High Availability Cluster/iX User`s Manual
Contents
1. Secondary System When the primary host system experiences an outage a switchover operation must be initiated The currently active secondary system needs to take ownership of all the cluster volume sets that the primary host system owned This is termed as taking control or switchover of a cluster volume set which is mounted as loner on the secondary system This is accomplished by the SxOSETLABEL command within SXOutil and followed by issuing the VSOPEN command The currently active secondary system overrides the Ownership Label on the disks owned by the primary host system and assigns its Ownership Label on the disks owned by the primary host system Only then can the active secondary system mount or VSOPEN the cluster volume set On the completion of the switchover operation these volumes will be mounted as master and member volumes respectively on the currently active secondary system Once the secondary system has taken control of the cluster volume sets reboot the primary system and verify that the cluster volume sets are automatically mounted as loner within the primary host system Configuration Restrictions It is IMPORTANT to note that when a Ownership Label is being created or being reset to the secondary active system the other system should be shutdown or must have done a VSCLOSE of the volume set Recreating a volume set and converting to a cluster volume set shoul2. prevents two systems from trying to mount the same volume set simultaneously Thus disk operations are allowed only on disk volumes owned by the system NOTE The operator is responsible for verifying that this computer is the only one that has access to the volume set until after the volume set has been created and the data structures built using this command After these structures are built the system administrator can then configure Idevs on the other computers that will bein the cluster configuration Chapter 1 9 High Availability Cluster ix SXOSETLABEL SXOSETLABEL The SXOSETLABEL command is used to assign switch a user defined Ownership Label on the master volume of the volume set The value of the HPSUSAN and Root UFI D of the Idev 1 is the default value for the Ownership Label This command can be initiated from any system belonging to the cluster The default value of the Ownership Label will be assigned only to cluster volumes previously created by any system on this cluster The MASTER volume should be in LONER state to execute this command This operation is also known as switchover 10 Chapier 1 High Availability Cluster ix SXOREMOVELABEL SXOREMOVELABEL The SXOREMOVELABEL command removes the Ownership Label from the cluster volume set thus converting it into non cluster volume set SXOutil also allows the execution of all Cl commands and other utilities withi
3. High Availability Cluster iX User s Manual HP e3000 MPE iX Computer Systems Edition 1 invent Manufacturing Part Number B9480 90003 E 0802 U S A August 2002 Notice The information contained in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with regard tothis material including but not limited to the implied warranties of merchantability or fitness for a particular purpose Hewlett Packard shall not be liable for errors contained herein or for direct indirect special incidental or consequential damages in connection with the furnishing or use of this material Hewlett Packard assumes no responsibility for the use or reliability of its software on equipment that is not furnished by Hewlett Packard This document contains proprietary information which is protected by copyright All rights reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws Restricted Rights Legend Use duplication or disclosure by the U S Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 Rights for non DOD U S Government Departments and Agencies are as set forth in FAR 52 227 19 c 1 2 Acknowledgments UNIX is a registered trademark of The Open Group Hewlett Packard Company 3000 Hanover S
4. T GEN MPEXL_SYSTEM_VOLUME_SET 0 ET1 is a cluster MPEXL_SYSTEM_VOLUME_SET 0 SXO_SET SXO_SET SXO_SET SXO_SET SXO_SET SXO_SET SXO_SET SXO_SET 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Chapter 1 High Availability Cluster ix Error Handling Error Handling In addition to the normal command parsing errors and illegal command errors from the utility SXOutil the following new errors pertaining to the creation and manipulation of the cluster block are introduced MESSAGE Cluster label exists already cannot create another one CAUSE This error is returned while executing the command SXOMAKELABEL This error indicates that an initial Cluster Ownership ID block has already been created by invoking the command SXOMAKELABEL ACTION You only can reset this label to the current system by invoking the command SXSETLABEL If there is a need to re create the Cluster ID block then issue the SXOREMOVELABEL command first MESSAGE Volume mounted in invalid state for desired operation CAUSE The command failed because the volume is mounted in a wrong state ACTION The volume should bein MASTER state in order to create SXOMAKELABEL the Cluster Ownership ID block as well as to purge SKOREMOVELABEL it It should be in LONER state to reset SXOSETLABEL to the current system MESSAGE Volume not a member of the set bein
