IBM XIV Storage System Copy Services and Migration

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An example of selecting which method to use is shown in Figure 7-2. The check box must beselected to enable source updating, shown here as Keep Source Updated. Without this boxchecked, changed data from write operations is only written to the XIV.Figure 7-2 Keep Source Updated check boxSource updatingThis method for handling write requests ensures that both storage systems (XIV and non-XIVstorage) are updated when a write I/O is issued to the LUN being migrated. By doing this thesource system remains updated during the migration process, and the two storage systemsremain in sync after the background copy process completes. Similar to synchronous RemoteMirroring, the write commands are only acknowledged by the XIV Storage System to the hostafter writing the new data to the local XIV volume, then writing to the source storage device,and then receiving an acknowledgement from the non-XIV storage device.An important aspect of selecting this option is that if there is a communication failure betweenthe target and the source storage systems or any other error that causes a write to fail to thesource system, the XIV Storage System also fails the write operation to the host. By failingthe update, the systems are guaranteed to remain consistent. Change managementrequirements determine whether you choose to use this option.No source updatingThis method for handling write requests ensures that only the XIV volume is updated when awrite I/O is issued to the LUN being migrated. This method for handling write requestsdecreases the latency of write I/O operations because write requests are only written to theXIV volume and are not written to the non-XIV storage system. It must be clearly understoodthat this limits your ability to back out a migration, unless you have another way of recoveringupdates that were written to the volume being migrated after migration began. If the host isbeing shutdown for the duration of the migration then this risk is mitigated.Multi-pathing with data migrationsThere are essentially two types of enterprise storage systems when it comes to multi-pathing:►Active/active: These are storage systems where volumes can be active on all of thestorage system controllers at the same time (whether there are two controllers or more).These systems support IO activity to any given volume down two or more paths. Thesetypes of systems typically support load balancing capabilities between the paths with pathfailover and recovery in the event of a path failure. The XIV is such a device and can utilize188 IBM XIV Storage System: Copy Services and Migration
►this technology during data migrations. Examples of IBM products that are active/activestorage servers are the DS6000, DS8000, ESS F20, ESS 800, and SVC. Note that theDS6000 and SVC are examples of storage servers that have preferred controllers on aLUN-by-LUN basis, but that if attached hosts ignore this preference, a potentialconsequence is the risk of a small performance penalty.If your non-XIV disk system supports active/active then you can carefully configuremultiple paths from XIV to non-XIV disk. The XIV load balances the migration traffic acrossthose paths and it automatically handles path failures.Active/passive: These are storage platforms where any given volume can be active ononly one controller at a time. These storage devices do not support I/O activity to anygiven volume down multiple paths at the same time. Most support active volumes on oneor more controllers at the same time, but any given volume can only be active on onecontroller at a time. An example of an IBM product that is an active/passive storage deviceis the DS4700.Migrating from an active/active storage deviceIf your non-XIV disk system supports active/active LUN access then you can configuremultiple paths from XIV to the non-XIV disk system. The XIV load balances the migrationtraffic across these paths. This may lead to the temptation to configure more than twoconnections or to increase the initialization speed to a very large value to speed up themigration. However, the XIV only synchronizes one volume at a time per target (with fourtargets, this means that four volumes could be being copied at once). This means that thespeed of the migration from each target is determined by the ability of the non-XIV storagedevice to read from the LUN currently being migrated. Unless the non-XIV storage device hasstriped the volume across multiple RAID arrays, the migration speed is unlikely to exceed250–300 MBps (and could be much less), but this is totally dependant on the non-XIV storagedevice.Important: If multiple paths are created between an XIV and an active/active storagedevice, the same SCSI LUN IDs must be used for each LUN on each path, or datacorruption may occur.Migrating from an active/passive storage deviceBecause of the active/active nature of XIV, special considerations must be made whenmigrating data from an active/passive storage device to XIV. A single path is configuredbetween any given non-XIV storage device controller and the XIV system. Many users decideto perform migrations with the host applications offline, due to the single path.►Define the target to the XIV per non-XIV storage controller (controller, not port). Defineonly one path from that controller to the XIV. All volumes active on the controller can bemigrated using the defined target for that controller. For example, suppose the non-XIVstorage device contains two controllers (A and B):– Define one target (called, for example, CX-A) with one path between the XIV and onecontroller on the non-XIV storage device (for example, controller A). All volumes activeon this controller can be migrated by using this target. When defining the XIV initiator tothe controller, be sure to define it as not supporting fail-over. By doing so, volumes thatare passive on the A controller are not presented to the XIV. Check your non-XIVstorage device documentation for how to do this.– Define another target (called, for example, CX-B) with one path between the XIV andcontroller B. All volumes active down the B controller can be migrated to the XIV byusing this target. When defining the XIV initiator to the controller, be sure to define it asnot supporting failover. By doing so, volumes that are passive on the B controller areChapter 7. Data migration 189
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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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Page 162 and 163: 5.5.4 Phase 4: switching production
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Page 178 and 179: Change RPO and intervalThe required
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Page 196 and 197: Figure 6-42 New master volumesAfter
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Page 244 and 245: In Example 7-10 the XCLI commands s
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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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