IBM XIV Storage System Copy Services and Migration

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Slave peer consistencyWhen the user is changing the slave volume or consistency group to a master volume ormaster consistency group, they may not be in a consistent state. Therefore, the volumes areautomatically restored to the last_replicated snapshot.Changing the master peerWhen a peer role is changed from slave to master, then the mirror automatically becomesinactive because both volumes are a master (Figure 6-25 on page 167). When coupling isinactive, the master volume or consistency group can change roles. After such a change themaster volume or consistency group becomes the slave volume or consistency group(Figure 6-27).Figure 6-27 Original master becomes slaveUnsynchronized master becoming a slave volume or consistency groupWhen a master volume (or consistency group) is inactive, it is also not consistent with theprevious slave. Any changes made after the last replicated snapshot time will be lost whenthe volume (CG) becomes a slave volume (CG). The data will be restored to the lastreplicated snapshot to match the data on the peer volume, which is now the new mastervolume.Upon re-establishing the connection, the primary volume or consistency group (current slavevolume/CG) is updated from the secondary volume/CG (new master volume/CG) with datathat was written to the secondary volume after the last replicated snapshot timestamp.Reconnection when both sides have the same roleSituations where both sides are configured to the same role can only occur when one sidewas changed. The roles must be changed to have one master and one slave (volume orconsistency group). Change the volume roles as appropriate on both sides before the link isresumed.If the link is resumed and both sides have the same role, the coupling does not becomeoperational. The user must use the change role function on one of the volumes and thenactivate the mirroring.Peer reverts to last_replicated snapshot. See 6.5.4, “Mirroring special snapshots” onpage 172.168 IBM XIV Storage System: Copy Services and Migration
Using XCLI commands to change rolesFigure 6-28 shows an example of using XCLI commands to change roles.-- Slave change rolemirror_change_role cg="HS_Pool1_CG"-- Master change rolemirror_change_role cg="HS_Pool1_CG"-- Activate new Mastermirror_activate cg="HS_Pool1_CG"Figure 6-28 XCLI change roles6.3 Resynchronization after link failureWhen a link failure occurs, the primary system must start tracking changes to the mirrorsource volumes so that these changes can be copied to the secondary once recovered.When recovering from a link failure, the following steps are taken to synchronize the data:► Asynchronous mirroring sync jobs proceed as scheduled. Sync jobs are restarted and anew most_recent snapshot is taken. See 6.5.4, “Mirroring special snapshots” onpage 172.► The primary system copies the changed data to the secondary volume. Depending onhow much data must be copied, this operation could take a long time, and the statusremains RPO_Lagging.6.4 Disaster recoveryThere are two broad categories of disaster:► One that destroys the primary (local) site or destroys the data there► One that makes the primary site or the data there unavailable, but that leaves the dataintactHowever, within these broad categories there are a number of situations that may exist. Someof these and the recovery procedures are considered below:►A disaster that makes the XIV at the primary site unavailable, but leaves the site itself andthe servers there still availableIn this scenario the volumes/CG on the XIV at the secondary site can be switched tomaster volumes/CG, servers at the primary site can be redirected to the XIV at thesecondary site, and normal operations can start again. When the XIV at the primary site isrecovered the data can be mirrored from the secondary site back to the primary site. A fullinitialization of the data is usually not needed.Only changes that take place at the secondary site are transferred to the primary site. Ifdesired, a planned site switch can then take place to resume production activities at theprimary site. See 6.2, “Role reversal” on page 166, for details related to this process.Chapter 6. Asynchronous Remote Mirroring 169
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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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Page 142 and 143: 5.1 Synchronous mirroring configura
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Page 162 and 163: 5.5.4 Phase 4: switching production
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Page 170 and 171: Using XCLI for volume mirroring set
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Page 178 and 179: Change RPO and intervalThe required
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Page 182 and 183: 6.2 Role reversalChanging roles can
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Page 188 and 189: 6.5.2 Mirroring ongoing operationFo
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Page 194 and 195: GUI steps to duplicate a snapshot g
Page 196 and 197: Figure 6-42 New master volumesAfter
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Page 214 and 215: Important: You cannot use the XIV d
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Page 220 and 221: ►►►►►►►►Define host
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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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242 IBM XIV Storage System: Copy Se
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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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