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HP XP7 Continuous Access Synchronous UserGuideAbstractContinuous Access Synchronous helps you create and maintain a synchronous backup of critical dat

Failover softwareHost failover software is used to transfer information between host servers at the local and remotesites. It is a critical component

DescriptionItem• Virtual Device Name1: Volume's vrtual device name, in the format:virtual emulation type/number of virtual LUSE volumes/virtual C

Mirrors tabCnt Ac-J/Cnt Ac-J Z only.DescriptionItemJournal identifier. Clicking opens the Journal Volumes window.Journal IDMirror identifier.Mirror ID

DescriptionItemmaster journal to the secondary mirror, both the primary and secondary mirrorswill have the same Path Watch Time value.• Yes: The Path

View Port ConditionDescriptionItemConnections (To)• System: Number of system-to-system connections from local to remote system.• CU: Number of CU-to-C

DescriptionItemRemote connection status.Status• Normal: All remote paths are normal.• Failed: All remote paths are abnormal.• Warning: Some remote pat

DescriptionItemPath group identifier.Path Group IDClicking opens the window for exporting the table information.ExportAdd Remote Connection wizardUse

Local Storage SystemDescriptionItemLocal model.ModelLocal serial number.Serial NumberCnt Ac-S Z only.Local CULocal system CU number. Displays when Con

DescriptionItemTime limit between 1 and 500 milliseconds for data copy from P-VOL to S-VOL(1 is the default).Cnt Ac-S Z only.FREEZE OptionEnables or d

DescriptionItemSpecified roundtrip time.Roundtrip Time (msec.)Specified FREEZE option.FREEZE OptionSelected Remote Paths tableDescriptionItemLocal sys

Remote Connection Properties tableDescriptionItemConnection Type• System: system-to-system connection.• CU: CU-to-CU connections.Local system CU numbe

When the host issues an update after the initial copy is complete, the data is written to the P-VOLand copied to the S-VOL. Subsequent updates are hel

Selected Remote Connection tableDescriptionItemConnection Type• System: system-to-system connection.• CU: CU-to-CU connections.Local system CU number.

Selected Remote Connection tableDescriptionItemMinimum number of remote paths.Minimum Number of Paths• Cnt Ac-S and Cnt Ac-S Z: Range is from 1 to 8.•

Confirm windowSelected Remote Connection tableDescriptionItemConnection Type• System: system-to-system connection.• CU: CU-to-CU connections.Local sys

Add Remote Paths windowUse this window to add remote paths to a remote connection.For complete information and instructions, see “Configuring addition

DescriptionItemPort lists• Left side list: local system port identifier.• Right side list: remote system port identifierClicking adds more paths, up t

DescriptionItemNumber of remote paths including those being added.Number of Remote PathsSpecified minimum number of remote paths.Minimum Number of Pat

Remote Storage SystemDescriptionItemRemote system model.ModelRemote system serial number.Serial NumberRemote system CU number.Remote CURemote system S

DescriptionItemInformation about the remote system.Remote Storage System• Model / Serial Number: Model and serial number.• CU: CU number.• SSID: SSID

In this topic, you can view the following tables.• “Setting Fields”• “Storage System Options”• “CU Options”Setting FieldsDescriptionItemType of pair:C

DescriptionItem• Cnt Ac-S Z: Continuous Access Synchronous Z• Cnt Ac-J Z: Continuous Access Journal ZStorage System OptionsDescriptionItemNumber of vo

2 Requirements and specificationsThis chapter provides basic system requirements. In addition to the information here, “Planning forContinuous Access

Change CU Options windowDescriptionItemNumber of volumes that can be copied per initial copy operation.Maximum Initial Copy ActivitiesCnt Ac-S Z only.

Confirm windowIn this topic, you can view the following tables.• “Storage System Options”• “CU Options ”Storage System OptionsDescriptionItemNumber of

DescriptionItemCnt Ac-S/Cnt Ac-S Z only.Path Blockade SIM Watch (sec.)Number of seconds for the system to monitor SIMs reported for blocked pathsCnt A

In this topic, you can view the following tables.• “Settings”• “Primary Volume Selection”• “Secondary Volume Selection”• “Mirror Selection”• “Options”

DescriptionItemLocal system's CU number. You can select the CU number of the local storagesystem between [00] and [FE].Selections in the remote s

Mirror SelectionCnt Ac-J and Cnt Ac-J Z only.DescriptionItemMaster journal number and type.Master JournalMirror's identifier.Mirror IDRestore jou

DescriptionItemCnt Ac-S Z only.Host I/O Time Stamp TransferWhether the host I/O time stamp is transferred from P-VOL to S-VOL.Cnt Ac-J and Cnt Ac-J Z

DescriptionItemScheduling order for pair create operation.Initial Copy PriorityCnt Ac-S Z only.CFW DataWhether CFW data is copied to the S-VOL.Cnt Ac-

DescriptionItemSelections for the initial S-VOL.Base Secondary VolumeCnt Ac-S and Cnt Ac-J only.• Port ID: Port identifier.• Host Group ID: Host group

