Q-Logic Router ISR6250 User's Manual
Contents
1. Remote Destination Migration Remote Device Connectivity Topology Source Array Array Method Topology 1 Fibre Channel or Fibre Fibre Channel Online or iSCSI presented targets see Section Channel over Ethernet or FCoE offline 6 1 or Fibre Channel over IP FCIP FCoE see Section 6 2 2 Fibre Channel or FCoE iSCSI Online or Native iSCSI see Section 6 3 offline 3 iSCSI Fibre Channel Offline iSCSI presented targets or FCIP see or FCoE Section 6 4 4 iSCSI iSCSI Offline Native iSCSI 4 Configuration The following sections describe the configuration for remote data migration E 4 1 Performing Remote Migration E 4 2 Configuring Local and Remote iSR6200 Routers for iSCSI Presentation E 4 3 Discovering Remote Devices Through FCIP 4 1 Performing Remote Migration To perform remote data migration follow the steps in the Data Migration Service for iSR6200 User s Guide s chapter on performing data migration except for discovering the destination LUNs for migration This exception applies to the following topologies E If you are using Topology 1 see Section 6 1 or Topology 3 see Section 6 3 follow the steps in Section 4 2 for discovering your destination migration LUNs E If you are using FCIP see Section 6 2 establish the FCIP link and then follow the steps in the Data Migration Service for iSR6200 User s Guide s chapter on performing data migration N0051424 00 B 2 4 Configuration TO Ez 4 2 Co2. to set the array type and license the array if required Q For Use Case 2 the discovered iSCSI target paths appear on the previously existing array with Fibre Channel paths The Fibre Channel paths are offline and the iSCSI paths are online The local router can now access the LUNs through the iSCSI paths 4 3 Discovering Remote Devices Through FCIP The iSR6200 also provides an FCIP feature to discover remote devices You can use one iSR6200 on each site to create FCIP links and an additional router for migration After Fibre Channel switches are linked using FCIP the remote Fibre Channel devices are available just like any other Fibre Channel device The iSR6200 used for migration cannot differentiate between a remote or local Fibre Channel device 5 Best Practices For more information on general data migration best practices see the Data Migration Service for iSR6200 User s Guide The following guidelines describe the best practices E Start online remote migration jobs during off peak hours E Ifthe destination LUN is a thin provisioned LUN do the following Q Create new LUNs on the destination site UO Inthe GUI s Data Migration Jobs Options dialog box select the TP Setting option of Yes without TP Validation which does not copy zero blocks E When using two iSR6200 routers one at a local site and one at a remote site set the migration I O size to 64kB This setting accelerates writes by reducing the latencies in
3. XX LOGIC The Ultimate in Performance Application Note Remote Data Migration for iSR6200 Products Affected QLogic Storage Router iSR6240 iSR6250 iSR6260 1 Introduction This application note provides instructions for performing remote data migration using the QLogic iSR6200 Series of intelligent Storage Routers listed in the Products Affected table These routers are collectively referred to as the iSR6200 throughout this application note The iSR6200 command line interface is referred to as the CLI and the SANsurfer Router Manager utility is referred to as the GU throughout this document Remote data migration jobs are run as asynchronous mirror operations During the initial copying phase of remote online migration the iSR6200 tracks I Os occurring in the already copied blocks by creating dirty region logs DRLs Remote online migration also keeps track of the I Os after the initial copying phase and creates DRLs The DRLs are stored in the data management LUN DML After the initial copying phase is complete the DRLs are flushed continually 2 Prerequisites Before configuring remote data online migration jobs you must configure the DML on the iSR6200 If you choose to migrate to a remote array in the offline mode you need not create a DML DMLs created on one blade are available for remote migration jobs across both blades You can configure up to eight LUNs as DMLs The maximum supported DML capacity i