5. d be done only when the primary system can see the volumes Failure to do so will cause the secondary to have stale data on its system data structure forcing a reboot to refresh the structures Chapier 1 7 High Availability Cluster ix SXOutil SXOutil This phase of the Cluster iX product consists of a utility program called SXOutil that is used to create and initialize a master member of the cluster volume set In addition it provides other commands that grant access tothe cluster volume set from any computer within the duster configuration NOTE The user requires CV create volumes or SM system manager capability to execute the commands within SXOutil The following commands are currently available in SXOutil For a complete description of the command and its usage please refer to the help facility within SXOutil 8 Chapter 1 High Availability Cluster ix SXOMAKELABEL SXOMAKELABEL The SXOMAKELABEL command is used to create the cluster data structure which indude Ownership label associated audit trail information and history records Ownership Label consists of the unique HPSUSAN number of the system and the Root UFID of the System Volume Set This command will set the Ownership Label to that of the computer where the command was issued The Ownership Label is assigned only to the MASTER volume of the volume set created and not the member volumes Creation of Ownership Label
6. d working system where the users can then gain access to the critical data through the backup or secondary computer The Cluster iX product will continue using the benefits of MPE s transaction management to rebuild system data structures and database facilities like IMAGE to ensure no or minimum loss of data Chapier 1 5 High Availability Cluster ix Requirements Requirements Hardware Requirements The hardware consists of multiported arrays like the XP family or 12H connected to multiple computers where each port has access to the drives on the other port Limitations e Clusteri X does not migrate user entries IP addresses nor user group capabilites The system implementor must script these features NOTE The Heartbeat facility is no guarantee that the primary system is down Care must be exercised in developing job scripts to cause a switchover to the secondary computer e Cluster iX will not be supported on System Volume Sets e Only user volume sets are allowed to be cluster volume sets e Cluster iX is not supported with path failover for the first release e Cluster iX is not supported on Mirrored disks e Cluster iX is not supported on split volume sets e Cluster iX does not support data sharing 6 Chapier 1 High Availability Cluster ix Configuration Configuration Once the Cluster iX product is installed perform the following steps to configure the systems and to convert the required user volume
7. er can take over ownership of the cluster volume set Once installed the Cluster iX utility provides continued access to data on high availability disk array products like the SureStore E Disk Array XP 256 XP 48 XP512 VA7100 and any other supported dual ported arrays Chapter 1 High Availability Cluster ix Product Description Product Description The configuration consists of multiported arrays connected to multiple computers as shown in Figure 1 1 where each port has access to the drives on the other port Any single computer in this topology has direct access to the cluster volume set but all the computers in the topology agree on a single owner All access to the data goes through the computer that owns the volume set In the event that the owner computer encounters a failure another computer in the cluster topology can take over ownership of the cluster volume set The system volume set can not be configured as a cluster volume set Figure 1 1 Cluster iX Cien LAHN clueber olle sals that are recognized by both compubeje Volume Sat cluster volume set HP Aurestore E Disk Array XF256 or any FP supported dual ported array 4 Chapter 1 High Availability Cluster ix Benefits Benefits The purpose of this product is to reduce planned or unplanned downtime caused by having a system outage while that system owns critical business data The plan is to move or switch the data user volume set onto an up an
8. g initialized Ez ABEL Or CAUSE There is a mismatch between the setname and the Idev being passed to the SXOMAKE SXOSETLABEL command ACTION Cluster Ownership ID block can be created or reset only on the master volume of a volume set MESSAGE Cluster ID is invalid for system volume set CAUSE Cluster Ownership ID block is valid only for user volume sets MESSAGE Cannot RESET because no Cluster label is found CAUSE Cluster D block needed to be created before it can be reset to the current system ACTION Issue the command SXMAKELABEL before issuing SXOSETLABEL command MESSAGE Cannot purge Cluster label not initialized CAUSE J ust a warning to indicate that the volume set is not switchable ssue SXOMAKELABEL command to create the Cluster ID block before accessing the block using other commands MESSAGE Insufficient capabilities to execute this command CAUSE User does not have proper capability to execute this command ACTION User requires either CV or SM capability to execute Cluster iX commands Chapier 1 15 High Availability Cluster ix Error Handling 16 Chapier 1
