reaches a specified threshold as follows 0 Do not return UNIT ATTENTION when a threshold has been met 1 Return UNIT ATTENTION when a threshold is met Queue Must be 0 Algorithm Modifier Qerr Queue Error Must be 0 Dque Disable Queuing Must be 0 EECA Enable Extended Contingent Allegiance Not supported must be 0 Ready AEN Not supported must be 0 Hold off Period RAENP Ready AEN Permission Asynchronous event notification is not supported must be 0 UAAENP Unit Attention AEN Permission Not supported must be 0 EAENP Enable AEN Permission Asynchronous event notification is not supported must be 0 216 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Data Compression Page 0Fh The Data Compression page specifies parameters for the control of data compression Table 168 Data Bit Byte 7 6 5 4 3 2 1 0 Compression Page Data Format 0 PS 0 Rsv d Page Code 0Fh 1 Page Length 0E 2 DCE DCC Reserved 3 DDE RED 0 Reserved 0 MSB 4 7 Compression Algorithm LSB MSB 8 11 Decompression Algorithm LSB 12 15 Reserved Table 169 Data Field Name Description Compression Page pence ele Page Length The value in this field indicates the number of
234. rom Tape 06h Mbytes Transferred from Host 07h Bytes Transferred from Host 08h Mbytes Written to Tape 09h Bytes Written to Tape DU Disable Update Always 0 DS Disable Save Not supported This bit always set to 1 TSD Target Save Disable Not supported This bit always set to 1 ETC Enable Threshold Comparison Threshold checking is not supported on this page Always set to 0 TMC Threshold Met Criteria Always 0 170 Quantum DX Series Software Interface Guide Field Name LP Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Description List Parameter Always set to 0 parameter codes treated as data counter Counter Value Parameter Codes 06h and 07h Report the count of bytes transferred from the initiator to the buffer Parameter Code 06h reports the number of full megabytes transferred Parameter Code 07h reports the number of bytes less than a full megabyte that have been transferred Multiplying the counter returned for Parameter Code 06h by 1 048 576 and then adding the value of the counter returned by Parameter Code 07h results in the actual total bytes transferred from the initiator to the buffer Parameter Codes 08h and 09h Report the count of bytes written to the tape drive Parameter Code 08h reports the number of full megabytes transferred Parameter Code 09h reports the number of bytes less than a full megabyte that have been transferred Multiplying th
235. rred Information about the event is stored in the TapeAlert Log Page The setting of MRIE does not impact logging of events in the TapeAlert Log Page Quantum DX Series Software Interface Guide 199 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h EEPROM Vendor Unique Page 3Eh Changeable Parameters within MODE SELECT Table 151 Changeabl e Parameters within MODE SELECT Parameter Field Name Description Interval Not supported Timer Report Not supported Count Test Flag Number Tech Tip All parameter values and flags are accepted but not acted on EEPROM Vendor Unique Page 3Eh is not supported The table below lists the MODE SELECT command s changeable parameters and their default minimum and maximum values Descriptions of the various parameters are provided in the discussions of the different mode pages within MODE SELECT Note that parameter rounding is supported for all parameters except for the block descriptor length Default Header Buffered Mode Device 1 Specific Byte Minimum 0 Maximum 1 Block Descriptor Length 08h 00h 08h 200 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Parameter Default Minimum Maximum Block Descriptor Block Length 2 0 GB and 6 0 GB Mode 0 0 40000h 10 0 GB and
236. rt export element Tech Tip The DX Series system does not support import export elements Quantum DX Series Software Interface Guide 55 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h e Aindicates data transfer elements e Starting Element Address and Number of Elements These fields are used to select the range of elements to report Within this range no status information is reported for an undefined element address e Only elements matching the indicated type are returned e No elements with an address smaller than the Starting Element Address are reported Beginning with the first defined element with an address greater than or equal to the Starting Element Address all defined type matching elements are reported until reports for the indicated number of elements have been returned e Allocation Length This field specifies how much memory the host has set aside to store the status information returned by the DX Series system e This field should be set to a number that is large enough to store the status information for the requested number of elements e If the field is not large enough the DX Series system only reports the status information for the number of elements whose status information fits within the allocated space The returned Read Element Status Data has the general structure as depicted in figure 1 56 Quantum DX Series Software Interface Guide Fi
237. rvation any other initiator attempts to perform any command except Inquiry Request Sense or Release the command is rejected with a Reservation Conflict status A Release command issued by another initiator is ignored by that reserved logical Quantum DX Series Software Interface Guide 95 Chapter 2 Emulated Medium Changer SCSI Commands Reserve 16h Table 62 Reserve Command 96 unit If after honoring an Element Reservation any other initiator issues a command other than Release to that element the command is rejected with a Reservation Conflict status A Release command issued by another initiator is ignored by the reserved element Logical Unit Number Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 16h 1 Logical Unit Number 3rdPty 3rd Party ID Element 2 Reservation ID 3 MSB Element List Length 4 LSB 5 Unused Reserved 00h Flag 0 Link 0 The Logical Unit Number must always be 0 This field indicates the logical unit to which the command is sent e 3rdPty and 3rd Party ID Tech Tip The DX Series system does not support 3rd part reservation or 3rd party ID The 3rd party reservation option for Reserve Unit allows an initiator to reserve a logical unit for another SCSI device This option is for systems that use Copy and is implemented by the DX Series system e If the 3rd party 3rdPty bit is 0 the option is not requested If the 3rdPty bit is 1 Reserve U
