IBM XIV Storage System Copy Services and Migration

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If multiple volumes will have dependent write activity, they may be put into a single storagepool in the XIV system and then added to an XIV consistency group to be managed as asingle unit for remote mirroring. Any mirroring actions are taken simultaneously against themirrored consistency group as a whole, preserving dependent write consistency. Mirroringactions cannot be taken against an individual volume pair while it is part of a mirrored CG.However, an individual volume pair may be dynamically removed from the mirroredconsistency group.XIV also supports creation of application-consistent data in the remote mirroring targetvolumes, as discussed 4.5.4, “Creating application-consistent data at both local and theremote sites” on page 109.Defining mirror coupling and peersAfter the remote mirroring targets have been defined, a coupling or mirror may be defined,creating a mirroring relationship between two peers.The two peers in the mirror coupling may be either two volumes (volume peers) or twoconsistency groups (CG peers), as shown in Figure 4-32.SITE 1 SITE 2ProductionDR Test/Recovery ServersVolume PeerDesignatedPrimaryMMMVolumeCoupling/MirrorDefinedVolumeCoupling/MirrorDefinedVolumeCoupling/MirrorDefinedSSSVolume PeerDesignatedSecondaryConsistency Group PeerPrimary Designation (P)Master Role (M)P/MCGCoupling/MirrorDefinedS/SConsistency Group PeerSecondary Designation (S)Slave Role (S)Figure 4-32 Defining mirror couplingEach of the two peers in the mirroring relationship is given a designation and a role. Thedesignation indicates the original or normal function of each of the two peers—either primaryor secondary. The peer designation does not change with operational actions or commands.(If necessary, the peer designation may be changed by explicit user command or action.)The role of a peer indicates its current (perhaps temporary) operational function (eithermaster or slave). The operational role of a peer may change as the result of user commandsor actions. Peer roles typically change during DR testing or a true disaster recovery andproduction site switch.When a mirror coupling is created, the first peer specified (for example, the volumes or CG atsite 1, as shown in Figure 4-32) is the source for data to be replicated to the target system, soit is given the primary designation and the master role.The second peer specified (or automatically created by the XIV system) when the mirroringcoupling is created is the target of data replication, so it is given the secondary designationand the slave role.96 IBM XIV Storage System: Copy Services and Migration
When a mirror coupling relationship is first created, no data movement occurs.4.4.5 Activating an XIV mirror couplingWhen an XIV mirror coupling is first activated, all actual data existing on the master is copiedto the slave. This process is referred to as initialization. XIV Remote Mirroring copies volumeidentification information (that is, physical volume ID/PVID) and any actual data on thevolumes. Space that has not been used is not copied.Initialization may take a significant amount of time if a large amount of data exists on themaster when a mirror coupling is activated. As discussed earlier, the rate for this initial copy ofdata can be specified by the user. The speed of this initial copy of data will also be affected bythe connectivity and bandwidth (number of links and link speed) between the XIV primary andsecondary systems.As an option to remove the impact of distance on initialization, XIV mirroring may be initializedwith the target system installed locally, and the target system may be disconnected afterinitialization, shipped to the remote site and reconnected, and mirroring reactivated.If a remote mirroring configuration is set up when a volume is first created (that is, before anyapplication data has been written to the volume), initialization will be very quick.When an XIV consistency group mirror coupling is created, the CG must be empty so there isno data movement and the initialization process is extremely fast.The mirror coupling status at the end of initialization differs for XIV synchronous mirroring andXIV asynchronous mirroring (see “Synchronous mirroring states” on page 80 and “Storagepools, volumes, and consistency groups” on page 92), but in either case, when initialization iscomplete, a consistent set of data exists at the remote site. See Figure 4-33.SITE 1 SITE 2ProductionDR Test/Recovery ServersVolume PeerDesignatedPrimaryMMMVolumeCoupling/MirrorActiveVolumeCoupling/MirrorActiveVolumeCoupling/MirrorActiveSSSVolume PeerDesignatedSecondaryConsistency Group PeerPrimary Designation (P)Master Role (M)P/MCGCoupling/MirrorActiveS/SConsistency Group PeerSecondary Designation (S)Slave Role (S)Figure 4-33 Active mirror coupling4.4.6 Adding volume mirror coupling to consistency group mirror couplingOnce a volume mirror coupling has completed initialization, the master volume may be addedto a mirrored consistency group in the same storage pool (note that with each mirroring typeChapter 4. Remote Mirroring 97
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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
Page 62 and 63: ►For exchange data, the Microsoft
Page 64 and 65: 2.4.1 XIV VSS Provider installation
Page 66 and 67: Provide specific information regard
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 114 and 115: there are certain additional constr
Page 116 and 117: In synchronous mirroring, during st
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
Page 152 and 153: uncommitted data, and it is the res
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
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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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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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