IBM XIV Storage System Copy Services and Migration

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If you know in advance that an automatic deletion is possible, a pool can be expanded toaccommodate additional snapshots. This function requires that there is available space onthe system for the storage pool. See Figure 1-5.Snapshot space on a single diskSnapshot free partitionSnapshot 2Snapshot 1Utilization before anew allocationSnapshot 3Snapshot 3Snapshot 2Snapshot 1Snapshot 3Snapshot 2Snapshot free partitionSnapshot 3 allocatesa partition andSnapshot 1 isdeleted, becausethere must alwaysbe at least one freepartition for anysubsequent snapshot.Figure 1-5 Diagram of automatic snapshot deletionEach snapshot has a deletion priority property that is set by the user. There are four priorities,with 1 being the highest priority and 4 being the lowest priority. The system uses this priorityto determine which snapshot to delete first. The lowest priority becomes the first candidate fordeletion. If there are multiple snapshots with the same deletion priority, the XIV systemdeletes the snapshot that was created first. Refer to 1.2.3, “Deletion priority” on page 12 foran example of working with deletion priorities.A snapshot also has a unique ability to be unlocked. By default, a snapshot is locked oncreation and is only readable. Unlocking a snapshot allows the user to modify the data in thesnapshot for post-processing.When unlocked, the snapshot takes on the properties of a volume and can be resized ormodified. As soon as the snapshot has been unlocked, the modified property is set. Themodified property cannot be reset after a snapshot is unlocked, even if the snapshot isrelocked without modification.In certain cases, it might be important to duplicate a snapshot. When duplicating a snapshot,the duplicate snapshot points to the original data and has the same creation date as theoriginal snapshot, if the first snapshot has not been unlocked. This feature can be beneficialwhen the user wants to have one copy for a backup and another copy for testing purposes.If the first snapshot is unlocked and the duplicate snapshot already exists, the creation timefor the duplicate snapshot does not change. The duplicate snapshot points to the originalsnapshot. If a duplicate snapshot is created from the unlocked snapshot, the creation date isthe time of duplication and the duplicate snapshot points at the original snapshot.6 IBM XIV Storage System: Copy Services and Migration
For the further discussion we must introduce two other terms, pools and consistency groups(Figure 1-6).Terminology• Storage Pool– Administrative constructfor controlling usage ofdata capacity• Volume– Data capacity spreadsacross all disks in IBMXIV system• Snapshot– Point in time image– Same storage pool assource• Consistency group– Multiple volumes thatrequire consistentsnapshot creation– All in same storage pool• Snapshot group– Group of consistentsnapshotsStorage PoolConsistency GroupVolumeVolumeSnapshot SnapshotSnapshot GroupFigure 1-6 XIV terminologyA storage pool is just a logical entity that represents storage capacity. Volumes are created ina storage pool and snapshots of a volume are within the same storage pool. Becausesnapshots require capacity as the source and the snapshot volume differ over time, space forsnapshots must be set aside when defining a storage pool (Figure 1-7). A storage pool canbe resized as needed as long as there is enough free capacity in the XIV Storage System.Figure 1-7 Creating a storage pool with capacity for snapshotsChapter 1. Snapshots 7
Page 1: Front coverIBM XIV Storage System:C
Page 4: Note: Before using this information
Page 8 and 9: 7.9.4 Host server cannot access the
Page 10 and 11: viiiIBM XIV Storage System: Copy Se
Page 12 and 13: TrademarksIBM, the IBM logo, and ib
Page 14 and 15: Recovery Program at the Pentagon fo
Page 16 and 17: Comments welcomeYour comments are i
Page 18 and 19: 1.1 Snapshots architectureBefore we
Page 20 and 21: A logical volume is represented by
Page 24 and 25: An application can utilize many vol
Page 26 and 27: Note: The creation date of the dupl
Page 28 and 29: Along with these properties, the tr
Page 30 and 31: The GUI also lets you specify the d
Page 32 and 33: pointers to the original data are l
Page 34 and 35: For the second scenario, the origin
Page 36 and 37: Figure 1-28 no longer displays the
Page 38 and 39: To examine the details of the scena
Page 40 and 41: Restriction: Volumes in a consisten
Page 42 and 43: When created, the consistency group
Page 44 and 45: The new snapshots are created and d
Page 46 and 47: To obtain details about a consisten
Page 48 and 49: Example 1-12 illustrates the snap_g
Page 50 and 51: 1.5 MySQL database backup exampleMy
Page 52 and 53: Before running the backup script, a
Page 54 and 55: # XCLI command to perform the backu
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Page 58 and 59: 2.1 OverviewThis section includes a
Page 60 and 61: 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
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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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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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