IBM XIV Storage System Copy Services and Migration

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In Example 8-55, we monitor the migration and wait for it to complete (no response meansthat it is complete). We then confirm that the MDisk shows as in image mode and the VDiskshows as image type.Example 8-55 Monitoring the migrationIBM_2145:SVCSTGDEMO:admin>svcinfo lsmigrateIBM_2145:SVCSTGDEMO:admin>IBM_2145:SVCSTGDEMO:admin>svcinfo lsmdiskid name status mode mdisk_grp_id mdisk_grp_name capacity9 mdisk9 online image 1 MGR_MDSK_GRP 16.0GBIBM_2145:SVCSTGDEMO:admin>svcinfo lsvdiskid name status mdisk_grp_id mdisk_grp_name capacity type5 migrateme online 1 MGR_MDSK_GRP 10.00GB imageWe must confirm that the VDisk is in image mode or data loss will occur in the next step. Atthis point we must take an outage.8.10.3 Outage stepAt the SVC we un-map the volume (which disrupts the host) and then remove the VDisk. Atthe host we must have unmounted the volume (or shut down the host) to ensure that any datacached at the host has been flushed to the SVC. However, at the SVC itself, if there is stillwrite data in cache for this VDisk, then you will get a not empty message. You can checkwhether this is the case by displaying the fast_write_state for the VDisk with an svcinfolsvdisk command. You must wait for the data to flush out of cache, which may take severalminutes.The commands shown in Example 8-56 apply to a host whose Host ID is 2 and the VDisk IDis 5.Example 8-56 Removing the source VDiskIBM_2145:SVCSTGDEMO:admin>svctask rmvdiskhostmap -host 2 5IBM_2145:SVCSTGDEMO:admin>svctask rmvdisk 5IBM_2145:SVCSTGDEMO:admin>svcinfo lsmdiskid name status mode mdisk_grp_id mdisk_grp_name capacity9 mdisk9 online unmanaged 16.0GBThe MDisk is now unmanaged (even though it contains customer data) and could be mappedto a different SVC cluster or simply mapped directly to a non-SVC host.8.10.4 Bring the VDisk onlineWe now create a new managed disk group with an extent size of 1024, but no MDisks. Wecould have done this earlier, but it is a very quick step. In Example 8-57 we create MDiskgroup 2.Example 8-57 Creating a new MDisk groupIBM_2145:SVCSTGDEMO:admin>svctask mkmdiskgrp -name image1024 -ext 1024MDisk Group, id [2], successfully created270 IBM XIV Storage System: Copy Services and Migration
We now use the unmanaged MDisk to create an image mode VDisk in the new MDisk groupand map it to the relevant host. Notice in Example 8-58 that the host ID is 2 and the VDisknumber changed to 10.Example 8-58 Creating the image mode VDiskIBM_2145:SVC:admin>svctask mkvdisk -mdiskgrp 2 -iogrp 0 -vtype image -mdisk 9 -name migratedVirtual Disk, id [10], successfully createdIBM_2145:SVC:admin>svctask mkvdiskhostmap -host 2 10Virtual Disk to Host map, id [2], successfully createdWe can now reboot the host (or scan for new disks) and the LUN will return with data intact.Important: The VDisk ID and VDisk names were both changed in this example. Scriptsthat use the VDisk name or ID (such as those used to automatically create flashcopies)must be changed to reflect the new name and ID.8.10.5 Migration from image mode to managed modeWe now must migrate the VDisks from image mode on individual image mode MDisks tostriped mode VDisks in a managed mode MDisk group.First we create a new managed disk group using volumes on the XIV intended to be used asthe final destination. In Example 8-59, five volumes, each 1632 GB, were created on the XIVand mapped to the SVC. These are detected as 1520 GiB (because 1632 GB on the XIV GUIequals 1520 GiB on the SVC GUI). At a certain point the MDisks must also be renamed fromthe default names given by the SVC using the svctask chmdisk -name command.Example 8-59 Listing free MDisksIBM_2145:SVCSTGDEMO:admin>svcinfo lsmdisk -filtervalue mode=unmanagedid name status mode capacity ctrl_LUN_# controller14 mdisk14 online unmanaged 1520.0GB 0000000000000007 XIV15 mdisk15 online unmanaged 1520.0GB 0000000000000008 XIV16 mdisk16 online unmanaged 1520.0GB 0000000000000009 XIV17 mdisk17 online unmanaged 1520.0GB 000000000000000A XIV18 mdisk18 online unmanaged 1520.0GB 000000000000000B XIVWe create a MDisk group using an extent size of 1024 MB with the five free MDisks. InExample 8-60 MDisk group 3 is created.Example 8-60 Creating target MDisk groupIBM_2145:SVCSTGDEMO:admin>svctask mkmdiskgrp -name XIV_Target -mdisk 14:15:16:17:18 -ext 1024MDisk Group, id [3], successfully createdWe then migrate the image mode VDisk (in our case VDisk 5) into the new MDisk group (inour case group 3), as shown in Example 8-61.Example 8-61 Migrating the VDiskIBM_2145:SVCSTGDEMO:admin>svctask migratevdisk -mdiskgrp 3 -vdisk 5Chapter 8. SVC migration with XIV 271
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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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►►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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that volume must have been deleted
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►The volume on the source non-XIV
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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 272 and 273: 2. Define the SVC nodes to the XIV
Page 274 and 275: 2. List the newly detected MDisks,
Page 276 and 277: 8.7.2 Using VDisk mirroring to move
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Page 282 and 283: In Example 8-42 we display the prog
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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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