238. s command if known to Technical Support F1 01 COMMAND HEAP OVERFLOW Internal firmware error Report this occurrence and previous command if known to Technical Support Quantum DX Series Software Interface Guide 287 Appendix B Media Changer Sense Code Values 288 ASC ASCQ F1 02 Message Name Description UNRECOGNIZED COMMAND Internal firmware error Report this occurrence and previous command if known to Technical Support F1 03 COMMAND REGISTER ERROR Internal firmware error Report this occurrence and previous command if known to Technical Support Quantum DX Series Software Interface Guide Appendix C DLT7000 Sense Code Values Table 228 lists message information that can be sent from the DLT7000 tape drive to the host computer Table 228 is sorted by the data in the ASC column second column from left and lists the following information e Additional Sense Code ASC e Additional Sense Code Qualifier ASCQ e Message name description and potential recovery action Message name and description may contain abbreviations as follows e LU Logical Unit e REQ D Required e DEV Device e DIAG Diagnostics e NVRAM Nonvolatile RAM e A D Analog to Digital Quantum DX Series Software Interface Guide 289 Appendix C DLT7000 Sense Code Values Tle 228 BLED isc Description Data Values Hexadecimal 0
239. s field indicates the address of the element being reported by that element descriptor e Access An access bit value of 1 indicates that access to the element by a medium transport element is allowed Except e When the element is in a normal state it is set to zero e When the element is in an abnormal state it is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields in that element descriptor For the meaning of the codes contained in the 2 Sense Code fields see Request Sense 03h on page 75 88 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h e Full e The Full field is set to 1 whenever the element contains a tape cartridge e It is set to 0 otherwise e Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to 1 Currently the only valid values for these fields indicate e Element Contents Unknown condition ASC 80 ASCQ 22 e Cleaning Cartridge Installed ASC 30 ASCQ 03 e Operation Medium Removal Requested ASC 5A ASCQ 01 e SValid e The SValid bit is set to 1 if information in the Source Storage Element Address field is valid e If information is unknown due to a door open or power on condition the SValid bit is set to 0 Invert The Invert field is not supported and is set to 0 Source
240. s indicate potential hazards to equipment and are included to prevent damage to equipment Cautions may advise you that failure to take or avoid an action could result in corrupt data or loss of data Note Notes emphasize important information related to the main topic Warning Warnings indicate potential hazards to personal safety and are included to prevent injury Tech Tip Tech tips indicate an area that deviates from normal DLT tape drive or changer behavior This manual uses the following All binary numbers are succeeded by b e All hexadecimal numbers are succeeded by h e Error or attention conditions are represented in parenthesis that translate as follows SK S ASC AA ASCOQ QQ where S hexadecimal sense key value AA hexadecimal additional sense code QO hexadecimal additional sense code qualifier Quantum DX Series Software Interface Guide xxiii Preface Related Documents Contacts xxiv Manuals associated with DX Series system Document Number Title Description 6513501 DX30 DX100 User s Contains sections on Guide installation operation and diagnostic software 6513503 DX30 DX100 Field Provides removal and Service Manual replacement instructions for all field replaceable units 81 81493 DX3000 DX5000 Contains sections on User s Guide installation operation and diagnostic software SCSI 2 Sp
241. s system supports reporting of current errors only A current error error code 70h is returned when the error was generated during the execution of a command indicating the check condition The DX Series system supports unit attention condition queuing as described in the SCSI 2 specification Other details of processing for this command are consistent with the SCSI 2 specification The format of the Request Sense command is shown in table 51 e Logical Unit Number The Logical Unit Number is 0 This field indicates the logical unit to which the command is sent Bit Byte 7 6 5 4 3 2 0 Operation Code 03h 1 Logical Unit Number Reserved 00h 2 Reserved 0000h 3 4 Allocation Length 5 Reserved 00h e Allocation Length This field contains the maximum amount of data that may be returned to the host Anything greater than 24 returns the full 24 bytes of data The format of the Request Sense data is shown in table 52 Quantum DX Series Software Interface Guide 75 Chapter 2 Emulated Medium Changer SCSI Commands Request Sense 03h Table 52 Request Bit Byte 7 6 5 4 3 2 1 0 Sense Data 0 Valid 0 Error Code 70h 1 Segment Number 00h Filemark Rsrvd 2 0 EOM 0 ILI 0 0 Sense Key 3 MSB 4 Information Bytes 00000000h 5 6 LSB 7 Additional Sense Len
242. se 6 10 1Ah 5Ah Field Name Description Number of This field is sent as 0 indicating that all of the Blocks remaining logical blocks on the tape have the medium characteristics specified by the block descriptor Block This field specifies the length in bytes of each Length logical block transferred over the SCSI bus A block length of 0 indicates that the length is variable as specified in the I O command Any other value indicates the number of bytes per block that are used for READ WRITE and VERIFY type commands that specify a fixed bit of 1 fixed block mode The following figure depicts the variable length page descriptor Bit Byte 7 6 5 4 3 2 1 0 0 PS 0 Page Code 1 Additional Page Length 2 Page Defined or Vendor Unique Parameter Bytes Descriptions of the MODE SENSE page descriptor fields are provided in the following table Detailed descriptions of each of the MODE SENSE Pages follow Quantum DX Series Software Interface Guide 209 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Table 161 MODE Description Parameters Savable When 0 the supported parameters cannot be saved savable pages are not supported When set to 1 it indicates that the page can be saved in nonvolatile memory by the drive SENSE Page Field Name Descriptor Field Descriptions PS Additional Page Length This field indicates the number of bytes
