IBM XIV Storage System Copy Services and Migration

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4.1 XIV Remote Mirroring overviewThe purpose of mirroring is to create a set of consistent data that can be used by productionapplications in the event of problems with production volumes or for other purposes.XIV remote mirroring is application and operating system independent, and does not requireserver processor cycle usage.4.1.1 XIV Remote Mirror terminologyIt is worth going through and becoming familiar with several terms used throughout the nextchapters involving remote mirroring. A number of terms, meanings, and usage with regards toXIV and synchronous remote mirroring are noted below:► Local site: This site is made up of the primary storage and the servers runningapplications with the XIV Storage System.► Remote site: This site holds the mirror copy of the data on another XIV Storage Systemand usually standby servers as well. In this case, the remote site is capable of becomingthe active production site with consistent data available in the event of a failure at the localsite.► Primary: This denotes the XIV designated under normal conditions to serve hosts andhave its data replicated to a secondary XIV for disaster recovery purposes.► Secondary. This denotes the XIV designated under normal conditions to act as the mirror(backup) for the primary, and that could be set to replace the primary if the primary fails.► Consistency groups (CG): A consistency group is a set of related volumes on the sameXIV Storage System that are treated as a single consistent unit. Consistency groups aresupported within Remote Mirroring.► Coupling: This is the pairing of volumes or consistency groups (CGs) to form a mirrorrelationship between the source of the replication (master) and the target (slave).► Peer: This is one side of a coupling. It can either be a volume or a consistency group.However, peers must be of the same type (that is, both volumes or CGs). Whenever acoupling is defined, a role is specified for each peer. One peer is designated as the masterand the other peer is designated as the slave.► Role: This denotes the actual role that the peer is fulfilling:– Master: A role that indicates that the peer serves host requests and acts as the sourcefor replication. Changing a peer’s role to master from slave may be warranted after adisruption of the current master’s service either due to a disaster or to planned servicemaintenance.– Slave: A role that indicates that the peer does not serve host requests and acts as thetarget for replication. Changing a peer’s role to slave from master may be warrantedafter the peer is recovered from a site/system/link failure or disruption that led to thepromotion of the other peer from slave to master. Changing roles can also be done inpreparation for supporting a planned service maintenance.► Sync job: This applies to async mirroring only. It denotes a synchronization procedure runby the master at specified user-configured intervals corresponding to the asynchronousmirroring definition or upon manual execution of a dedicated XCLI command (the relatedcommand is mirror_create_snapshot). The resulting job is dubbed snapshot mirror syncjob or ad-hoc sync job, or manual sync job in contrast with a scheduled sync job. The syncjob entails synchronization of data updates recorded on the master since the creation timeof the most recent snapshot that was successfully synchronized.72 IBM XIV Storage System: Copy Services and Migration
►►Asynchronous schedule interval: This applies to asynchronous mirroring only. Itrepresents, per given coupling, how often the master automatically runs a new sync job.For example, if the pertinent mirroring configuration parameter specifies a 60-minuteinterval, then during a period of 1 day, 24 sync jobs will be created.Recovery Point Objective (RPO): The RPO is a setting that is only applicable toasynchronous mirroring. It represents an objective set by the user implying the maximalcurrency difference considered acceptable between the mirror peers (the actual differencebetween mirror peers can be shorter or longer than the RPO set).An RPO of zero indicates that no currency difference between the mirror peers isacceptable. An RPO that is greater than zero indicates that the replicated volume is lesscurrent or lags somewhat behind the master volume, and that there is a potential forcertain transactions that have been run against the production volume to be rerun whenapplications come up on the replicated volume.For XIV asynchronous mirroring, the required RPO is user-specified. The XIV system thenreports effective RPO and compares it to the required RPO.Connectivity, bandwidth, and distance between the XIV system that contains theproduction volume and the XIV system that contains the replicated copy directly impactRPO. More connectivity, greater bandwidth, and less distance typically enable a lowerRPO.4.1.2 XIV Remote Mirroring modesAs mentioned in our introduction, XIV supports both synchronous mirroring andasynchronous mirroring:►XIV synchronous mirroringXIV synchronous mirroring is designed to accommodate a requirement for zero RPO.To ensure that data is also written to the Secondary XIV (slave role), an acknowledgementof the write operation to the host is only issued after the data has been written to both XIVsystems. This ensures the consistency of mirroring peers. A write acknowledgement issent to the host once the write data has been cached into two separate XIV modules ateach site. This is depicted in Figure 4-1.Host Server1241. Host Write to Master XIV(data placed in cache of 2Modules)2. Master replicates to SlaveXIV (data placed in cache of2 Modules)3. Slave acknowledges writecomplete to Master4. Master acknowledges writecomplete to applicationLocal XIV(Master)3Remote XIV(Slave)Figure 4-1 XIV synchronous mirroringChapter 4. Remote Mirroring 73
