IBM XIV Storage System Copy Services and Migration

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A logical volume is represented by pointers to partitions that make up the volume. If asnapshot is taken of a volume, the pointers are just copied to form the snapshot volume, asshown in Figure 1-3. No space is consumed for the snapshot volume up to now.Vol• Logical volume and itspartitions: Partitionsare spread across alldisk drives andactually each partitionexists two times (notshown here)• A snapshot of avolume is taken.Pointers point to thesame partitions as theoriginal volumeVolsnap• There is an update ofa data partition of theoriginal volume. Theupdated partition iswritten to a newlocation.VolsnapFigure 1-3 XIV architecture: snapshotsWhen an update is performed on the original data, the update is stored in a new position anda pointer of the original volume now points to the new partition, whereas the snapshot volumestill points to the old partition. Now we use up more space for the original volume and itssnapshot and it has the size of a partition (1 MB). This method is called redirect-on-write.4 IBM XIV Storage System: Copy Services and Migration
It is important to note that data on a volume comprises two fundamental building blocks.Metadata is information about how the data is stored on the physical volume and the dataitself in the blocks. Metadata management is the key to rapid snapshot performance. Asnapshot points to the partitions of its master volume for all unchanged partitions. When thedata is modified, a new partition is allocated for the modified data. In other words, the XIVStorage System manages a set of pointers based on the volume and the snapshot. Thosepointers are modified when changes are made to the user data. Managing pointers to dataenables XIV to instantly create snapshots, as opposed to physically copying the data into anew partition. Refer to Figure 1-4.Snapshot Pointerto PartitionData layout before modificationEmptyEmptyVolume AHost modifies data in Volume AVolume Pointerto PartitionSnapshot Pointerto PartitionEmptyVolume ASnapshot of AVolume Pointerto PartitionFigure 1-4 Example of a redirect-on-write operationThe actual metadata overhead for a snapshot is small. When the snapshot is created, thesystem does not require new pointers because the volume and snapshot are exactly thesame, which means that the time to create the snapshot is independent of the size or numberof snapshots present in the system. As data is modified, new metadata is created to track thechanges to the data.Note: The XIV system minimizes the impact to the host for write operations by performinga redirect-on-write operation. As the host writes data to a volume with a snapshotrelationship, the incoming information is placed into a newly allocated partition. Then thepointer to the data for the master volume is modified to point at the new partition. Thesnapshot volume continues to point at the original data partition.Because the XIV Storage System tracks the snapshot changes on a partition basis, data isonly copied when a transfer is less than the size of a partition. For example, a host writes4 KB of data to a volume with a snapshot relationship. The 4 KB is written to a new partition,but in order for the partition to be complete, the remaining data must be copied from theoriginal partition to the newly allocated partition.The alternative to redirect-on-write is the copy on write function. Most other systems do notmove the location of the volume data. Instead, when the disk subsystem receives a change, itcopies the volume’s data to a new location for the point-in-time copy. When the copy iscomplete, the disk system commits the newly modified data. Therefore, each individualmodification takes longer to complete, as the entire block must be copied before the changecan be made.As the storage assigned to the snapshot is completely utilized, the XIV Storage Systemimplements a deletion mechanism to protect itself from overutilizing the set pool space.Deletion of snapshots is further explained in 1.2.8, “Deleting a snapshot” on page 19.Chapter 1. Snapshots 5
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 22 and 23: If you know in advance that an auto
Page 24 and 25: An application can utilize many vol
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Page 28 and 29: Along with these properties, the tr
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Page 32 and 33: pointers to the original data are l
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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
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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
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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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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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