243. se Error status is not returned if the value in this field truncates the requested information Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient manner that a command has been completed Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system Quantum DX Series Software Interface Guide 125 Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Table 80 Vital Product Data Page Codes Standard Inquiry Data Page Table 81 Inquiry Command 12h 126 Page Code Description 00h Supported Vital Product Pages Page 80h Unit Serial Number Page 83h Device Identification Page COh Code Build Information Clh Subsystem Components Revision Page Table 81 shows the format of the Standard Inquiry Data page returned by
244. se data to the initiator Table 199 REQUEST Bit Byte 7 6 5 4 3 2 1 0 SENSE Command Descriptor Block 0 Operation Code 03h Data Format 1 Logical Unit Number Reserved 2 3 Reserved 4 Allocation Length 5 Unused Reserved Flag 0 Link 0 Table 200 REQUEST A er E r RER Field Name Description Data Field Descriptions Allocation This field specifies the maximum number of sense Length bytes to be returned The tape drive terminates the transfer when this number of bytes has been transferred or when all available sense data has been transferred to the host whichever is less The REQUEST SENSE command causes the tape drive to transfer detailed sense data to the initiator The sense data is valid for a CHECK CONDITION or RESERVATION CONFLICT status returned on the previous command The sense data bytes are preserved by the tape drive until retrieved by a REQUEST SENSE command or until the receipt of any other command from the same initiator though some commands such as INQUIRY do not change sense data If the tape drive receives an unsolicited REQUEST SENSE it returns sense data with the appropriate values in the End of Media EOM Sense Key Additional Sense Code and Additional Sense Code Qualifier The positional information provided reflects the logical position of the tape Quantum DX Series Software Interface Guide 247 Chapter 3 Emulated DLT7000 SCSI Commands
245. served MRIE MSB 4 7 Interval Timer LSB MSB 8 11 Report Count Test Flag Number LSB Field Name Description PS Parameters Savable For MODE SELECT this bit must be 0 Additional This field indicates the number bytes in the page Page Length However the value does not include bytes 0 and 1 The length is returned in MODE SENSE commands and must subsequently be set to the same value when performing MODE SELECT If the page length does not match that expected by the drive a CHECK CONDITION status is returned sense key set to ILLEGAL REQUEST The drive returns a CHECK CONDITION status with sense key set to ILLEGAL REQUEST if it receives an unsupported Page Code or a Page field with values not supported or changeable In such cases no parameters are changed as a result of the command Perf Performance bit Not supported always 0 Quantum DX Series Software Interface Guide 197 Chapter 3 Emulated DLT7000 SCSI Commands Mode Select 6 10 15h 55h Field Name Description DExcpt Disable Information Exception Operations When this bit 0 the reporting method specified by the contents of MRIE is selected When this bit 1 its default setting all information exception operations are disabled and the contents of the MRIE field are ignored When in this mode the TapeAlert Log page is polled by the software To enable CHECK CONDITION mode DExcpt should 0 Test Test Bit Not supported
246. sesenseenesaens 54 Release LZ ercan aine E E EENE 71 Report LUNS AQh uceci edra ae i E EE E 73 Reguest Sense 03H ni eE E EAE EET 75 Request Volume Element Address Boh ce eseeesecesescsseeseseeseeeseeaesesees 79 Resetve 1ON scsssscssescsicsseeckeritussccxerscuacesnens n a a 95 Rezero Umit Olhei e ET EEREN 99 Send Diagnostic LDN siscccsessovcsesavessversesassescvevsdesssesesoesbesassostonctessevasssecvestecs 100 Send Volume Tag BON ssecsissisecnssessssssessssaissessvenssssebevoensesesotosoonsonsvonsonentoneasea 102 Test Unit Ready OO s ciscscsseasseescsosnssvcsevossvebencvasasobsncsaunsosevesauesescveseervenenee 105 Emulated DLT7000 SCSI Commands 107 Overview of Command and Status Processing s ssesssesissesrrereesereesrese 108 SCSI Pontet Seini e EE ERS 109 Kesel e EN Ee EEOAE 110 Status Error Reporting snrnid aiiis 113 DATA Phase Command Componentt cccccceesecsssetsssesesenseeeeterees 115 Unit Attention Condition eccceescseescseescsescsseecseecaeeecaeeecaseecasereaters 118 Behavior at Power On and SCSI Bus Reset cceeseeeeeeseneeeeeeeenes 118 Data Cache and Tape Write Interaction eseseeeeeereeeteeeeeesenes 119 SCSI Command Descriptions secesii e 120 Erase TOD rras een e n E ETOO ENEN EE 122 Pnguiry 2h snsess inire Eea E EA A ERA 124 Standard Inquiry Data Page ssssssssesesssesiesresrssrestesresresresseereenrssrsneese 126 Vendor Unique Inquiry Data 00 eee cece ceeseeeetesneeeseeeeneees 129
247. status Additional Sense Codes are discussed in detail later in this chapter Additional This field and the field for Additional Sense Code Sense Code provides additional information about the Sense Qualifier Key and cause of a CHECK CONDITION status Additional Sense Code Qualifiers are discussed in detail later in this chapter Sub Not used Returned as 0 Assembly Code SKSV Sense Key Specific Valid When 1 indicates that the Sense Key specific field is as defined by the International Standard C D Command Data When set to 1 this field indicates that the illegal parameter is contained in the Command Descriptor Block A C D set to 0 indicates that the illegal parameter is in the Parameter List from the initiator BPV Bit Pointer Valid When set to 1 this field indicates that the Bit Pointer field is valid and designates which bit of the byte designated by the field pointer is in error For a multi bit field it points to the most significant bit of the field Field Pointer This field indicates which byte of the Command Descriptor Block or Parameter List is in error For a multi byte field the most significant byte is indicated Internal Internal Status Codes Vendor Unique are Status Code VU explained in detail in Appendix A Quantum DX Series Software Interface Guide 251 Chapter 3 Emulated DLT7000 SCSI Commands Request Sense 03h Field Name Description Tape Motion This field reports t
