IBM XIV Storage System Copy Services and Migration

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7.10.4 Back-out after a data migration has reached the synchronised stateIf the data migration shows in the GUI as having a status of synchronised, then thebackground copy has completed. In this case back-out can still occur because the datamigration is not destructive to the source LUN on the non-XIV storage device. Simply reversethe process by shutting down the host server or applications and restore the original LUNmasking and switch zoning settings. You may need to also reinstall the relevant host servermulti-path software for access to the non-XIV storage device.Important: If you chose to not allow source updating and write I/O has occurred during themigration or after it has completed, then the contents of the LUN on the non-XIV storagedevice do not contain the changes from those writes. Understanding the implications of thisis important in a back-out plan.7.11 Migration checklistThere are three separate stages to a migration cut over. First, prepare the environment for theimplementation of the XIV. Second, cut over your hosts. Finally, remove any old devices anddefinitions as part of a clean up stage.For site setup, the high-level process is:1. Install XIV and cable it into the SAN.2. Pre-populate SAN zones in switches.3. Pre-populate the host/cluster definitions in the XIV.4. Define XIV to non-XIV disk as a host.5. Define non-XIV disk to XIV as a migration target and confirm paths.Then for each host the high-level process is:1. Update host drivers and then shut down the host.2. Disconnect/un-zone the host from non-XIV storage and then zone the host to XIV.3. Map the host LUNs away from the host instead of mapping them to the XIV.4. Create XIV data migration (DM).5. Map XIV DM volumes to the host.6. Bring up the host.When all data on the non-XIV disk system has been migrated, perform site clean up:1. Delete all SAN zones related to the non-XIV disk.2. Delete all LUNs on non-XIV disk and remove it from the site.220 IBM XIV Storage System: Copy Services and Migration
Table 7-1 Physical site setupTable 7-1 shows the site setup checklist.TaskNumberCompletedWhere toperformTask1 Site Install XIV.2 Site Run fiber cables from SAN switches to XIV for host connectionsand migration connections.3 Non-XIV storage Select host ports on the non-XIV storage to be used for migrationtraffic. These ports do not have to be dedicated ports. Run newcables if necessary.4 Fabric switches Create switch aliases for each XIV Fibre Channel port and anynew non-XIV ports added to the fabric.5 Fabric switches Define SAN zones to connect hosts to XIV (but do not activate thezones). You can do this by cloning the existing zones from host tonon-XIV disk and swapping non-XIV aliases for new XIV aliases.6 Fabric switches Define and activate SAN zones to connect non-XIV storage to XIVinitiator ports (unless direct connected).7 Non-XIV storage If necessary, create a small LUN to be used as LUN0 to allocateto the XIV.8 Non-XIV storage Define the XIV on the non-XIV storage device, mapping LUN0 totest the link.9 XIV Define non-XIV storage to the XIV as a migration target and addports. Confirm that links are green and working.10 XIV Change the max_initialization_rate depending on the non-XIVdisk. You may want to start at a smaller value and increase it if noissues are seen.11 XIV Define all the host servers to the XIV (cluster first if using clusteredhosts). Use a host listing from the non-XIV disk to get the WWPNsfor each host.12 XIV Create storage pools as required. Ensure that there is enoughpool space for all the non-XIV disk LUNs being migrated.Once the site setup is complete, the host migrations can begin. Table 7-2 shows the hostmigration check list. Repeat this check list for every host. Task numbers that are colored redmust be performed with the host application offline.Table 7-2 Host Migration to XIV task listTasknumberCompleted?Where toperformTask1 Host From the host, determine the volumes to be migrated and their relevant LUNIDs and hardware serial numbers or identifiers.2 Host If the host is remote from your location, confirm that you can power the hostback on after shutting it down (using tools such as an RSA card orBladeCenter® manager).3 Non-XIVStorageGet the LUN IDs of the LUNs to be migrated from non-XIV storage device.Convert from hex to decimal if necessary.Chapter 7. Data migration 221
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Front coverIBM XIV Storage System:C
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Note: Before using this information
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7.9.4 Host server cannot access the
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viiiIBM XIV Storage System: Copy Se
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TrademarksIBM, the IBM logo, and ib
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Recovery Program at the Pentagon fo
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Comments welcomeYour comments are i
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1.1 Snapshots architectureBefore we
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A logical volume is represented by
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If you know in advance that an auto
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An application can utilize many vol
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Note: The creation date of the dupl
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Along with these properties, the tr
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The GUI also lets you specify the d
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pointers to the original data are l
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For the second scenario, the origin
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Figure 1-28 no longer displays the
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To examine the details of the scena
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Restriction: Volumes in a consisten
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When created, the consistency group
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The new snapshots are created and d
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To obtain details about a consisten
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Example 1-12 illustrates the snap_g
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1.5 MySQL database backup exampleMy
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Before running the backup script, a
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# XCLI command to perform the backu
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40 IBM XIV Storage System: Copy Ser
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2.1 OverviewThis section includes a
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Figure 2-2 shows the Tivoli Storage
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►For exchange data, the Microsoft
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2.4.1 XIV VSS Provider installation
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Provide specific information regard
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The Windows server is now ready to
