IBM XIV Storage System Copy Services and Migration

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– Source LUN: Enter the decimal value of the LUN as presented to the XIV from thenon-XIV storage system. Certain storage devices present the LUN ID as hex. Thenumber in this field must be the decimal equivalent.– Keep Source Updated: Check this if the non-XIV storage system source volume is tobe updated with writes from the host. In this manner all writes from the host will bewritten to the XIV volume, as well as the non-XIV source volume until the datamigration object is deleted.Click Define.3. Test the data migration object. Right-click to select the created data migration volume andchoose Test Data Migration. If there are any issues with the data migration object the testfails reporting the issue that was found. See Figure 7-11 on page 199 for an example ofthe panel.If the volume that you created is too small or too large you will receive an error message whenyou do a test data migration, as shown in Figure 7-16. If you try and activate the migration youwill get the same error message. You must delete the volume that you manually created onthe XIV and create a new correctly sized one. This is because you cannot resize a volumethat is in a data migration pair, and you cannot delete a data migration pair unless it hascompleted the background copy. Delete the volume and then investigate why your sizecalculation was wrong. Then create a new volume and a new migration and test it again.Figure 7-16 XIV volume wrong size for migration7.6 Changing and monitoring the progress of a migrationIt is possible to speed up or slow down the migration process, as well as monitor its rate.208 IBM XIV Storage System: Copy Services and Migration
7.6.1 Changing the synchronization rateThere is only one tunable parameter that determines the speed at which migration data istransferred between the XIV and defined targets. There are two other tunable parameters thatapply to XIV Remote Mirroring (RM):► max_initialization_rateThe rate (in MBps) at which data is transferred between the XIV and defined targets. Thedefault rate is 100 MBps and can be configured on a per-target basis. In other words, onetarget can be set to 100 MBps while another is set to 50 MBps. In this example a total of150 MBps (100+50) transfer rate is possible. If the transfer rate that you are seeing islower than the initialization rate, this may indicate that you are exceeding the capabilities ofthe non-XIV disk system to operate at that rate. If the migration is not being done withattached hosts off-line, consider dropping the initialization rate to a very low numberinitially to ensure that there that the volume of migration I/O does not interfere with otherhosts using the non-XIV disk system. Then slowly increase the number while checking toensure that response times are not affected on other attached hosts. If you set themax_initialization_rate to zero, then you will stop the background copy, but hosts will stillbe able to access all activated migration volumes.► max_syncjob_rateThis parameter (which is in MBps) is used in XIV remote mirroring for synchronizingmirrored snapshots. It is not normally relevant to data migrations. However, themax_initialization_rate cannot be greater than the max_syncjob_rate, which in turn cannotbe greater than the max_resync_rate. In general, there is no reason to ever increase thisrate.► max_resync_rateThis parameter (which is in MBps) is again used for XIV remote mirroring only. It is notnormally relevant to data migrations. This parameter defines the resync rate for mirroredpairs. Once remotely mirrored volumes are synchronized, a resync is required if thereplication is stopped for any reason. It is this resync where only the changes are sentacross the link that this parameter affects. The default rate is 300 MBps. There is nominimum or maximum rate. However, setting the value to 400 or more in a 4 Gbpsenvironment does not show any increase in throughput. In general, there is no reason toever increase this rate.Increasing the max_initialization_rate parameter may decrease the time required to migratethe data. However, doing so may impact existing production servers on the non-XIV storagedevice. By increasing the rate parameters, more outgoing disk resources will be used to servemigrations and less for existing production I/O. Be aware of how these parameters affectmigrations as well as production. You could always choose to only set this to a higher valueduring off-peak production periods.Chapter 7. Data migration 209
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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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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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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
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
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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 208 and 209: Figure 7-3 depicts a fabric-attache
Page 210 and 211: 4. Enter another port (repeating st
Page 212 and 213: c. Name: Enter a cluster name in th
Page 214 and 215: Important: You cannot use the XIV d
Page 216 and 217: 7.3.4 Create and activate a data mi
Page 218 and 219: Important: If this is an online mig
Page 220 and 221: ►►►►►►►►Define host
Page 222 and 223: 4. Click New for a new system varia
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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 236 and 237: 7.10.4 Back-out after a data migrat
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Page 244 and 245: In Example 7-10 the XCLI commands s
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Page 260 and 261: 8.1 Steps to take when using SVC mi
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Page 264 and 265: 8.3.3 Hardware dependenciesThere ar
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Page 268 and 269: 8.4.3 Creating XIV volumes that are
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Page 272 and 273: 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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