248. stem CMDQue Command queuing value of 0 indicates the device does not support tagged command queuing for this DX Series system SftRes e A soft reset bit of 0 indicates the device responds to the RESET condition with a hard reset e A softreset bit of 1 indicates the device responds to the RESET condition with a soft reset Vendor ID The vendor ID string is selectable The default inquiry string is P1000 and the alternate inquiry string is DX30 or DX100 For the P1000 inquiry this field contains the string ATLbbbbb For the DX30 inquiry this field contains the string QUANTUMb For the DX100 inquiry this field contains the string QUANTUMb For the DX3000 inquiry this field contains the string QUANTUMb For the DX5000 inquiry this field contains the string QUANTUMb Quantum DX Series Software Interface Guide 19 Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Supported Vital Product Data Page Table 11 Supported Vital Product Data Page 20 Product ID The product ID is selectable The default product ID is P1000 and the alternate product ID are DX30 and DX100 For the P1000 inquiry P1000bbbb6220050 For the DX30 inquiry DX30bbbbb6220050 For the DX100 inquiry DX100bbbb6220050 For the DX3000 inquiry DX3000bbb6532501 For the DX5000 inquiry DX5000bbb6532502 Note Inthe ASCII strings above each b represents a space 20h and 6220050 represents the DX30 and DX100 system part num
249. system Use of these bits is initiator dependent Setting the Link bit 1 provides an automatic link to the next command bypassing the usual ARBITRATION SELECTION and MESSAGE OUT phases that would normally occur between commands Other bits in the Control Field are considered to be reserved RelAdr Relative Address must be 0 not supported Table 73 Command Descriptor Block Control Field Data Format 112 Bit Byte 7 6 5 4 3 2 1 0 5 endor Specific Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide Table 74 Command Descriptor Block Control Field Field Descriptions Field Vendor Specific Bits Chapter 3 Emulated DLT7000 SCSI Commands Overview of Command and Status Processing Description These bits must be 0 Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient manner that a command has been completed Tech Tip Flag bits are not supported by the DX Series system Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive comp
250. t Note Because of data generation and verification this test only streams the tape for short periods of time If Block Count is set very high the test can take many minutes or even many hours to complete If the specified diagnostic test passes a GOOD status is returned Otherwise a CHECK CONDITION is generated and the Sense Data contains information about the failure Quantum DX Series Software Interface Guide 263 Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1Dh Description Medium Error A positioning error has occurred in which the returned position does not match the expected position Additional Sense Code for possible additional information Hardware Error The Additional Sense Code and any Additional Sense Code Qualifier provide more specific information ILLEGAL REQUEST Illegal bit settings in the SEND DIAGOSTIC command Table 213 Sense Sense Key Keys Used for SEND DIAGNOSTIC 3h 4h 5h Eh Miscompare A compare error occurred during a READ operation Additional Sense Codes and Additional Sense Code Qualifiers that apply to SEND DIAGNOSTIC self test results are described in the table below Table 214 ASC ASC ASCQ Description ASCQ for SEND DIRGNGSIIG 15h 2h A positioning error has occurred in which the returned position does not match the expected position 40h 80h Level 1 ROM Test Failed 40h 81h Level 1 RAM Test Failed 40h 82h Level 1
251. t Number 7 SCSI Bus Address 8 Reserved 00h 9 SValid sa Reserved 00h 10 Source Storage Element Address 11 12 47 Primary Volume Tag Information Field omitted if PVolTag 0 48 83 Alternate Volume Tag Information Field omitted if AVolTag 0 84 87 Reserved 00000000h 88 Vendor Unique 0000h 89 Element Address This field indicates the address of the element being reported by that element descriptor Quantum DX Series Software Interface Guide 67 Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h 68 Access An access bit value of 1 indicates access to the element by a medium transport element is allowed Except e When the element is in a normal state field is set to 0 e When the element is in an abnormal state field is set to 1 e Information on the abnormal state is available in the Additional Sense Code and Additional Sense Code Qualifier fields in that element descriptor Sense Key Values on page 295 for the meaning of the codes contained in the two Sense Code fields Full e The Full field is set to 1 whenever the element contains a tape cartridge e It is set to 0 otherwise Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to 1 Currently the only valid values for these fields indicate e Element Contents Unknown condition ASC 80 ASCQ 22 e Tape Drive Requires Cleaning ASC 80 ASCQ 01 e
252. t of Report Available 7 LSB 8 X One or More Element Status Page s First Element Address Reported Indicates element address of element with smallest element address found to meet the command description block request Number of Elements Reported e Indicates number of elements meeting the request in the command descriptor block e Element status is returned if sufficient allocation length was specified Byte Count of Report Available Indicates number of bytes of element status page data available for all elements meeting the request in the command descriptor block From 1 to 4 Element Status Pages can be returned One page is returned for each element type with status information Each page contains a header and 1 or more element descriptors Each element descriptor reports the status for a single DX Series system element Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h The page header bytes 0 7 defines the contents of the element descriptors for the elements of that type The format of a status page is shown in table 41 Table 41 Element Bit Byte 7 6 5 0 Status Page Element Type Code PVol AVol Tag Tag Reserved 00h MSB Element Descriptor Length LSB Reserved 00h MSB Byte Count of Descriptor Data Available LSB One or More Element Descriptors e PVolTag e A Primary Volume Tag field valu
253. ta Format Read Error Counter Page Page 03h Last n Error Events Page 07h TapeAlert Page 2Eh 162 When page 00h is requested the 4 byte page header is returned followed by the pages supported in ascending order one byte for each Bit Byte 7 6 5 4 3 2 1 0 0 Reserved Page Code 00h 1 Reserved MSB 2 3 Page Length 08h LSB 4 00h 5 2Eh 6 32h The Read Error Counter Page 03h is not supported The Last n Error Events page 07h is not supported This page returns results of the tape drive s on going self diagnosis so that the tape drive s behavior can be monitored and high reliability ensured The TapeAlert page is read from the tape drive at the beginning of each READ WRITE activity after any fatal errors occur during a READ WRITE at the end of any tape cartridge when the READ WRITE activity continues onto another tape cartridge and at the end of each Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh READ WRITE activity The flags of which there are 16 are set or cleared by the tape drive when the failure or corrective action occurs Tech Tip The tape alert page returns cleared error information in the DX Series system Table 113 TapeAlert Bit Byte 7 6 5 4 3 2 1 0 LOG SENSE Header Format 0 Page Code 2Eh 1 Reserved 2 3 Parameter
