IBM XIV Storage System Copy Services and Migration

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4.7 Advantages of XIV mirroringXIV remote mirroring provides all the functions typical of remote mirroring solutions in additionto the following advantages:► Both synchronous and asynchronous mirroring are supported on a single XIV system.►►►►►►XIV mirroring is supported for consistency groups and individual volumes and mirroredvolumes may be dynamically moved into and out of mirrored consistency groups.XIV mirroring is data aware. Only actual data is replicated.Synchronous mirroring automatically resynchronizes couplings when a connectionrecovers after a network failure.Both FC and iSCSI protocols are supported, and both may be used to connect betweenthe same XIV systems.XIV mirroring provides an option to automatically create slave volumes.XIV allows user specification of initialization and resynchronization speed.4.8 Mirroring eventsThe XIV system generates events for user actions, failures, and changes in mirroring status.These events can be used to trigger SNMP traps and send e-mails or text messages.Thresholds for RPO and for link disruption may be specified by the user and trigger an eventwhen the threshold is reached.4.9 Mirroring statisticsThe XIV system provides Remote Mirroring performance statistics via both the graphical userinterface (GUI) and the command-line interface (XCLI) using the mirror_statistics_getcommand.Performance statistics from the FC or IP network components are also extremely useful.4.10 BoundariesWith Version 10.2, the XIV Storage System has the following boundaries or limits:► Maximum remote systems: The maximum number of remote systems that can beattached to a single primary is 16.► Number of remote mirrors: The combined number of master and slave volumes (includingin mirrored CG) cannot exceed 512.► Distance: Distance is only limited by the response time of the medium used. Useasynchronous mirroring when the distance causes unacceptable delays to the host I/O insynchronous mode.► Consistency groups are supported within Remote Mirroring. The maximum number ofconsistency groups is 256.112 IBM XIV Storage System: Copy Services and Migration
►►►Snapshots: Snapshots are allowed with either the primary or secondary volumes withoutstopping the mirror. There are also special-purpose snapshots used in the mirroringprocess. Space must be available in the storage pool for snapshots.Master and slave peers cannot be the target of a copy operation and cannot be restoredfrom a snapshot. Peers cannot be deleted or formatted without deleting the coupling first.Master volumes cannot be resized or renamed if the link is operational.4.11 Using the GUI or XCLI for Remote Mirroring actionsThis section illustrates Remote Mirroring definition actions through the GUI or XCLI.4.11.1 Initial setupWhen preparing to set up Remote Mirroring, take the following questions into consideration:► Will the paths be configured via SAN or direct attach, FC or iSCSI?► Is the desired port configured as an initiator or a target?– The port 4 default configuration an initiator.– Port 2 is suggested as the target port for remote mirror links.– Ports can be changed if needed.► How many pairs will be copied?This is related to the bandwidth needed between sites.► How many secondary machines will be used for a single primary?Remote Mirroring can be set up on paths that are either direct or SAN attached via FC oriSCSI protocols. For most disaster recovery solutions, the secondary system will be located ata geographically remote site. The sites will be connected using either SAN connectivity withFibre Channel Protocol (FCP) or Ethernet with iSCSI. In certain cases, using direct connectmight be the option of choice if the machines are located near each other and could be usedfor initialization before the target XIV Storage System is moved to the remote site.Bandwidth considerations must be taken into account when planning the infrastructure tosupport the Remote Mirroring implementation. Knowing when the peak write rate occurs forsystems attached to the storage will help with the planning for the number of paths needed tosupport the Remote Mirroring function and any future growth plans.When the protocol has been selected, it is time to determine which ports on the XIV StorageSystem will be used. The port settings are easily displayed using the XCLI Sessionenvironment and the command fc_port_list for Fibre Channel or ipinterface_list foriSCSI.There must always be a minimum of two paths configured within Remote Mirroring for FCPconnections, and these paths must be dedicated to Remote Mirroring. These two paths mustbe considered a set. Use port 4 and port 2 in the selected interface module for this purpose.For redundancy, additional sets of paths must be configured in different interface modules.Fibre Channel paths for Remote Mirroring have slightly more requirements for setup, and welook at this interface first.Chapter 4. Remote Mirroring 113
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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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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 88 and 89: 4.1 XIV Remote Mirroring overviewTh
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
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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
Page 138 and 139: 4.11.3 XCLI examplesXCLI commands c
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Page 142 and 143: 5.1 Synchronous mirroring configura
Page 144 and 145: - Slave CG / VolumeThis is the name
Page 146 and 147: 2. On the Secondary XIV go to the R
Page 148 and 149: Adding a mirrored volume to a mirro
Page 150 and 151: 5.3 Role reversalWith synchronous m
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Page 156 and 157: Example 5-8 List mirror couplingsFi
Page 158 and 159: 5.5.3 Phase 3: recovery of the prim
Page 160 and 161: Reactivating the remote mirror coup
Page 162 and 163: 5.5.4 Phase 4: switching production
Page 164 and 165: 5. Reassign volumes back to the pro
Page 166 and 167: 6.1 Asynchronous mirroring configur
Page 168 and 169: The slave volume must be unlocked a
Page 170 and 171: Using XCLI for volume mirroring set
Page 172 and 173: consistency group requires the volu
Page 174 and 175: Go to the Mirroring panel and verif
Page 176 and 177: -- 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
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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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