4. d on the available bandwidth round trip time RTT and change rate for data under migration This worksheet uses the available bandwidth and change rate to provide an estimate for how much data can be migrated online remotely This calculation assumes that application cut over starts on Day 6 and Day 7 of the week To calculate the weekly total GB of data migrated type the appropriate values in the Dedicated Bandwidth Mbps and Change Rate for Data Under Migration cells The results are shown in the Available Bandwidth per Day GB Day and Weekly Total GB cells 2 M edinin ene re ime per Day GB Day 4 500 10 Weekly S Migration schedule for one week Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Total GB 6 Base migration to be scheduled GB 3 305 3 342 3 007 2 707 2 436 z Changes GB day 330 665 965 1 236 1 480 8 Available bandwidth GB Day 3 672 3 672 3 672 3 672 3 672 3 672 a Figure 5 1 Example Time Line for Remote Migration Project 6 Remote Migration Topology Examples The following sections illustrate various remote migration topologies E 6 1 Fibre Channel to Fibre Channel Remote Online and Offline Migration Using iSCSI Presented Targets E 6 2 Fibre Channel to Fibre Channel Remote Online and Offline Migration Using FCIP E 6 3 Fibre Channel to iSCSI Remote Online and Offline Migration E 6 4 iSCSI to Fibre Channel Remote Offline Migration SN0051424 00 B 6 6 Remote Migration Topology Examples 6 1 Fibre Channel to Fib
5. e Channel to Fibre Channel topology shown in Figure 6 2 supports both online and offline remote migration For offline migration the servers accessing the source LUN must be shut down and do not require a DML QLogic iSR62x x Migration Appliance Local Site Remote Site ei hannel 0 00 00 c0 dd 13 a0 f4 FCIP_ 00 cO dd 13 a0 f4 QLogic iSR62xx This diagram shows how FCIP can be used for online data migration from a local device with WWPN 21 00 00 c0 dd 13 a0 f4 to remote device with WWPN 21 00 00 c0 dd 13 a1 f8 The migration appliance iSR6250 sees the remote devices on the local Fibre Channel switch through FCIP Figure 6 2 Fibre Channel to Fibre Channel Remote Online and Offline Migration Using FCIP SN0051424 00 B 8 6 Remote Migration Topology Examples 6 3 Fibre Channel to iSCSI Remote Online and Offline Migration The Fibre Channel to iSCSI topology shown in Figure 6 3 supports both online and offline remote migration For offline migration the servers accessing the source LUN must be shut down and do not require a DML iqn 2001 05 com vendorx 0 8a0906 e7f879f09 1b92 1083d6e4d55a migration iii _ Sa QLogic iSR62xx Migration Appliance Local Site N Fibre Channel m WWNN zonder 1 00 WWPN 00 cO dd 13 a0 F4 gt Fibre Channel sa Fibre Channel sA Storage i i E ra 0906 e7f879f09 1b9Z1963d6e4d55a migration 100gb x Sy iSCSI Disc
6. e for the round trip time RTT and bandwidth to the remote iSR6200 8 On the local iSR6200 issue the iscsi discover command in the CLI or use the Discover iSCSI Target Wizard in the GUI to discover the remote iSR6200 iSCSI port IP address 9 Verify that the remote iSR6200 shows the local iSR6200 router s iSCSI qualified name IQN by issuing the show initiators iSCSI command in the CLI or by viewing the Discovered iSCSI Initiator node in the GUI 10 Provide the destination LUN access to the local iSR6200 by following one of these options oO Disable LUN masking on the remote router using the set system command in the CLI a reboot of the remote iSR6200 blades is required OY Mask LUNs using the Target Presentation LUN Mapping Wizard on both blades of the remote iSR6200 presenting the destination LUNs to the local iSR6200 iSCSI initiator IQN On the local iSR6200 log in to the remote iSR6200 iSCSI targets by issuing the iscsi login command in the CLI or by selecting the targets in the iSCSI Discovered Targets node on the router tree in the GUI 12 Repeat the login using multiple local and remote iSR6200 iSCSI ports to enable multipathing between the local and remote iSR6200s 1 SN0051424 00 B 3 5 Best Practices TO _SESELSESE__LZ 13 After successfully logging in you see the LUNs on the logged in target as follows Q For Use Case 1 a new array object is formed Issue the set array command