254. te 2Bh The LOCATE command is used to do high speed positioning to the specified block address The READ POSITION command can be used to obtain the block address when writing when particular blocks of data a data file for example are about to be written The LOCATE command can then be used to position the tape back at the same logical position for high performance restore operations of particular blocks of data Table 101 LOCATE Bit Byte 7 6 5 4 3 2 1 0 Command Descriptor Block Data Format 0 Operation Code 2Bh 1 Logical Unit Number Reserved BT 0 CP 0 Immed 2 Reserved MSB 3 6 Block Address LSB 7 Reserved 8 Partition 9 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide 147 Chapter 3 Emulated DLT7000 SCSI Commands Locate 2Bh Table 102 LOCATE Description Block Type The Block Type bit indicates how the Block Address field is interpreted The first recorded object block or filemark is at address 0 and Block Addresses count both data blocks and filemarks Change Partition Since multiple partitions are not supported this bit must be set to 0 Immediate If this bit is set to 1 status is returned as soon as the operation is started If set to 0 status is returned after the operation has completed Tech Tip The immed bit is accepted but ignored in processing The Block Address field def
255. ted page are not sent in ascending order The LP bit see table 108 is set to 1 in the parameter control byte The DS bit see table 108 is set to 0 in the parameter control byte The TSD bit see table 108 is set to 0 in the parameter control byte Quantum DX Series Software Interface Guide 157 Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Log Sense 4Dh Table 109 LOG SENSE Command Descriptor Block Data Format 158 The LOG SENSE command allows the host to retrieve statistical information maintained by the tape drive about its own hardware parameters or about the installed tape medium It is a complementary command to LOG SELECT Series system Tech Tip Log pages 2 and 3 are cleared when the unload command is received by a virtual drive in the DX Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 4Dh 1 Logical Unit Number Reserved PPC SP 0 0 2 PC Page Code 3 4 Reserved MSB 5 6 Parameter Pointer LSB MSB 7 8 Allocation Length LSB 9 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide Table 110 LOG SENSE Command Descriptor Block Field Descriptions Field Name PPC Chapter 3 Emulated DLT7000 SCSI Commands Log Sense 4Dh Description Parameter Pointer Control This bit must be set to 0 A PPC of 0 indicates that the parameter data requested from the device starts with t
256. tely for each valid LUN for each initiator Unit Attentions are created in each of the following circumstances e At Power On e At Bus Reset e At Bus Device Reset message e When the medium may have changed asynchronously e When another initiator changes the Mode Parameters e When a firmware microcode update has completed Two queued Unit Attentions are not unusual For example if a unit is powered up and a tape cartridge is loaded Power Up and Not Ready to Ready Transition Unit Attentions are created Due to the limited number of Unit Attention buffers if an initiator does not clear Unit Attentions queued for it at some point the tape drive stops generating new Unit Attentions for that initiator logical unit combination existing ones will be left queued however A LOAD command does not generate a Unit Attention for the initiator that issued the command since the transition to Ready is synchronous The following apply to the DLT7000 system tape drive s behavior at power on and or SCSI bus reset e When the Quantum DLT7000 system is powered up all device SCSI lines are set to high impedance The design of the DLT7000 system tape drive does not allow it to generate any spurious signals on the SCSI bus at power on e Within five seconds of power on and within 250 milliseconds typically under 4 milliseconds after a SCSI bus reset the DLT7000 system tape drive responds to SCSI bus selections and returns appropriate norma
257. tem returns a check condition unsupported command whereas the ATL P1000 supports this command Release The DX Series system only performs Unit Reservation Releases Element reservation releases are validated but are never performed nor tracked See Release 17h on page 71 for more information Quantum DX Series Software Interface Guide Appendix E DX Series Software Deviations Report LUNS Implemented per specification See Report LUNS AOh on page 73 for more information Request Sense The DX Series system sense data size is 24 bytes whereas the ATL P1000 is 21 bytes The extra 3 bytes are located at the end and are reserved All Sense Codes related to mechanical failures have been removed from the list since they will never occur See Request Sense 03h on page 75 for more information Request Volume Element Address The DX Series system returns a check condition unsupported command whereas the ATL P1000 supports this command See Request Volume Element Address B5h on page 79 for more information Reserve The DX Series system only performs Unit Reservations Element reservations are validated but are never made nor tracked When a reservation is made for itself the reservation is bound to its World Wide Node Name and not the ReservationID value passed in the Command See Reserve 16h on page 95 for more information Rezero Unit Implemented per specification See Rezero Unit 01h on page 9
