IBM XIV Storage System Copy Services and Migration

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5.3 Role reversalWith synchronous mirroring, roles can be modified by either switching or changing.Switching roles must be initiated on the master volume or consistency group when remotemirroring is operational. As the task name implies, it switches the master role to the slave roleand at the same time the slave role to the master role.Changing roles can be performed at any time (when a pair is active or inactive) for the slave,and for the master when the coupling is inactive. A change role reverts only the role of thatpeer.5.3.1 Switching rolesSwitching roles exchanges the roles of master and slave volumes or CGs. It can beperformed after the remote mirroring function is in operation and the pair is synchronized.After switching roles, the master volume or CG becomes the slave volume or CG and viceversa. There are two typical reasons for switching roles. These are:► Drills/DR testsDrills can be performed to test the functioning of the secondary site. In a drill, anadministrator simulates a disaster and tests that all procedures are operating smoothlyand that documentation is accurate.► Scheduled maintenanceTo perform maintenance at the primary site, operations can be switched to the secondarysite some time before the maintenance. This switchover cannot be performed if the masterand slave volumes or CG are not synchronized/consistent.Normally, switching the roles requires shutting down the servers at the primary site first,changing SAN zoning and XIV LUN masking to allow access to the secondary site volumes,and then restarting the servers with access to the secondary (remote) XIV. However, incertain clustered environments this takeover could be automated.5.3.2 Change roleIn a disaster at the primary site, a role change at the secondary site is the normal recoveryaction.Assuming that the primary site is down and the secondary site will become the mainproduction site, changing roles is performed at the remote (now production) site first. Later,when the primary site is up again and communication is reestablished you also change therole at the primary site to a slave to be able to establish remote mirroring from the secondarysite back to the normal production (primary) site.134 IBM XIV Storage System: Copy Services and Migration
Changing the slave peer roleThe role of the slave volume or consistency group can be changed to the master role, asshown in Figure 5-11. After this changeover, the following is true:►►►The slave volume or consistency group is now the master.The coupling has the status of unsynchronized.The coupling remains inactive, meaning that the remote mirroring is deactivated. Thisensures an orderly activation when the role of the peer on the other site is changed.Figure 5-11 Change role of a slave consistency groupThe new master volume or consistency group (at the secondary site) starts to accept writecommands from local hosts. Because coupling is not active, in the same way as for anymaster volume, metadata maintain a record of which write operations must be sent to theslave volume when communication resumes.After changing the slave to the master, an administrator must change the original master tothe slave role before communication resumes. If both peers are left with the same role(master), mirroring cannot be restarted.Slave peer consistencyWhen the user is changing the slave volume or consistency group to a master volume ormaster consistency group and a snapshot of the last consistent state exists that wasproduced during the process of resynchronizing (as a result of a broken link, for instance), thesystem reverts the slave to the last consistent snapshot.Changing the master peer roleWhen coupling is inactive, the master volume or consistency group can change roles. Aftersuch a change the master volume or consistency group becomes the slave volume orconsistency group.Unsynchronized master becoming a slave volume or consistency groupWhen a master volume (or consistency group) is inactive, it is also in an unsynchronizedstate, and it might have a backlog of uncommitted data. The uncommitted changes willpotentially be lost when the volume (CG) becomes a slave volume (CG), as this data must bereverted to match the data on the peer volume, which is now the new master volume. In thiscase, an event is created, summarizing the size of the changes that were lost. Theuncommitted data has now switched its semantics, and instead of representing updates thatthe primary peer (former master, now slave) needs to update on the secondary peer (oldslave, new master), metadata now represents updates that must be replicated from thesecondary to the primary.Upon re-establishing the connection, the primary volume or consistency group (current slavevolume/CG) updates the secondary volume/CG (new master volume/CG) with thisChapter 5. Synchronous Remote Mirroring 135
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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
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 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
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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 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
Page 162 and 163: 5.5.4 Phase 4: switching production
Page 164 and 165: 5. Reassign volumes back to the pro
Page 166 and 167: 6.1 Asynchronous mirroring configur
Page 168 and 169: The slave volume must be unlocked a
Page 170 and 171: Using XCLI for volume mirroring set
Page 172 and 173: consistency group requires the volu
Page 174 and 175: Go to the Mirroring panel and verif
Page 176 and 177: -- Activate Mirror CGmirror_activat
Page 178 and 179: Change RPO and intervalThe required
Page 180 and 181: Deactivation on the masterTo deacti
Page 182 and 183: 6.2 Role reversalChanging roles can
Page 184 and 185: Slave peer consistencyWhen the user
Page 186 and 187: ►►A disaster that makes the who
Page 188 and 189: 6.5.2 Mirroring ongoing operationFo
Page 190 and 191: The sync job runs and the mirror st
Page 192 and 193: Mirror synchronization statusSynchr
Page 194 and 195: GUI steps to duplicate a snapshot g
Page 196 and 197: Figure 6-42 New master volumesAfter
Page 198 and 199: 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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