DescriptionItemWhether data is copied to the S-VOL when the pair is created.Initial Copy Type• Entire Volume: Data is copied. The default.• None: Data

RequirementItemof 64 path groups are supported. Multiple path groups can be used in the samecombination of primary and secondary storage systems.Group

Confirm windowSelected Pairs tableDescriptionItemInformation about volumes in the accessed system.Local Storage System• LDEV ID: LDEV identifier.• LDE

DescriptionItemInformation about volumes in the system connected to the system you accessed.Remote Storage System• Model / Serial Number: Model and se

DescriptionItemWhether to split all pairs in the mirror if a failure occurs during this operation:• Mirror: Pairs in the mirror are split.• Volume: On

DescriptionItem• Pair Position: Whether volume is a P-VOL or S-VOL.• Emulation Type: Volume's emulation type.• Capacity: Volume's capacity.•

Confirm windowSelected Pairs tableDescriptionItemInformation about volumes in the accessed system.Local Storage System• LDEV ID: LDEV identifier.• LDE

DescriptionItemA hyphen displays if performing the split operation from the pair's secondarystorage system, regardless of the selected option.P-V

In this topic, you can view the following tables.• “Selected Pairs table”• “Setting Fields”Selected Pairs tableDescriptionItemInformation about volume

DescriptionItemWhether the consistency group is shared by multiple storage systems.CTG Utilization• Single: The consistency group consists of a single

Selected Pairs tableDescriptionItemInformation about volumes in the accessed system.Local Storage System• LDEV ID: LDEV identifier.• LDEV Name: LDEV n

For complete information and instructions, see “Deleting pairs” (page 56).In this topic, you can view the following tables.• “Selected Pairs table”• “

RequirementItemHost failover software• Required for disaster recovery.• Recommended for data migration.See “Host failover software” (page 32) for more

DescriptionItemPair's consistency group identifier.CTG IDWhether the consistency group is shared by multiple storage systems.CTG Utilization• Sin

Selected Pairs tableDescriptionItemInformation about volumes in the accessed system.Local Storage System• LDEV ID: LDEV identifier.• LDEV Name: LDEV n

Selected LDEVs tableDescriptionItemLDEV identifier.LDEV IDLDEV name.LDEV NameEmulation type.Emulation TypeCapacity.CapacityCLPR number.CLPREdit Pair O

DescriptionItemWhether the P-VOL can be written to when the pair is split due to error.Primary Volume Fence Level• Data: The P-VOL cannot be written t

Confirm windowSelected Pairs tableDescriptionItemInformation about volumes in the accessed system.Local Storage System• LDEV ID: LDEV identifier.• LDE

DescriptionItemPath group identifier.Cnt Ac-S Z only.Preserve Mirror StatusPreserve mirror status.View Pair Properties (Remote) windowUse this window

DescriptionItem• Provisioning Type: Volume's provisioning type.• Emulation Type, Capacity: Local system's emulation type and capacity.• Mode

DescriptionItemScheduling order for the initial copy operation.Initial Copy PriorityRange is 1 to 256 for Cnt Ac-S; 0 to 256 for Cnt Ac-S Z; default i

DescriptionItem• Pair Position: Whether the volume is a primary or secondary volume.• CLPR: Volume's CLPR.• Virtual storage machine: Virtual stor

In this topic, you can view the following tables.• “Settings”• “Histories table”SettingsDescriptionItemType of pair:Copy Type• Cnt Ac-S: Continuous Ac

3 Planning for Continuous Access SynchronousThis chapter provides information and instructions for planning primary and secondary system,pair volumes,

DescriptionItemInformation about volumes in the system connected to the system you accessed.Remote Storage System• LDEV ID: LDEV identifier.• Provisio

Glossaryallocation The ratio of allocated storage capacity versus total capacity as a percentage. Allocated storagerefers to those logical devices (LD

to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to accessa single large pool of storage.M-VOL Main volume.MC

IndexAadditional shared memory, 15Auto LUN, 44Bbandwidth, 32bitmap areas, 22Business Copy, sharing volumes, 41Ccache memory changes, and pair status,

Ooperations history, monitoring, 63overview, 7Ppair statuschanging cache or shared memory, 15, 61definitions, 60monitoring, 58pairscalculating maximum

NOTE: When using RAID Manager (or Raidcom), the XP7 serial number requires a prefixof "3".System optionsYou can tailor XP7 storage systems t

Note the following Round Trip Time considerations:• If the difference between Round Trip Time and remote IO response time is significant, thesystem sl

The following table shows example settings.Round triptimespecified[ms]Number of maximuminitial copy VOLsInitial copy paceNumber of datapaths betweenMC

Planning pairs and pair volumesThis section discusses requirements, options, and settings you need for setting up pairs and pairvolumes. You begin by:

© Copyright 2014 Hewlett-Packard Development Company, L.P.Confidential computer software. Valid license from HP required for possession, use or copyin

• Before creating multiple pairs during the Create Pairs operation, make sure to set up S-VOLLDEVs to allow the system to correctly match them to P-VO

of the following Fence Level options during the initial copy and resync operations. You can alsochange the Fence Level option outside these operations

