IBM XIV Storage System Copy Services and Migration

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8.3.3 Hardware dependenciesThere are two Fibre Channel HBAs in each XIV interface module. From a physicalperspective:► Ports 1 and 2 are on the left-hand HBA (viewed from the rear).► Ports 3 and 4 are on the right-hand HBA (viewed from the rear).From a configuration perspective:► Ports 1, 2, and 3 are in SCSI target mode by default.► Port 4 is set to SCSI initiator mode by default (for XIV replication and data migration).For availability and performance use ports 1 and 3 for SVC and general host traffic. If youhave two fabrics, place port 1 in the first fabric and port 3 in the second fabric.8.3.4 Sharing an XIV with another SVC cluster or non-SVC hostsIt is possible to share XIV host ports between an SVC cluster and non-SVC hosts, or betweentwo different SVC clusters. Simply zone the XIV host ports 1 and 3 on each XIV module toboth SVC and non-SVC hosts as required.You can instead choose to use ports 2 and 4, although in principle these are reserved for datamigration and remote mirroring. For that reason port 4 on each module is by default in initiatormode. If you want to change the mode of port 4 to target mode, you can do so easily from theXIV GUI or XCLI. However, you may also need an RPQ from IBM. Contact your IBM XIVrepresentative to discuss this.8.3.5 Zoning rulesThe XIV-to-SVC zone should simply contain all the XIV ports in that fabric and all the SVCports in that fabric. In other words one big zone. This recommendation is relatively unique toSVC. If you zone individual hosts directly to the XIV (instead of via SVC), then you shouldalways use single-initiator zones where each switch zone contains just one host (initiator)HBA WWPN and up to six XIV host port WWPNs.For SVC, ensure that the following rules are followed:► With current SVC firmware levels, no more than 16 WWPNs from a single WWNN shouldbe zoned to an SVC cluster. Because the XIV has only one WWNN, this means that nomore than 16 XIV host ports should be zoned to a specific SVC cluster. If you use therecommendations in Table 8-1 on page 246 this restriction should not be an issue.► All nodes in an SVC cluster must be able to see the same set of XIV host ports. Operationin a mode where two nodes see a different set of host ports on the same XIV will result inthe controller showing on the SVC as degraded and the system error log will request arepair action. If the one big zone per fabric rule is followed, then this requirement is met.8.4 Volume size considerations for XIV with SVCThere are several considerations when migrating data onto XIV using SVC. Volume sizes isclearly an important one.248 IBM XIV Storage System: Copy Services and Migration
8.4.1 SCSI queue depth considerationsThe SVC uses one XIV host port as a preferred port for each MDisk (assigning them in around-robin fashion). A best practice is to therefore configure sufficient volumes on the XIV toensure that:► Each XIV host port will receive closely matching I/O levels.► The SVC will utilize the deep queue depth of each XIV host port.Ideally, the number of MDisks presented by the XIV to the SVC should be a multiple of thenumber of XIV host ports, from one to four. However, there is good math to support this.The XIV can handle a queue depth of 1400 per Fibre Channel host port and a queue depth of256 per mapped volume per host port:target port:volume tuple. However, the SVC sets thefollowing internal limits:► The maximum queue depth per MDisk is 60.► The maximum queue depth per target host port on an XIV is 1000.Based on this knowledge, we can determine an ideal number of XIV volumes to map to theSVC for use as MDisks by using this algorithm:Q = ((P x C) / N) / MThis breaks out as follows:QThe calculated queue depth for each MDiskPThe number of XIV host ports (unique WWPNs) visible to the SVCcluster (should be 4, 8, 10, or 12 depending on the number of modulesin the XIV)N The number of nodes in the SVC cluster (2, 4, 6, or 8)MThe number of volumes from the XIV to the SVC cluster (detected asMDisks)C1000 (which is the maximum SCSI queue depth that an SVC will usefor each XIV host port)If a 2-node SVC cluster is being used with 12 ports on IBM XIV System and 48 MDisks, thisyields a queue depth that as follows:Q = ((12 ports*1000)/2 nodes)/48 MDisks = 125Because 125 is greater than 60, the SVC uses a queue depth of 60 per MDisk. If a 4-nodeSVC cluster is being used with 12 host ports on the IBM XIV System and 48 MDisks, thisyields a queue depth that as follows:Q = ((12 ports*1000)/4 nodes)/48 MDisks = 62Because 62 is greater than 60, the SVC uses a queue depth of 60 per MDisk.Chapter 8. SVC migration with XIV 249
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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
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
Page 224 and 225: - Source LUN: Enter the decimal val
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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 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 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 266 and 267: This leads to the following recomme
Page 268 and 269: 8.4.3 Creating XIV volumes that are
Page 270 and 271: If your SVC uses firmware Version 5
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
Page 288 and 289: The VDisk moves from being in image
Page 290 and 291: the additional Fibre Channel ports
Page 292 and 293: TasknumberCompleted?Where toperform
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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