IBM XIV Storage System Copy Services and Migration

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6.5.2 Mirroring ongoing operationFollowing the completion of the initialization phase, the master examines the synchronizationstatus at scheduled intervals and determines the scope of the synchronization. The followingprocess occurs whenever a synchronization is started:1. A snapshot of the master is created.2. The master calculates the differences between the master snapshot and the most recentmaster snapshot that is synchronized with the slave.3. The master establishes a synchronization process called a sync job that replicates thedifferences from the master to the slave. Only data differences are replicated.Details of this process can be found in 6.6, “Detailed asynchronous mirroring process” onpage 173.6.5.3 Mirroring consistency groupsThe synchronization status of the consistency group is determined by the status of allvolumes pertaining to this consistency group.► The activation and deactivation of a consistency group affects all of its volumes.► Role updates concerning a consistency group affect all of its volumes.►►It is impossible to directly activate, deactivate, or update the role of a given volume within aconsistency group.It is not possible to directly change the schedule of an individual volume within aconsistency group.6.5.4 Mirroring special snapshotsThe status of the synchronization process and the scope of the sync job are determinedthrough the use of the following two special snapshots:► Most_recent snapshotThis snapshot is the most recent taken of the master system, either a volume orconsistency group. This snapshot is taken prior to the creation of a new sync job. Thisentity is maintained on the master system only.► Last_replicated snapshotThis is the most recent snapshot that has been fully synchronized with the slave system.This snapshot is duplicated from the most_recent snapshot after the sync job is complete.This entity is maintained on both the master and the slave systems.Snapshot life-cycleThroughout the sync job life cycle, the most_recent and last_replicated snapshots are createdand deleted to denote the completion of significant mirroring stages.172 IBM XIV Storage System: Copy Services and Migration
This mechanism bears the following characteristics and limitations:► The last_replicated snapshots have two available time stamps:– On the master system: the time that the last_replicated snapshot is copied from themost_recent snapshot– On the slave system: the time that the last_replicated snapshot is copied from themaster system► No snapshot is created during the initialization phase.► Snapshots are deleted only after newer snapshots are created.► A failure in creating a last-replicated snapshot caused by space depletion is handled in adesignated process. See 6.8, “Pool space depletion” on page 182, for additionalinformation.► Snapshots that are created by the snap now operation are retained and automaticallynamed by the system. This is identical to the last_replicated snapshot until a new sync jobruns.Table 6-1 indicates which snapshot is created for a given sync job phase.Table 6-1 Snapshots and sync job phasesSync jobphaseMost_RecentsnapshotLast_ReplicatedsnapshotDetails1 New intervalstarts.Created onthe mastersystemThe most_recent snapshot is createdonly if there is no sync job running.2 Calculate thedifferences.The difference between themost_recent snapshot and thelast_replicated snapshot is transferredfrom the master system to the slavesystem.3 The sync job iscomplete.Created on theslave systemThe last_replicated snapshot on theslave system is created from thesnapshot that has just been mirrored.4 Following thecreation of thelast_Replicatedsnapshot.Created on themaster systemThe last_replicated snapshot on themaster system is created from themost_recent snapshot.6.6 Detailed asynchronous mirroring processAfter initialization is complete sync job schedules become active (unless schedule =never orType = external is specified for the mirror). This starts a specific process that replicates aconsistent set of data from the master to the slave. This process uses special snapshots topreserve the state of the master and slave during the synchronization process. This allowsthe changed data to be quantified and provides synchronous data points that can be used fordisaster recovery. See 6.5.4, “Mirroring special snapshots” on page 172.Chapter 6. Asynchronous Remote Mirroring 173
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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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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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