258. ter of Data Transport Elements 17 LSB 18 Reserved 0000h 19 PS Parameters Savable This bit is always set to 1 indicating this page can be saved to nonvolatile memory e First Medium Transport Element Address Field identifies the first medium transport element contained in the medium changer other than the default medium transport address of 0 Number of Medium Transport Elements Field defines total number of medium transport elements contained in the medium changer 44 Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah First Storage Element Address Field identifies the first storage element contained in the medium changer Number of Storage Elements Field defines total number of storage elements contained in the medium changer First Import Export Element Address Field identifies the first import export element contained in the medium changer Tech Tip The DX Series system does not support First Import Export Element Address Number of Import Export Elements Field defines total number of import export elements in the medium changer Tech Tip The DX Series system does not support Number of Import Export Elements First Data Transport Element Address The First Data Transfer Element Address field identifies the first data transfer element contained in the medium changer Number of Data
259. ter pages defined in the SCSI 2 specification and two vendor unique pages Element Address Assignment Page Transport Geometry Parameters Page e Device Capabilities Page Vendor Unique Page 20h e Vendor Unique Page 00h The host can request all pages with a single command using the Return All Pages page code as described in the SCSI 2 specification The format for the Mode Sense command block is shown in table 30 Quantum DX Series Software Interface Guide 39 Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah zane 20 Mode Bit Byte 7 6 5 4 3 2 1 0 Sense Command 0 Operation Code 1Ah Rsrvd 1 Logical Unit Number 0 DBD Reserved 00 2 PC Page Code 3 Reserved 00h 4 Allocation Length 5 Reserved 00h e Logical Unit Number The Logical Unit Number field must be set to 0 This field indicates the logical unit to which the command is sent DBD e When the Disable Block Descriptors field is set to 0 the target may return 0 or more block descriptors in the returned Mode Sense data at the target s discretion e A DBD bit of 1 specifies the target does not return any block descriptors in the returned Mode Sense data e PC The Page Control field defines parameter type values to return e 0 requests current parameter values for the specified page code for the DX Series system current values returned are the default values e 1
260. testing is not necessary therefore it is an extension of the power up self tests that are run The code ROM EDC is verified two queues used by much of the controller software are checked by dequeuing and enqueuing items If a loader Medium Changer is configured the test attempts a software reset on the loader This test does not attempt a WRITE or READ to or from the tape medium When complete any errors that occur are reported in the extended Sense Data bytes This Level 1 test has an execution time of approximately five 5 seconds e Specify the Electronics Self Test by setting the Selftst bit to 1 and both the DevOfl and UnitOfl bits to 0 e Read Write Functionality Test Level 2 Test e The default version of this test does the following e Writes 500 32 KB records on track 0 forward motion e Rewinds the tape e Reads the records e Positions to the beginning of track 1 backward motion e Writes 500 32 KB records on track 1 e Repositions to the beginning of track 1 e Reads the records e Rewinds the tape The execution time for this Level 2 test is approximately 6 minutes if calibration is not required Specify the Read Write test by setting both the Selftst bit and the UnitOfl bit to 1 and ensuring that the DevOfl bit to 0 A level III or test type III is available with user defined parameters Quantum DX Series Software Interface Guide 259 Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1D
261. th LSB Field Name Description Page Code The Page Code specifies for which Log Page this LOG SELECT command is directed The Page Length field specifies the total number of bytes contained in this log page not including the four bytes that make up the header Page Length Quantum DX Series Software Interface Guide 153 Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Table 107 LOG SELECT Log Parameters Format Table 108 LOG SELECT Log Parameters Field Descriptions 154 Bit Byte 7 5 4 3 2 1 0 MSB 0 1 Parameter Code LSB 2 DU DS TSD ETC TMC Rsv d LP 3 Parameter Length MSB 4 7 Parameter Code LSB Note Byte 2 is also referred to the Parameter Control Byte Field Name Parameter Code Description Parameter Codes supported for the READ WRITE error counter pages are as follows Parameter Code Descriptions 00h Errors corrected with substantial delays 01h Errors corrected with possible delays 02h 0 03h 0 04h Total times correction algorithm processed 05h Total bytes processed 06h 0 8000h Vendor Unique Note Parameter codes 00h 01h and 04h always have a value of 0 Parameter value for 05h is 8 bytes the parameter length is set to 8 Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Log Select 4Ch Field Name Description
262. the element contains no tape or the load port door is open e Additional Sense Code and Additional Sense Code Qualifier These fields are only valid if the Exception field is set to 1 Currently the only valid values for these fields indicate e Element Contents Unknown condition ASC 80 ASCQ 22 e Cleaning Cartridge Installed ASC 30 ASCQ 03 e Operator Medium Removal Request ASC 5A ASCO 01 e SValid e The SValid bit is set to 1 if the information in the Source Storage Element Address field is valid e Ifthe information is unknown the SValid bit is set to 0 Invert The Invert field is not supported and is set to 0 Source Storage Element Address The Source Storage Element Address represents the address of the last storage element that held the cartridge The SValid field indicates if this information is valid The format of an element descriptor for an element of the data transfer element type is shown in table 46 66 Quantum DX Series Software Interface Guide Table 46 Data Transfer Element Descriptor Chapter 2 Emulated Medium Changer SCSI Commands Read Element Status B8h Bit Byte 7 6 5 4 3 2 1 0 0 MSB Element Address 1 LSB 2 Reserved 0h Access Except ne Full 3 Reserved 00 4 Additional Sense Code 5 Additional Sense Code Qualifier LU 6 Not Bus Rsrvd ID Valid Valid Rsrvd Logical Uni
