IBM XIV Storage System Copy Services and Migration

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In synchronous mirroring, during standby mode, XIV metadata is used to note which parts ofa master volume have changed but have not yet been replicated to the slave volume(because mirroring is not currently active). The actual changed data is not retained in cache,so there is no danger of exhausting cache while mirroring is in standby mode.When synchronous mirroring is reactivated by a user command or communication is restored,the metadata is used to resynchronize changes from the master volumes to the slavevolumes. XIV mirroring records changes for master volumes only. If it is desirable to recordchanges to both peer volumes while mirroring is in standby mode, the slave volume must bechanged to a master volume.Note that in asynchronous mirroring, metadata is not used and the comparison between themost_recent and last_replicated snapshots indicates the data that must be replicated.Planned deactivation of XIV remote mirroring may be done to suspend remote mirroringduring a planned network outage or DR test, or to reduce bandwidth during a period of peakload.4.4.9 Changing role of slave volume or CGWhen XIV mirroring is active, the slave volume or CG is locked and write access is prohibited.To allow write access to a slave peer, in case of failure or unavailability of the master, theslave volume role must be changed to the master role. Refer to Figure 4-37.SITE 1 SITE 2Production ServersDR Test/Recovery ServersVolume PeerDesignated PrimaryMaster RoleMVolumeCoupling/MirrorStandbyMVolume PeerDesignated SecondaryMaster RoleCG PeerDesignated PrimaryMaster RoleMCGCoupling/MirrorStandbyMCG PeerDesignated SecondaryMaster RoleFigure 4-37 Changing role of slave volume or CGChanging the role of a volume from slave to master allows the volume to be accessed. Insynchronous mirroring, changing the role also starts metadata recording for any changesmade to the volume. This metadata may be used for resynchronization (if the new mastervolume remains the master when remote mirroring is reactivated). In asynchronous mirroring,changing a peer's role automatically reverts the peer to its last_replicated snapshot.When mirroring is in standby mode, both volumes may have the master role, as shown in thefollowing section. When changing roles, both peer roles must be changed if possible (theexception being a site disaster or complete system failure). Changing the role of a slavevolume or CG is typical during a true disaster recovery and production site switch.100 IBM XIV Storage System: Copy Services and Migration
4.4.10 Changing role of master volume or CGDuring a true disaster recovery, to resume production at the remote site a slave must have itsrole changed to the master role.In synchronous mirroring, changing a peer role from master to slave allows the slave toaccept mirrored data from the master and cause deletion of metadata that was used to recordany changes while the peer had the master role.In asynchronous mirroring, changing a peer's role automatically reverts the peer to itslast_replicated snapshot. If at any point in time the command is run on the slave (changingthe slave to a master), the former master must first be changed to the slave role (uponrecovery of the primary site) before changing the secondary role back from master to slave.Both peers may temporarily have the master role when a failure at site 1 has resulted in a truedisaster recovery production site switch from site 1 to site 2. When site 1 becomes availableagain and there is a requirement to switch production back to site 1, the production changesmade to the volumes at site 2 must be resynchronized to the volumes at site 1. In order to dothis, the peers at site 1 must change their role from master to slave, as shown in Figure 4-38.SITE 1 SITE 2Production ServersDR Test/Recovery ServersVolume PeerDesignated PrimarySlave RoleSVolumeCoupling/MirrorStandbyMVolume PeerDesignated SecondaryMaster RoleCG PeerDesignated PrimarySlave RoleSCGCoupling/MirrorStandbyMCG PeerDesignated SecondaryMaster RoleFigure 4-38 Changing role to slave volume and CGChapter 4. Remote Mirroring 101
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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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Page 68 and 69: The Windows server is now ready to
Page 70 and 71: 3. The Requirements Check dialog wi
Page 72 and 73: 5. The completion window shown in F
Page 74 and 75: To perform a VSS snapshot backup of
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Page 78 and 79: To see a list of the available VSS
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Page 82 and 83: 3.1 Volume copy architectureThe vol
Page 84 and 85: Figure 3-2 provides an example of t
Page 86 and 87: After the copy is complete, power u
Page 88 and 89: 4.1 XIV Remote Mirroring overviewTh
Page 90 and 91: ►Host read operations are perform
Page 92 and 93: Figure 4-4 shows remote mirror conn
Page 94 and 95: 4.2.2 Operational proceduresMirrori
Page 96 and 97: After mirroring has been implemente
Page 98 and 99: 4.3 XIV Remote Mirroring usageRemot
Page 100 and 101: ►Metro region plus out-of-region
Page 102 and 103: Figure 4-15 shows an XIV local snap
Page 104 and 105: ►XIV target configuration: synchr
Page 106 and 107: ►XIV target configuration: bi-dir
Page 108 and 109: Connections must be made between po
Page 110 and 111: In Figure 4-28, five of the seven e
Page 112 and 113: If multiple volumes will have depen
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Page 118 and 119: 4.4.11 Mirror reactivation and resy
Page 120 and 121: ►►The volume mirroring settings
Page 122 and 123: 4.4.16 Deleting mirror coupling def
Page 124 and 125: 10.Unmap master peers at XIV 2 from
Page 126 and 127: 6. Remove connectivity between the
Page 128 and 129: 4.7 Advantages of XIV mirroringXIV
Page 130 and 131: As seen in Example 4-1, in the Role
Page 132 and 133: hover the mouse over a port, as sho
Page 134 and 135: Selecting Configure opens a configu
Page 136 and 137: Connections are easily defined by c
Page 138 and 139: 4.11.3 XCLI examplesXCLI commands c
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Page 142 and 143: 5.1 Synchronous mirroring configura
Page 144 and 145: - Slave CG / VolumeThis is the name
Page 146 and 147: 2. On the Secondary XIV go to the R
Page 148 and 149: Adding a mirrored volume to a mirro
Page 150 and 151: 5.3 Role reversalWith synchronous m
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Page 154 and 155: ►►The local site recoveryThe ol
Page 156 and 157: Example 5-8 List mirror couplingsFi
Page 158 and 159: 5.5.3 Phase 3: recovery of the prim
Page 160 and 161: Reactivating the remote mirror coup
Page 162 and 163: 5.5.4 Phase 4: switching production
Page 164 and 165: 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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184 IBM XIV Storage System: Copy Se
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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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7.10.4 Back-out after a data migrat
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TasknumberCompleted?Where toperform
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Using Microsoft calculator to conve
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7.12.3 HDS TagmaStore USPIn this se
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In Example 7-10 the XCLI commands s
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1011 0003 10.0 5001738000230153 Nex
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Using XIV DM to migrate an AIX file
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zone: nextrazap_dolly_fcs110:00:00:
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We now allocate the ESS 800 LUNS to
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We can also use a script provided b
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We then get a warning message. The
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8.1 Steps to take when using SVC mi
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When a partially populated XIV has
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8.3.3 Hardware dependenciesThere ar
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This leads to the following recomme
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8.4.3 Creating XIV volumes that are
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If your SVC uses firmware Version 5
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2. Define the SVC nodes to the XIV
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2. List the newly detected MDisks,
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8.7.2 Using VDisk mirroring to move
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8.8.2 Create the MDisk groupWe must
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8.9.2 Create the MDisk groupWe must
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In Example 8-42 we display the prog
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When an SVC volume is created we no
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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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