IBM XIV Storage System Copy Services and Migration

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►For exchange data, the Microsoft Exchange Server contains the writer components andrequires no configuration.For SQL data, Microsoft SQL Server contains the writer components (SqlServerWriter). Itis installed with the SQL Server software and requires the following minor configurationtasks:– Set the SqlServerWriter service to automatic. This enables the service to startautomatically when the machine is rebooted.– Start the SqlServerWriter service.ProviderThis is the application that produces the shadow copy and also manages its availability. Itcan be a system provider (such as the one included with the Microsoft Windows operatingsystem), a software provider, or a hardware provider (such as the one available with theXIV storage system).For XIV, you must install and configure the IBM XIV VSS Provider.VSS uses the following terminology to characterize the nature of volumes participating in ashadow copy operation:► PersistentThis is a shadow copy that remains after the backup application completes its operations.This type of shadow copy also survives system reboots.► Non-persistentThis is a temporary shadow copy that remains only as long as the backup applicationneeds it in order to copy the data to its backup repository.► TransportableThis is a shadow copy volume that is accessible from a secondary host so that the backupcan be off-loaded. Transportable is a feature of hardware snapshot providers. On an XIVyou can mount a snapshot volume to another host.► Source volumeThis is the volume that contains the data to be shadow copied. These volumes contain theapplication data.► Target or snapshot volumeThis is the volume that retains the shadow-copied storage files. It is an exact copy of thesource volume at the time of backup.VSS supports the following shadow copy methods:► Clone (full copy/split mirror)A clone is a shadow copy volume that is a full copy of the original data as it resides on avolume. The source volume continues to take application changes while the shadow copyvolume remains an exact read-only copy of the original data at the point-in-time that it wascreated.► Copy-on-write (differential copy)A copy-on-write shadow copy volume is a differential copy (rather than a full copy) of theoriginal data as it resides on a volume. This method makes a copy of the original databefore it is overwritten with new changes. Using the modified blocks and the unchangedblocks in the original volume, a shadow copy can be logically constructed that representsthe shadow copy at the point-in-time at which it was created.46 IBM XIV Storage System: Copy Services and Migration
►Redirect-on-write (differential copy)A redirect-on-write shadow copy volume is a differential copy (rather than a full copy) ofthe original data as it resides on a volume. This method is similar to copy-on-write, withoutthe double-write penalty, and it offers storage space and performance efficient snapshots.New writes to the original volume are redirected to another location set aside for snapshot.The advantage of redirecting the write is that only one write takes place, whereas withcopy-on-write, two writes occur (one to copy original data onto the storage space, theother to copy changed data). The XIV storage system supports redirect-on-write.2.3.2 Microsoft Volume Shadow Copy Service functionMicrosoft VSS accomplishes the fast backup process when a backup application (therequestor, which is Tivoli Storage FlashCopy Manager in our case) initiates a shadow copybackup. The VSS service coordinates with the VSS-aware writers to briefly hold writes ondatabases, applications, or both. VSS flushes the file system buffers and asks a provider(such as the XIV provider) to initiate a snapshot of the data. When the snapshot is logicallycompleted, VSS allows writes to resume and notifies the requestor that the backup hascompleted successfully. The (backup) volumes are mounted, but hidden and read-only, readyto be used when a rapid restore is requested. Alternatively, the volumes can be mounted to adifferent host and used for application testing or backup to tape.The Microsoft VSS FlashCopy process is:1. The requestor notifies VSS to prepare for a shadow copy creation.2. VSS notifies the application-specific writer to prepare its data for making a shadow copy.3. The writer prepares the data for that application by completing all open transactions,flushing cache and buffers, and writing in-memory data to disk.4. When the application data is ready for shadow copy, the writer notifies VSS, which in turnrelays the message to the requestor to initiate the commit copy phase.5. VSS temporarily quiesces application I/O write requests for a few seconds and the VSShardware provider performs the snapshot on the storage system.6. Once the storage snapshot has completed, VSS releases the quiesce, and database orapplication writes resume.7. VSS queries the writers to confirm that write I/Os were successfully held during theVolume Shadow Copy.2.4 XIV VSS providerA VSS hardware provider, such as the XIV VSS Provider, is used by third-party software toact as an interface between the hardware (storage system) and the operating system. Thethird-party application (which can be IBM Tivoli Storage FlashCopy Manager) uses XIV VSSProvider to instruct the XIV storage system to perform a snapshot of a volume attached to thehost system.Chapter 2. Tivoli Storage FlashCopy Manager and Volume Shadow Copy Services 47
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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
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 22 and 23: If you know in advance that an auto
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
Page 56 and 57: 40 IBM XIV Storage System: Copy Ser
Page 58 and 59: 2.1 OverviewThis section includes a
Page 60 and 61: Figure 2-2 shows the Tivoli Storage
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
Page 76 and 77: CLUSTERnodePASSWORDAccessNOGenerate
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
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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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