9. n this utility In addition to the above commands SXOutil provides the following commands e Listredo e Redo e Help Log e Verify e Exit Chapier 1 11 High Availability Cluster ix SXOBEAT SXOBEAT The SXOBEAT command is used to increment or change the heartbeat counter on the cluster volume set for any SXOLISTEN commands that may be monitoring it When SXOBEAT is used in a job script the job will behave as if it is hung at that location until the job is aborted or if the SXOBEAT command detects that the Ownership Label has changed Extraordinary steps should be taken in the event that SxoBEAT detects that the ownership has changed These steps should included the immediate cessation of all O to the volume set and immediate closure of the volume set or an immediate reboot of the system 12 Chapier 1 High Availability Cluster ix SXOLISTEN SXOLISTEN The SXOLISTEN command is used to monitor or listen to the heartheat counter on the cluster volume set The command will pause until such time as the heartbeat stops When it defects that a heartbeat has not happened within the tineframe passed in as a parameter the command will fall through and continue processing the job script The Listen job script should be designed to alert the system administrator and to not assume that because the heartbeat stopped that the system is down Other tests should be part of the decision process before ha
10. set to a cluster volume set 1 Connect the primary and the secondary systems to a multiported volume set but only configure the Idevs for the primary system leaving the configuration of the secondary system for later 2 Verify that the MPE program SXOutil and the catalog SXCAT000 are properly installed in the group PUB SYS for the primary and secondary systems by using the LISTF command 3 Using the duster utility SXOutil create cmd SXOMAKELABEL the Cluster ID block on the primary system This will convert your volume set into a duster volume set Please refer to the help facility within SXOutil for more details about the command 4 VSCLOSE the newly created cluster volume set 5 VSOPEN the cluster volume sets Every cluster volume set can be owned by only one system belonging to the cluster at any time The system that initiates creation of the cluster volume set will be the initial owner of the disk and is allowed to perform disk operations on these disks after mounting VSOPENinNg 6 Execute the DSTAT command to verify that the cluster volume sets are created properly DSTAT will display all cluster volume sets as MASTER SX amp MEMBER SX 7 Configure the Idevs on the secondary system by using SYSGEN or TOCONFIG As each of the drives is recognized by the operating system they will mount automatically as LONER Neither vsoPEN nor VSCLOSE should change the state from the secondary computer
11. treet Palo Alto CA 94304 U S A Copyright 2002 by Hewlett Packard Company 1 High Availability Cluster X Product Description a a ias 4 Benefits ic eda beeen ted ed aw Pde bees ede ee ie eed hed a ee ah Peek ote be dete eee 5 Requirements JE he wa atta aii Gia a BG OS Bees Bea da Eee 6 Hardware Requirements si arri aeea aa ra A E eee eens 6 LIMA ONS ers aiaa aae a sitas a e 6 Configuratio oca a eee AE A ee ae ee 7 Secondary SYStOM se eek eee en Ee ee A AR se ede De 7 Configuration Restrictions 4 4 05 Shes 4 ee eo aie Ga Ga ee ee ek kare Pee 7 SAQUE es Ahhh id mien arms om irate Ania rola rad mum were Meares BA hte ate 8 SXOMAKELABEL seca a be hie ab a y ben EAA eee a Be BE ad ee a 9 SXOSERLABE Ln A a ro dys 10 SXOREMOVELABEL rias ee eee ee eed ve Oe vee E ee oe 11 SXOBEA Mii pasa aoe ea tiated ant aaa waa ees ou hee ies 12 SXOLISTEN coo toi Sees bea Sek en Vth Vd din Vive En Bee eee a 13 Examples of Beat and Listen J ob Scripts 0 0 0 cect eee 13 DSTAT a A a to a Ate eth 14 Error Handling sta a A a Ge EE Aids we ds Baie a 15 1 High Availability Cluster iX This guide documents the High Availability Cluster iX utility for the HP e3000 systems The Cluster iX product allows multiple computers to physically connect to a single set of disks which are configured using the Cluster iX utility to control cluster volume sets In the event that the owner computer encounters a failure another computer in the dust
12. ving a job script make the final decision of taking over a cluster volume set Examples of Beat and Listen J ob Scripts Job beat manager sys rsxOutil Verify off Sxobeat RES_DBSET 50 2 Exit comment If beat terminates Emergency close volumes comment because the other machine accidentally took over VSCLOSE RES_DBSET now TELLOP Help me mister wizard TELLOP Log onto secondary system and verify data base integrity lEoj Job listen manager Comment This job will check every 2 seconds for a heartbeat Comment If after 2 minutes no heartbeat detected takeover SXOutil Verify off SXOListen RES_DBSET 50 2 120 Exit comment Heartbeat stopped comment Take over volume set IsXOutil verify off SXOsetlabel RES_DBSET 50 Exit VSOPEN RES_DBSET Stream IPMigrat Job Sys Stream Launch App Sys TELLOP Ready to go Istream Jbeat job sys EojJ Chapter 1 13 High Availability Cluster ix DSTAT DSTAT DSTAT has been changed to display cluster volume type as shown here In this example Sxo_s volume set dstat all LDEV TYPE SATUS 1 C2247M1 MASTER 2 C3010M1 30 C5447A ASTER SX 31 C5447A EMBER SX 32 C5447A EMBER SX 34 C5447A EMBER SX 35 C5447A EMBER SX 36 C5447A M M M M 33 C5447A MEMBER SX M M MEMBER SX M 37 C5447A EMBER SX 14 VOLUME MEMBER1 MEMBER MASTER1 MEMBER1 MEMBER2 MEMBER3 MEMBER4 MEMBERS MEMBER6 MEMBER7 VOLUME SE
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