7. nfiguring Local and Remote iSR6200 Routers for iSCSI Presentation To configure local and remote iSR6200 routers for iSCSI presentation follow these steps 1 Identify the destination array ports to use for remote migration 2 Zone the destination array controller ports with remote iSR6200 Fibre Channel ports 3 Register the remote iSR6200 Fibre Channel ports and provide access to the LUNs on the destination array 4 Rescan the targets on the remote iSR6200 to discover the LUNs that were mapped to iSR6200 Fibre Channel ports on the array NOTE Some arrays do not allow an iSR6200 Fibre Channel port to port log in PLOGI to its Fibre Channel ports if there are no LUNs mapped to the Fibre Channel port that is logging in You must generate a registered state change notification RSCN to iSR6200 Fibre Channel ports by disabling and then re enabling all connected Fibre Channel ports on iSR6200 blades 5 Ensure that the destination LUNs are mapped to the remote iSR6200 by issuing the show luns command on the CLI or by selecting the FC Discovered Targets or the iSCSI Discovered Targets node in the GUI s router tree to see the LUNs 6 Configure the IP addresses gateway and subnet mask in the iSCSI interface s on the remote iSR6200 7 Configure the iSCSI interface s on the local iSR6200 as follows a Configure the IP addresses gateway and subnet mask b Set the iSCSI maximum first burst to 64K c Configure the TCP window siz
8. nt Revision History Revision A November 14 2011 Revision B December 6 2011 Made minor edits to improve readability Modified and attached the bandwidth calculation spreadsheet and updated the Figure 5 1 screen shot of the spreadsheet Updated the 6 Remote Migration Topology Examples graphics Corporate Headquarters QLogic Corporation 26650 Aliso Viejo Parkway Aliso Viejo CA 92656 949 389 6000 www glogic com QLOGIC International Offices UK Ireland Germany France India Japan China Hong Kong Singapore Taiwan 2011 QLogic Corporation Specifications are subject to change without notice All rights reserved worldwide QLogic the QLogic logo and SANsurfer are trademarks or registered trade marks of QLogic Corporation Microsoft and Excel are registered trademarks of Microsoft Corporation All other brand and product names are trademarks or registered trademarks of their respective owners Information supplied by QLogic Corporation is believed to be accurate and reliable QLogic Corporation assumes no responsibility for any errors in this brochure QLogic Corporation reserves the right without notice to make changes in product design or specifications SN0051424 00 B 11
9. over the remoteiSCSI target on the local router Storage This diagram shows online data migration from local Fibre Channel device WWPN 21 00 00 c0 dd 13 a0 f4 to remote iSCSI device iqn 2001 05 com vendorx 0 8a0906 e7f87 9f09 1b921083d6e4d55a migration 100gb x iqn 2001 05 com vendorx 0 Figure 6 3 Fibre Channel to iSCSI Remote Online and Offline Migration SN0051424 00 B 6 Remote Migration Topology Examples 6 4 iSCSI to Fibre Channel Remote Offline Migration The iSCSI to Fibre Channel topology shown in Figure 6 4 supports only offline migration The iSR6200 does not currently support online data migration when the source LUN is from an iSCSI target ign 2004 08 com glogic isr6200 0823e00013 b1 01 210000c0ddi3aif8 Discovered Target QLogic iSR62 xx Migration Appliance Site 1 a Sea EUN iscsl S S Hosts should not use Sg storage for offline migration gt E scs iSCSI Storage he ia 210000c0ddi3a1f8 Presented Target QLogic iSR62xx JA Fibre Channel A Fibre Channel Storage WWNN 20 00 00 c0 dd 13 a1 f8 WWPN 21 00 00 cO dd 13 a1 f8 Discover Fibre Channel devices from Site 2 in Site 1 using iSCSI presentation mechanism This diagram shows how iSCSI presentation can be used for offline data migration from an iSCSI device in Site 1 to a Fibre Channel device in Site 2 Figure 6 4 iSCSI to Fibre Channel Remote Offline Migration N0051424 00 B 10 Docume
10. ration This spreadsheet provides an estimate of how much data can be migrated online remotely per week using the available WAN bandwidth and specified change rate It also indicates a timetable on when to start migrations This method assumes that the application cut over to the destination starts on Day 6 and Day 7 of the week In the spreadsheet you must enter the following highlighted values O Dedicated Bandwidth Mbps the bandwidth of the WAN link used to connect the source and destination in Mbps Q Change Rate for Data Under Migration the rate at which the source LUN changes The calculation is B4 10 x3600x24x85 1000 where B4 is equal to the dedicated bandwidth of the configuration whatever is available 10 is the change of rate for data under migration 3600 is the number of seconds in an hour 60 seconds per minute x 60 minutes per hour 24 is the number of hours per day 85 is the percentage of bandwidth efficiency Dividing by 1000 gives a result in GB The result is the weekly total GB migrated In the example depicted in Figure 5 1 you start with 3 305GB of migration on Day 1 3 342GB of migration on Day 2 and so on Assuming that the 500Mbps bandwidth entered is available the cut over to the destination is possible on Day 6 or Day 7 SN0051424 00 B 5 6 Remote Migration Topology Examples TO EES a R Timeline for Re e jration Project A B C D E F G H Remote data migration projects depen