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3. The Requirements Check dialog wi
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5. The completion window shown in F
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To perform a VSS snapshot backup of
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CLUSTERnodePASSWORDAccessNOGenerate
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To see a list of the available VSS
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64 IBM XIV Storage System: Copy Ser
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3.1 Volume copy architectureThe vol
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Figure 3-2 provides an example of t
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After the copy is complete, power u
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4.1 XIV Remote Mirroring overviewTh
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►Host read operations are perform
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Figure 4-4 shows remote mirror conn
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4.2.2 Operational proceduresMirrori
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After mirroring has been implemente
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4.3 XIV Remote Mirroring usageRemot
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►Metro region plus out-of-region
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Figure 4-15 shows an XIV local snap
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►XIV target configuration: synchr
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►XIV target configuration: bi-dir
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Connections must be made between po
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In Figure 4-28, five of the seven e
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If multiple volumes will have depen
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there are certain additional constr
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In synchronous mirroring, during st
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4.4.11 Mirror reactivation and resy
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►►The volume mirroring settings
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4.4.16 Deleting mirror coupling def
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10.Unmap master peers at XIV 2 from
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6. Remove connectivity between the
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4.7 Advantages of XIV mirroringXIV
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As seen in Example 4-1, in the Role
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hover the mouse over a port, as sho
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Selecting Configure opens a configu
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Connections are easily defined by c
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4.11.3 XCLI examplesXCLI commands c
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124 IBM XIV Storage System: Copy Se
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5.1 Synchronous mirroring configura
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- Slave CG / VolumeThis is the name
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2. On the Secondary XIV go to the R
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Adding a mirrored volume to a mirro
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5.3 Role reversalWith synchronous m
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uncommitted data, and it is the res
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►►The local site recoveryThe ol
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Example 5-8 List mirror couplingsFi
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5.5.3 Phase 3: recovery of the prim
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Reactivating the remote mirror coup
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5.5.4 Phase 4: switching production
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5. Reassign volumes back to the pro
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6.1 Asynchronous mirroring configur
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The slave volume must be unlocked a
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Using XCLI for volume mirroring set
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consistency group requires the volu
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Go to the Mirroring panel and verif
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-- Activate Mirror CGmirror_activat
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Change RPO and intervalThe required
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Deactivation on the masterTo deacti
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6.2 Role reversalChanging roles can
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Slave peer consistencyWhen the user
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Page 196 and 197: Figure 6-42 New master volumesAfter
Page 198 and 199: XCLI commands for DR testingFigure
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Page 208 and 209: Figure 7-3 depicts a fabric-attache
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Page 212 and 213: c. Name: Enter a cluster name in th
Page 214 and 215: Important: You cannot use the XIV d
Page 216 and 217: 7.3.4 Create and activate a data mi
Page 218 and 219: Important: If this is an online mig
Page 220 and 221: ►►►►►►►►Define host
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Page 224 and 225: - Source LUN: Enter the decimal val
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Page 230 and 231: If you chose to allow the XIV to de
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Page 244 and 245: In Example 7-10 the XCLI commands s
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Page 260 and 261: 8.1 Steps to take when using SVC mi
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Page 264 and 265: 8.3.3 Hardware dependenciesThere ar
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Page 268 and 269: 8.4.3 Creating XIV volumes that are
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Page 272 and 273: 2. Define the SVC nodes to the XIV
Page 274 and 275: 2. List the newly detected MDisks,
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In Example 8-55, we monitor the mig
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The VDisk moves from being in image
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the additional Fibre Channel ports
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TasknumberCompleted?Where toperform
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► Fibre Channel SAN Configuration
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DR testingGUI steps 179DS4000 190,
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RRDAC 227-228reactivation 111Recove
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emote mirroring peers 110remote tar
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IBM XIV Storage System: CopyService
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IBM XIV Storage System Copy Services and Migration

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