IBM XIV Storage System Copy Services and Migration

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In Example 8-42 we display the progress of all out-of-sync mirrors. If a mirror has reached100% it is not listed unless we specify that particular VDisk.Example 8-42 Displaying all VDisk mirrorsIBM_2145:SVCCLUSTER_DC1:admin>svcinfo lsvdisksyncprogressvdisk_id vdisk_name copy_id progress estimated_completion_time21 arielle_8 1 42 09110519365624 mitchell_17 1 83 09110518543232 sharon_1 1 3 091106083130If copying is going too slowly, you could choose set a higher syncrate when you create thecopy.You can also increase the syncrate from the default value of 50 (which equals 2 MBps) to 100(which equals 64 MBps). This change affects the VDisk itself and isvalid for any future copies.Example 8-43 shows the syntax.Example 8-43 Changing the VDisk sync rateIBM_2145:SVCSTGDEMO:admin>svctask chvdisk -syncrate 100 5Once the estimated completion time passes, we can confirm that the copy process iscomplete for VDisk 5. In Example 8-44 the sync is complete.Example 8-44 VDisk sync completedIBM_2145:SVCSTGDEMO:admin>svcinfo lsvdisksyncprogress 5vdisk_id vdisk_name copy_id progress estimated_completion_time5 migrateme 0 1005 migrateme 1 1008.9.5 Validating a VDisk copyIf you want to confirm that the data between the two VDisk copies is the same, you can run avalidate. This compares the two copies. The command itself completes immediately, but thevalidate runs in the background. In Example 8-45 a validate against VDisk 5 is started andthen monitored until it is complete. This validation step is not mandatory and is normally onlyneeded if an event occurred that makes you doubt the validity of the mirror. It is documentedhere in case you want to add an extra layer of certainty to your change.Example 8-45 Validating a VDisk mirrorIBM_2145:SVCSTGDEMO:admin>svctask repairvdiskcopy -validate 5IBM_2145:SVCSTGDEMO:admin>svcinfo lsrepairvdiskcopyprogress 5vdisk_id vdisk_name copy_id task progress est_completion5 migrateme 0 validate 57 0911031559275 migrateme 1 validate 57 091103155927IBM_2145:SVCSTGDEMO:admin>svcinfo lsrepairvdiskcopyprogress 5vdisk_id vdisk_name copy_id task progress est_completion5 migrateme 05 migrateme 1266 IBM XIV Storage System: Copy Services and Migration
8.9.6 Removing the VDisk copyNow that the sync is complete, we can remove copy 0 from the VDisk so that the VDiskcontinues to use only copy 1 (which should be on the XIV). We have two methods ofachieving this. We can either split the copies or we can just remove one copy.Removing a VDisk copyIn Example 8-46, we remove copy 0 from VDisk 5. This effectively discards the VDisk copy onthe source MDisk group. This is simple and quick but has one disadvantage, which is that youmust mirror the data back if you decide to back out the change.Example 8-46 Removing VDisk copyIBM_2145:SVCSTGDEMO:admin>svctask rmvdiskcopy -copy 0 5Splitting the VDisk copiesIn Example 8-47 we split the VDisk copies, moving copy 0 (which is on the source MDiskgroup) to become a new unmapped VDisk. This means that copy 1 (which is on the target XIVMDisk group) continues to be accessed by the host as VDisk 5. The advantage of doing thisis that the original VDisk copy remains available if we decide to back out (although it may nolonger be in sync once we split the copies). An additional step is needed to discreetly deletethe new VDisk that was created when we performed the split.Example 8-47 Splitting the VDisk copiesIBM_2145:SVCSTGDEMO:admin>svctask splitvdiskcopy -copy 0 -name mgrate_old 5Virtual Disk, id [6], successfully createdImportant: Scripts that use VDisk names or IDs should not be affected by the use of VDiskmirroring, as the VDisk names and IDs do not change. However, if you choose to split theVDisk copies and continue to use copy 0, it will be a totally new VDisk with a new nameand a new ID.8.10 Using SVC migration with image modeThis process converts VDisks on non-XIV storage to image mode MDisks on the XIV that canthen be reassigned to a different SVC or released from the SVC altogether. Because of thisextra step, the XIV requires sufficient space to hold both transitional volumes (for image modeMDisks) and the final destination volumes (for managed mode MDisks).8.10.1 Create image mode destination volumes on the XIVOn the XIV we must create one new volume for each SVC VDisk that we are migrating (whichmust be the same size as the source VDisk, or larger). These are to allow transition of theVDisk to image mode. To do this, we must determine the size of the VDisk so that we cancreate a matching XIV volume.Chapter 8. SVC migration with XIV 267
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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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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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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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►►A disaster that makes the who
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6.5.2 Mirroring ongoing operationFo
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The sync job runs and the mirror st
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Mirror synchronization statusSynchr
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GUI steps to duplicate a snapshot g
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Figure 6-42 New master volumesAfter
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XCLI commands for DR testingFigure
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1514131211109876543210OKACID /Diag2
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An example of selecting which metho
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not presented to the XIV. Check you
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Figure 7-3 depicts a fabric-attache
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4. Enter another port (repeating st
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c. Name: Enter a cluster name in th
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Important: You cannot use the XIV d
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7.3.4 Create and activate a data mi
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Important: If this is an online mig
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►►►►►►►►Define host
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4. Click New for a new system varia
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- Source LUN: Enter the decimal val
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The rate parameters can only be set
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eing generated by the migration pro
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If you chose to allow the XIV to de
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Page 260 and 261: 8.1 Steps to take when using SVC mi
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Page 298 and 299: RRDAC 227-228reactivation 111Recove
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IBM XIV Storage System Copy Services and Migration

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