11. re Channel Remote Online and Offline Migration Using iSCSI Presented Targets The Fibre Channel to Fibre Channel topology shown in Figure 6 1 supports both online and offline remote migration For offline migration the servers accessing the source LUN must be shut down and do not require a DML iqn 2004 08 com qlogic isr6200 0823e00013 b1 01 210000c0dd13a1f8 Discovered Target QLogic iSR62xx Migration Appliance Local Site Remote Site nee Fibre Chi nel g aa _ WWNN X 00 00 c0 0 c0 dd 13 a0 f4 WWPN 21 00 00 c0 dd 13 a0 f4 Fibre Channel i e Channel iqn 2004 08 com qlogic isr6200 0823e00013 b1 01 ee D Storage Presented Target Logic iSR62xx 7 WY i Fibre Channel WWNN 20 00 00 cO dd 13 a1 f8 WWPN 21 00 00 c0 dd 13 a1 f8 Discover remote device on the local site using iSCSI presentation mechanism This diagram shows how iSCSI presented targets can be used to do online data migration from i the local device WWPN 21 00 00 c0 dd 13 a0 f4 to a remote device with WWPN Fibre Channel 21 00 00 c0 d 13 a1 f8 through iSCSI presentation from the remote routers Storage Figure 6 1 Fibre Channel to Fibre Channel Remote Online and Offline Migration Using iSCSI Presented Targets SN0051424 00 B 6 Remote Migration Topology Examples TO ESESESES gt S gt __ 6 2 Fibre Channel to Fibre Channel Remote Online and Offline Migration Using FCIP The Fibr
12. s 2TB For more information see the Data Migration Service for iSR6200 User s Guide 3 Remote Migration Use Cases The iSR6200 supports the following use cases for remote migration Section 4 Configuration provides details on setting up the iSR6200 for these use cases E Use Case 1 The source array is at the local site and the destination array is at a remote site Use Case 1 typically applies to scenarios where the servers in a data center at Site A the local site are moved to a data center at Site B the remote site and the data storage associated with the servers are consolidated with existing or new storage arrays at Site B SN0051424 00 B 1 4 Configuration ls E Use Case 2 The source and destination arrays are at the local site initially For Use Case 2 after the initial copying operation the remote migration is moved to the remote site The iSR6200 supports a maximum of eight paths per array When using the topology described in Section 6 1 to connect to the remote array the array on the local site supports a maximum of four paths if the destination array is a Fibre Channel array The iSCSI presented targets are added as additional paths to the existing array when the local Fibre Channel array is moved to the remote site Table 3 1 summarizes the remote device connectivity topology for various combinations of supported source and destination array types Table 3 1 Remote Device Connectivity Topology
13. volved with the write command E Use the bandwidth limiting feature on the source array to throttle the migration which in turn limits the WAN link use E When using two iSR6200 routers issue the set iscsi command to manage the RTT and available bandwidth Tuning TCP window size based on the RTT is critical to enhanced migration performance You can calculate the typical window size in kB as follows WAN link bandwidth in MBps x RTT in ms Number of iSCSI connections between the iSR6200 and iSCSI target port of the storage array For example suppose the available WAN link bandwidth is 100MBps 1000Mbps the RTT is 20ms and there are two iSCSI connections between the iSR6200 blade and the iSCSI target ports on the storage array 100 x 20 1000kB TCP window size 2 Configure a 1MB window size on the iSR6200 and iSCSI target port The iSR6200 supports a maximum TCP window size of 16MB An iSCSI target array port may support larger TCP window sizes SN0051424 00 B 4 5 Best Practices TE S_A E Refer to the attached Timeline for Remote Migration Project xlsx spreadsheet to estimate the amount of data that can be transferred weekly based on the available bandwidth and change rate at the source NOTE The Timeline for Remote Migration Project xlsx file is a Microsoft Excel spreadsheet that is attached to this PDF Remote migration projects depend on the available bandwidth RTT and change rate for data under mig
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