IBM XIV Storage System Copy Services and Migration

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This leads to the following recommended volume sizes and quantities for 2-node and 4-nodeSVC clusters.Table 8-3 XIV volume size and quantity recommendationModulesTotal usablecapacity(TB)XIVhostportsVolumesize(GB)VolumequantityRatio ofvolumesto XIV hostportsApproximateleftover space(TB)6 27.26 4 1632 16 4 1.149 43.09 8 1632 26 3.3 0.6510 50.29 8 1632 30 3.7 1.3211 54.65 10 1632 33 3.3 0.7912 61.74 10 1632 37 3.7 1.3513 66.16 12 1632 40 3.3 0.8714 73.24 12 1632 44 3.7 1.4215 79.11 12 1632 48 4.0 0.76If you have a 6-node or 8-node cluster, the formula suggests that you must use much largerXIV volumes. However, currently available SVC firmware does not support an MDisk largerthan 2 TB, so it is simpler to continue to use the 1632 GB volume size. When using 1632 GBvolumes, there is leftover space. That space could be used for testing or for non-SVCdirect-attach hosts. If you map the remaining space to the SVC as an odd sized volume thenVDisk striping is not balanced, meaning that I/O is not be evenly striped across all XIV hostports.Tip: If you only provision part of the usable space of the XIV to be allocated to the SVC,then the calculations above no longer work. You should instead size your MDisks to ensurethat at least two (and up to four) MDisks are created for each host port on the XIV.8.4.2 XIV volume sizesAll volume sizes shown on the XIV GUI use decimal counting (10 9 ), meaning that 1 GB =1,000,000,000 bytes. However, a GB using binary counting (using 2 30 bytes, more accuratelyreferred to as a GiB) counts 1 GiB as 1,073,741,824 bytes (ideally called a GiB to differentiateit from a GB where size is calculated using decimal counting).►►By default the SVC uses MiB and GiB (binary counting method) when displaying MDiskand VDisk sizes. However, the SVC still uses the term MB in the SVC GUI and MB or GBin the SVC CLI output when displaying volume and disk sizes (the SVC CLI displayscapacity in whatever unit it decides is the most human readable).By default the XIV uses GB (decimal counting method) in the XIV GUI and CLI outputwhen displaying volume sizes.250 IBM XIV Storage System: Copy Services and Migration
It also must be clearly understood that a volume created on an XIV is created in 17 GBincrements, which are not exactly 17 GB. In fact, the size of an XIV 17 GB volume can bedescribed in four ways:GB17 GB (decimal), as shown in the XIV GUI, but actually rounded downto the nearest GB (see the number of bytes below).GiB 16 GiB (binary counting where 1 GiB = 2 30 bytes). This is exactly 16GiB.Bytes17,179,869,184 bytes.Blocks33,554,432 blocks (each block being 512 bytes).Thus, XIV is using binary sizing when creating volumes, but displaying it in decimal and thenrounding it down.The recommended volume size for XIV volumes presented to the SVC is 1632 GB (as viewedon the XIV GUI). There is nothing special about this volume size, it simply divides nicely tocreate on average four XIV volumes per XIV host port (for queue depth purposes).The size of a 1632 GB volume (as viewed on the XIV GUI) can be stated in four ways:GB1632 GB (decimal), as shown in the XIV GUI, but rounded down to thenearest GB (see the number of bytes below).GiB1520 GiB (binary counting where 1 GiB = 2 30 bytes). This is exactly1520 GiB.Bytes1,632,087,572,480 bytes.Blocks3,187,671,040 blocks (each block being 512 bytes).Note that the SVC reports each MDisk presented by XIV as 1520 GiB. Figure 8-3 shows whatthe XIV reports.Figure 8-3 An XIV volume sized for use with SVCIf you right-click the volume in the XIV GUI and display properties, you will be able to see thatthis volume is 3,187,671,040 blocks. If you multiply 3,187,671,040 by 512 (because there are512 bytes in a SCSI block) you will get 1,632,087,572,480 bytes. If you divide that by1,073,741,824 (the number of bytes in a binary GiB), then you will get 1520 GiB, which isexactly what the SVC reports for the same volume (MDisk), as shown in Example 8-4.Example 8-4 An XIV volume mapped to the SVCIBM_2145:SVCSTGDEMO:admin>svcinfo lsmdisk -bytesid name status mode capacity ctrl_LUN_# controller_name9 mdisk9 online unmanaged 1632087572480 0000000000000007 XIVIBM_2145:SVCSTGDEMO:admin>svcinfo lsmdiskid name status mode capacity ctrl_LUN_# controller_name9 mdisk9 online unmanaged 1520.0GB 0000000000000007 XIVChapter 8. SVC migration with XIV 251
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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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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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184 IBM XIV Storage System: Copy Se
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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
Page 216 and 217: 7.3.4 Create and activate a data mi
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Page 220 and 221: ►►►►►►►►Define host
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Page 228 and 229: eing generated by the migration pro
Page 230 and 231: If you chose to allow the XIV to de
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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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Page 252 and 253: We now allocate the ESS 800 LUNS to
Page 254 and 255: We can also use a script provided b
Page 256 and 257: We then get a warning message. The
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Page 260 and 261: 8.1 Steps to take when using SVC mi
Page 262 and 263: When a partially populated XIV has
Page 264 and 265: 8.3.3 Hardware dependenciesThere ar
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
Page 274 and 275: 2. List the newly detected MDisks,
Page 276 and 277: 8.7.2 Using VDisk mirroring to move
Page 278 and 279: 8.8.2 Create the MDisk groupWe must
Page 280 and 281: 8.9.2 Create the MDisk groupWe must
Page 282 and 283: In Example 8-42 we display the prog
Page 284 and 285: When an SVC volume is created we no
Page 286 and 287: In Example 8-55, we monitor the mig
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Page 290 and 291: the additional Fibre Channel ports
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Page 294 and 295: ► Fibre Channel SAN Configuration
Page 296 and 297: DR testingGUI steps 179DS4000 190,
Page 298 and 299: RRDAC 227-228reactivation 111Recove
Page 300 and 301: emote mirroring peers 110remote tar
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IBM XIV Storage System Copy Services and Migration

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