263. these fields indicates the move may or may not be valid depending on the particular element requested The DX Series system does not support the Exchange Medium command Bytes 12 through 15 in this parameter page contain the individual fields specifying the DX Series system exchange capabilities Since the DX Series system has no exchange capability all of these fields are 0 The format for Mode Sense Vendor Unique Page 20h is shown in table 36 Bit Byte 7 6 5 4 3 2 1 0 0 PS 1 Rsvd 0 Page Code 20h 1 Page Length 02h 2 Reserved 00h SER AC DLR 3 Reserved 00h ADU EXB PS Parameters Savable This bit is always set to 1 indicating that this page can be saved to nonvolatile memory e Page Code The page code value of 20h is used to indicate a vendor unique page in page format e Page Length The page length is fixed at a value of 2 bytes e SER This bit enables Drive Serialization which enables reporting the drive serial numbers in the Alternative Volume Tag AVoltag field of the drive Read Element Status The default setting is Enabled Quantum DX Series Software Interface Guide Chapter 2 Emulated Medium Changer SCSI Commands Mode Sense 1Ah AC Auto Clean e If this bit is set to 1 the current state of automatic drive cleaning is enabled e When it is set to 0 the feature is disabled DLR Drive Load Retry This bit is ignored Can be set to 1 or 0 for compa
264. tiator that were reserved with the same Reservation ID value as this release attempt and that meet 3rd party release requirements if applicable e Flag Bit The Flag bit is used in conjunction with the Link bit to notify the initiator in an expedient manner that a command has been completed Flag bits are not supported by the DX Series system e Link Bit A Link bit set to 1 indicates that the initiator requests continuation of a task an I O process across two or more SCSI commands If the Link bit is 1 and the Flag bit is 0 and the task completes successfully the drive continues the task and returns a status of INTERMEDIATE and a LINKED COMMAND COMPLETE message If the Link bit and the Flag bit within a Control word are both set to 1 and the drive completes a command with a status of INTERMEDIATE the drive returns a LINKED COMMAND COMPLETE message with Flag Link bits are not supported by the DX Series system 72 Quantum DX Series Software Interface Guide Report LUNS AOh Table 49 Report LUNS Command Chapter 2 Emulated Medium Changer SCSI Commands Report LUNS AOh The Report LUNS command requests that the peripheral device logical unit numbers of known logical units in the target be sent to the applications client The command only returns information about the logical units to which commands may be sent Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code A0h 1
265. tibility ADU Auto Drive Unload e When bit is set to 1 the DX Series system unloads a tape drive as part of the Move Medium command default condition e When set to 0 the auto drive unload feature is disabled Quantum DX Series Software Interface Guide 49 Chapter 2 Emulated Medium Changer SCSI Commands Move Medium A5h Move Medium A5h Table 37 Move Medium Command 50 The host uses the Move Medium command to move a tape cartridge from one element to another within a DX Series system The host specifies the source element and the destination element in the command block The DX Series system then moves the tape cartridge contained in the source element to the empty destination element If the Mode Select Data ADU auto drive unload bit is set to 1 and the source element is a tape drive the DX Series system unloads the tape drive as part of the Move Medium command The source and destination elements can be of any type storage medium transport import export or data transport element The valid combinations of source element type and destination element type are summarized in the Mode Sense Device Capabilities Parameter Page see table 35 If a valid source element type and destination element type are specified the command is valid but the operation may still not be possible In this case the DX Series system returns check condition status and sets the sense key to Illegal Request The Additional Sense Code an
266. tion is being returned ready import command Provided on this unit for compatibility with existing libraries and provides no function on this DX Series release command Releases the DX Series or elements that match the specified release parameters Quantum DX Series Software Interface Guide 315 Glossary 316 request sense command Allows the host to receive sense data from the DxX Series request volume element address command Reports the element descriptors found by a Send Volume Tag command reserve command Reserves the specified DX Series or elements for exclusive use by the requesting initiator or another specified SCSI device rezero unitcommand Allows the host to home all DX Series mechanisms RS 232 A serial communications cabling and protocol standard for nine pin connectors save data pointer message When data transfers are broken into multiple connections the DX Series will send this SCSI 2 message before disconnecting from the host SCSI Small Computer System Interface A communications standard for attaching peripheral equipment to small computers send diagnostic command Performs a self test on the DX Series Quantum DX Series Software Interface Guide A Auto drive unload feature enabling 34 Automatic drive cleaning feature enabling 33 Bus device reset message reserve command 95 C Commands initialize element status 13 initialize element status with range 14 inquiry 16 log sense
267. tor Quantum DX Series Software Interface Guide Chapter 3 Emulated DLT7000 SCSI Commands Rewind 01h Rewind 01h The REWIND command directs the tape drive to position the tape at the beginning of the currently active partition for DLT drives this is BOM Before rewinding the tape drive writes any write data that is in the buffer to the tape medium and appends an End of Data marker Table 206 REWIND Bit Byte 7 6 5 4 3 2 1 0 Command Descriptor Block Data Format 0 Operation Code 01h 1 Logical Unit Number Reserved Immed 2 4 Reserved 5 Unused Reserved Flag 0 Link 0 Table 207 REWIND Field Name Description Command Data Field Descriptions Immed Immediate If this bit is set to 1 the tape drive first writes any remaining buffered data to tape medium and adds an EOD marker It then returns status to the host before beginning the actual rewind operation If this bit is 0 status will be sent after the rewind has completed Tech Tip The immed bit is accepted but ignored in processing Tech Tip The immed bit is accepted but ignored in processing Quantum DX Series Software Interface Guide 257 Chapter 3 Emulated DLT7000 SCSI Commands Send Diagnostic 1Dh Send Diagnostic 1 Dh Table 208 SEND DIAGNOSTIC Command Descriptor Block Data Format Table 209 SEND DIAGNOSTIC Command Data Field Descriptions 258 The S
