IBM XIV Storage System Copy Services and Migration

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1514131211109876543210OKACID /Diag2Channel11Gb/s2 4D u a lPo rte dDriv e ChannelOK21OK2Ho s tChannelsCh 2Ch 14Gb/s1 2DC41ABDC1 2 144Gb /sCh 1Ch 2Ho s tChannels2OK12OKDu alPorte dDriv e Channel14Gb/s22Channel2ID /Dia gACOK7.1 OverviewWhatever the reason for your data migration, it is always desirable to avoid or minimizedisruption to your business applications. Whereas there are many options available formigrating data from one storage system to another, the XIV Storage System includes a datamigration feature that enables the easy movement of data from an existing storage system tothe XIV Storage System. This feature enables the production environment to continuefunctioning during the data transfer with only one brief period of downtime for your businessapplications. Figure 7-1 illustrates a high-level view of what the data migration environmentcould look like.Module 92 41 3XIV Port 4 Initiator ModeModule 8Host Server2 41 3Module 72 41 3Non-XIV Disk SystemFC416SAN SwitchModule 62 41 3Module 52 41 3Module 42 41 3XIV port 4 Initiator ModeXIV Storage SystemFigure 7-1 Data migration simple viewThe IBM XIV Data Migration solution offers a smooth data transfer, because it:► Requires only a single short outage to switch LUN ownership. This enables the immediateconnection of a host server to the XIV Storage System, providing the user with directaccess to all the data before it has been copied to the XIV Storage System.► Synchronizes data between the two storage systems using transparent copying to the XIVStorage System as a background process with minimal performance impact.► Supports data migration from practically all storage vendors.► Must be set up using Fibre Channel.► Can be used to migrate SAN boot volumes.The XIV Storage System manages the data migration by simulating host behavior. Whenconnected to the storage device containing the source data, XIV looks and behaves like aSCSI initiator, which in common terms means that it acts like a host server. After theconnection is established, the storage device containing the source data believes that it is186 IBM XIV Storage System: Copy Services and Migration
eceiving read requests from a host, when in fact it is the XIV Storage System doing ablock-by-block copy of the data, which the XIV is then writing onto an XIV volume.During the background copy process, the host server is connected to the XIV StorageSystem. The XIV Storage System handles all read and write requests from the host server,even if the data is not resident on the XIV Storage System. In other words, during the datamigration, the data transfer is transparent to the host and the data is available for immediateaccess.It is important that the connections between the two storage systems remain intact during theentire migration process. If at any time during the migration process the communicationbetween the storage systems fails, the process also fails. In addition, if communication failsafter the migration reaches synchronised status, writes from the host will fail if the sourceupdating option was chosen. The situation is further explained in the 7.2, “Handling I/Orequests” on page 187. The process of migrating data is performed at a volume level, as abackground process.The data migration facility in XIV firmware revisions 10.1 and later supports the following:► Up to four migration targets can be configured on an XIV (where a target is either onecontroller in an active/passive storage device or one active/active storage device). XIVfirmware revision 10.2 increased the number of targets to 16. The target definitions areused for both Remote Mirroring (RM) and data migration (DM). Both DM and RM functionscan be active at the same time. As already stated, an active/passive storage device withtwo controllers uses two target definitions unless only one of the controllers is used for themigration.► The XIV can communicate with host LUN IDs ranging from 0 to 512 (in decimal). Thisdoes not necessarily mean that the non-XIV disk system can provide LUN IDs in thatrange. You may be restricted by the ability of the non-XIV storage controller to use only 16or 256 LUN IDs depending on hardware vendor and device.► Up to 4000 LUNs can be concurrently migrated.Important: During the discussion in this chapter, the source system in a data migrationscenario is referred to as a target when setting up paths between the XIV Storage Systemand the donor storage (the non-XIV storage). This terminology is also used in RemoteMirroring, and both functions share the same terminology for setting up paths fortransferring data.7.2 Handling I/O requestsThe XIV Storage System handles all I/O requests for the host server during the data migrationprocess. All read requests are handled based on where the data currently resides. Forexample, if the data has already been written to the XIV Storage System, it is read from thatlocation. However, if the data has not yet been migrated to the IBM XIV storage, the readrequest comes from the host to the XIV Storage System, which in turn retrieves the data fromthe source storage device and provides it to the host server.The XIV Storage System handles all host server write requests and the non-XIV disk systemis now transparent to the host. All write requests are handled using one of two user-selectablemethods, chosen when defining the data migration. The two methods are known as sourceupdating and no source updating.Chapter 7. Data migration 187
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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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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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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
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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
Page 184 and 185: Slave peer consistencyWhen the user
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Page 188 and 189: 6.5.2 Mirroring ongoing operationFo
Page 190 and 191: The sync job runs and the mirror st
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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
Page 198 and 199: XCLI commands for DR testingFigure
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Page 204 and 205: An example of selecting which metho
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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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Page 230 and 231: If you chose to allow the XIV to de
Page 232 and 233: that volume must have been deleted
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Page 242 and 243: 7.12.3 HDS TagmaStore USPIn this se
Page 244 and 245: In Example 7-10 the XCLI commands s
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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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