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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
Page 38 and 39: To examine the details of the scena
Page 40 and 41: Restriction: Volumes in a consisten
Page 42 and 43: When created, the consistency group
Page 44 and 45: The new snapshots are created and d
Page 46 and 47: To obtain details about a consisten
Page 48 and 49: Example 1-12 illustrates the snap_g
Page 50 and 51: 1.5 MySQL database backup exampleMy
Page 52 and 53: Before running the backup script, a
Page 54 and 55: # XCLI command to perform the backu
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Page 58 and 59: 2.1 OverviewThis section includes a
Page 60 and 61: Figure 2-2 shows the Tivoli Storage
Page 62 and 63: ►For exchange data, the Microsoft
Page 64 and 65: 2.4.1 XIV VSS Provider installation
Page 66 and 67: Provide specific information regard
Page 68 and 69: The Windows server is now ready to
Page 70 and 71: 3. The Requirements Check dialog wi
Page 72 and 73: 5. The completion window shown in F
Page 74 and 75: To perform a VSS snapshot backup of
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Page 78 and 79: To see a list of the available VSS
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Page 82 and 83: 3.1 Volume copy architectureThe vol
Page 84 and 85: Figure 3-2 provides an example of t
Page 86 and 87: After the copy is complete, power u
Page 90 and 91: ►Host read operations are perform
Page 92 and 93: Figure 4-4 shows remote mirror conn
Page 94 and 95: 4.2.2 Operational proceduresMirrori
Page 96 and 97: After mirroring has been implemente
Page 98 and 99: 4.3 XIV Remote Mirroring usageRemot
Page 100 and 101: ►Metro region plus out-of-region
Page 102 and 103: Figure 4-15 shows an XIV local snap
Page 104 and 105: ►XIV target configuration: synchr
Page 106 and 107: ►XIV target configuration: bi-dir
Page 108 and 109: Connections must be made between po
Page 110 and 111: In Figure 4-28, five of the seven e
Page 112 and 113: If multiple volumes will have depen
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Page 116 and 117: In synchronous mirroring, during st
Page 118 and 119: 4.4.11 Mirror reactivation and resy
Page 120 and 121: ►►The volume mirroring settings
Page 122 and 123: 4.4.16 Deleting mirror coupling def
Page 124 and 125: 10.Unmap master peers at XIV 2 from
Page 126 and 127: 6. Remove connectivity between the
Page 128 and 129: 4.7 Advantages of XIV mirroringXIV
Page 130 and 131: As seen in Example 4-1, in the Role
Page 132 and 133: hover the mouse over a port, as sho
Page 134 and 135: Selecting Configure opens a configu
Page 136 and 137: 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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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
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7.3.4 Create and activate a data mi
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Important: If this is an online mig
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►►►►►►►►Define host
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4. Click New for a new system varia
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- Source LUN: Enter the decimal val
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The rate parameters can only be set
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eing generated by the migration pro
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If you chose to allow the XIV to de
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that volume must have been deleted
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►The volume on the source non-XIV
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7.10.4 Back-out after a data migrat
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TasknumberCompleted?Where toperform
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Using Microsoft calculator to conve
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7.12.3 HDS TagmaStore USPIn this se
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In Example 7-10 the XCLI commands s
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1011 0003 10.0 5001738000230153 Nex
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Using XIV DM to migrate an AIX file
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zone: nextrazap_dolly_fcs110:00:00:
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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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