268. tor eee ecseeeceeeseeeeeeseecneeeeececseeeeeetaees 97 Rezero Unit COmMand iescscstcrctecies cbtececevsch tstusds a e 99 Send Diagnostic Command cece eeeeeeeeeeteeeneneeees 100 Selftest Bit Definition 0 eee cece eeesee tees cetetaneteeenenes 101 Send Volume Tag Command cesses eessseseseeeeeneesenes 102 Send Volume Tag Parameters cesses ee eeneeeeees 103 Test Unit Ready Command 00 0 0 eeeeeeseeesesenseseseeneeseseees 105 Supported SCSI Commands ieee cecrsseesseesesenseeneees 108 Command Descriptor Block Fields eee seers 110 Command Descriptor Block Field Descriptions 111 Command Descriptor Block Control Field Data Format 112 Command Descriptor Block Control Field Field Descriptions Smene sure atest hitens Aieti toate 113 Quantum DX Series Software Interface Guide xiii Tables Table 75 Table 76 Table 77 Table 78 Table 79 Table 80 Table 81 Table 82 Table 83 Table 84 Table 85 Table 86 Table 87 Table 88 Table 89 Table 90 Table 91 Table 92 Table 93 Table 94 Table 95 Table 96 Table 97 Table 98 Table 99 Status COMES wie cviscciscsescsastiedivesseiessecsdetvoscvevesenlbssguaccieycvesaseacbenge 114 DATA Phase Command Contents 0 0 0 0 ccceseeseeeeeeeeeees 116 ERASE COMMAND Descriptor Block Data Format 122 INQUIRY Command Descriptor Block Data Format 124 INQUIRY Command Descriptor Block Field Descriptions sie iesire neneiia eoe E
269. track pairs serial cartridge tape 20 0 GB DLTtape IV only 85937 bpi 52 quad pairs serial cartridge tape 35 0 GB Quantum DX Series Software Interface Guide 207 Chapter 3 Emulated DLT7000 SCSI Commands Mode Sense 6 10 1Ah 5Ah Field Name Description The density codes above are the preferred codes used to define density Additionally the codes listed below may be used though use of the Data Compression Page is preferred these codes are only returned if they were set using the MODE SELECT command note that the codes may be different than the code set using MODE SELECT if the selection was made while the tape was not at BOT 80h 62500 bpi 64 track pairs serial cartridge tape 10 0 GB DLTtape III 15 0 GB DLTtape II xt without compression 81h 62500 bpi 64 track pairs serial cartridge tape 20 0 GB DLTtape III 30 0 GB DLTtape IIxt with compression 82h 81633 bpi 64 track pairs serial cartridge tape 20 0 GB DLTtape IV without compression 83h 81633 bpi 64 track pairs serial cartridge tape 40 GB DLTtape IV with compression 84h 85937 bpi 52 quad tracks serial cartridge tape 35 GB without compression 85h 85937 bpi 52 quad tracks serial cartridge tape 70 GB with compression 208 Quantum DX Series Software Interface Guide MODE SENSE Mode Pages Table 160 MODE SENSE Page Descriptor Data Format Chapter 3 Emulated DLT7000 SCSI Commands Mode Sen
270. ts Action code 05h e Byte Count of Report Available This field indicates the number of bytes of element status page data available for all elements meeting the request in the command descriptor block From 0 to 4 Element Status Pages can be returned One page is returned for each type of element with status information Each page contains a header and 1 or more element descriptors Each element descriptor reports the status for a single DX Series system element Quantum DX Series Software Interface Guide 83 Chapter 2 Emulated Medium Changer SCSI Commands Request Volume Element Address B5h Table 55 Element Status Page 84 The page header bytes 0 7 contains information that defines the contents of the element descriptors for the elements of that type The format of a status page is shown in table 55 Bit Byte 7 6 5 4 3 2 1 0 0 Element Type Code 1 PVolTag a Reserved 00h 2 MSB Element Descriptor Length 3 LSB 4 Reserved 00h 5 MSB 6 Byte Count of Descriptor Data Available 7 LSB 8 X One or More Element Descriptors PVolTag e A Primary Volume Tag field value of 1 indicates the Primary Volume Tag Information field is present in each of these element descriptor blocks e A value of 0 indicates that these bytes are omitted from the element descriptors that follow AVolTag Alternate Volume Tag is not supported This field is set to 0 Element Descriptor Length This field
271. wo categories of data in response to an INQUIRY command Standard Inquiry Data and Vital Product Data Standard Inquiry Data contains basic data about the drive and Vital Product Data comprises several pages of additional data Each Vital Product Data page requires a separate INQUIRY command from the initiator An INQUIRY command is not affected by nor does it clear a Unit Attention condition Bit Byte 7 6 5 4 3 2 1 0 0 Operation Code 12h 1 Logical Unit Number Reserved EVPD 2 Page Code 3 Reserved 4 Allocation Length 5 Unused Reserved Flag 0 Link 0 Quantum DX Series Software Interface Guide Table 79 INQUIRY Command Descriptor Block Field Descriptions Field EVPD Chapter 3 Emulated DLT7000 SCSI Commands Inquiry 12h Description Enable Vital Product Data If 0 the drive returns the Standard Inquiry Data page If 1 the drive returns the Vital Product Data page specified in Page Code Page Code Specifies which Vital Product Data page is to be returned by the drive This field must be 0 if EVPD is 0 A CHECK CONDITION with ILLEGAL REQUEST status is returned if this field specifies an unsupported page code Table 80 lists the page codes for the Vital Product Pages supported by the drive Allocation Length Specifies the number of bytes of inquiry information the drive is allowed to return to the initiator during the command s DATA IN pha
272. y data and the serial number field from the Serial Number Inquiry Page 2h Canonical form of the IEEE Extended Unique Identifier 64 bit EIU 64 3h FC PH Name_Identifier 4h to fh Reserved Table 18 Device Identification VPD Bit Byte 7 6 5 4 3 2 1 0 Logical Unit 0 Protocol Identifier 0 Code Set 2 1 Rsvd 0 Association 0 Identifier Type 1 2 Reserved 0 3 Identifier Length n 3 MSB 4 n Vendor and Product ID Serial Number LSB 24 Quantum DX Series Software Interface Guide Table 19 Device Identification VPD World Wide Name Chapter 2 Emulated Medium Changer SCSI Commands Inquiry 12h Bit Byte 7 6 5 4 3 2 1 0 0 Protocol Identifier 0 Code Set 1 1 Rsvd 0 Association 0 Identifier Type 2 2 Reserved 0 3 Identifier Length 8 MSB 4 11 IEEE extended Unique Identifier LSB Quantum DX Series Software Interface Guide 25 Chapter 2 Emulated Medium Changer SCSI Commands Log Sense 4Dh Log Sense 4Dh The Log Sense command see table 20 retrieves statistical information maintained by the logical unit Data is returned from the logical unit in the Medium Changer Statistics Page see table 22 Table 20 Log Sense Bit Byte 7 6 5 4 3 2 1 0 Command 0 Operation Code 4Dh 1 Logical Unit Number Reserved 0 PPC 0 SP 0 2 PC 1 Page Code 3 Reserved 0000h 4 5 MSB Parameter Pointer 6 LSB 7 MSB All

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