Procedure 1 To calculate the maximum number of pairs1. Calculate the number of cylinders.1. Calculate the system's number of logical blocks, whic

3. Calculate the maximum number of pairs, which is restricted by the following:• The number of bitmap areas required for Continuous Access Synchronous

In this case, because the value of Maximum Initial Copy Activities is 2, initial copy operations forLUN 02 and LUN 00 are started. If either one of th

Figure notes:• Cnt Ac-S pairs are assigned to a consistency group using RAID Manager.Cnt Ac-S Z pairs are assigned to a consistency group using Busine

Figure notes:• RAID Manager manages the consistency group on all primary and secondary system. BusinessContinuity Manager cannot be used with multiple

• The microcode for both primary and secondary systems must support consistency groupsbetween multiple primary and secondary systems; otherwise, pair

5. Create RAID Manager configuration definition file C for the multiple primary and secondarysystem configuration.6. Perform the pairresync operation

• If a split operation is in progress when I/O processing on the pairs begins, the split operationon the pairs is given priority. After the pair is sp

Contents1 Continuous Access Synchronous overview...7How Continuous Access Synchronous works ...

Pair status before and after a split operationPairs in the same consistency group must be in PAIR/Duplex status when you begin the splitoperation in o

CG 127 behavior and restrictions when a pair is suspendedNote the following behaviors and restrictions regarding the consistent suspending of all P-VO

• If all the data paths for Continuous Access Synchronous pairs are disconnected, but the pathsused for Cnt Ac-J pairs are connected, failure suspend

Fibre Channel requirementsThe primary and secondary system must be connected using multimode or single-mode opticalfibre cables.• For distances betwee

Set port topology to: Fab off, FC-AL.Switch connectionThe following figure shows a switch connection, in which up to three optical fibre cables arecon

Figure 1 Extender Connection• Set port topology to the following:NL/FL port: Fab on, FC-AL◦◦ F port: Fab on, Point-to-Point• Best practice is to creat

Port attributesPlan and define the following Fibre Channel port attributes for Continuous Access Synchronous:• Initiator ports, which send data. One i

4 Sharing Continuous Access Synchronous volumesThis chapter helps you plan Continuous Access Synchronous (Cnt Ac-S) pair volumes when theyare shared w

Used as Cnt Ac-S S-VOL?Used as Cnt Ac-S P-VOL?Volume typeBusiness Copy (BC)YesYesP-VOL in PSUS (Delete pair to RCU) statusNoNoP-VOL in COPY(RS-R)/RCPY

Cache ResidencyThe volumes which set the Cache Residency can be assigned as the Continuous Access Synchronouspair. You can perform Cache Residency ope

Host failover software...32Data path requir

The following tables show Cnt Ac-S volumes and status with the Data Retention operations that canbe performed using Remote Web Console and RAID Manage

global virtualizationPairs can be created using volumes in a virtual storage machine. Please note the following:• Though Remote Web Console displays t

Please note the following when sharing Cnt Ac-S volumes with BC volumes.• L1 and L2 BC pairs can be shared with Cnt Ac-S volumes. Both node and leaf S

Configurations with Business Copy S-VOLsIn the following figure, an BC S-VOL also functions as a Cnt Ac-S P-VOL. This configuration requiresthat the B

Continuous Access JournalCnt Ac-S and Continuous Access Journal can share the same pair volumes. Using a combined CntAc-S and Continuous Access Journa

5 Cnt Ac-S configurationThis chapter provides instructions for configuring Continuous Access Synchronous.Configuration workflowYou must have Storage A

Procedure 7 To define port attributes1. In the Storage Systems tree, click Ports/Host Groups.2. In the Ports/Host Groups window, click the Ports tab a

• Another field, Minimum Number of Paths, is also covered in more detail in “DeterminingMinimum Number of Remote Paths” (page 18).• Remote path settin

2. For Minimum Number of Paths, select the minimum number of paths between the secondaryand primary system. If the number of paths drops below the min

4. Change Storage System Options as needed. Settings apply to the storage system.1. For Maximum Initial Copy Activities, specify the number of volumes

Configuring additional remote paths...69Changing minimum paths, round

1. Select the CU with the options to be changed, then click Change CU Options. If you donot want to change CU options, click Finish.2. In the Change C

6 Cnt Ac-S pair operationsThis chapter provides instructions for performing Continuous Access Synchronous pair operations.Pair operations workflowYou

• During this operation, you select P-VOLs and S-VOLs by port, GID, LUN CU, and/or LDEVnumbers.• During this operation, you can specify multiple P-VOL

1. For Base Secondary Volume, select the initial S-VOL's Port ID, Host Group ID, and LUNID. If you are selecting only one P-VOL, this LU is the s

When a pair is split:• I/O writes from the host continue to the P-VOL, but stop to the S-VOL.• Any current update copy operation completes to the S-VO

Enable is only available when performing the split operation from the pair's primarystorage system.• Disable (default), to cause host input to be

5. For Primary Volume Fence Level, specify whether the primary system rejects write operationsto the P-VOL when the pair is split due to an error.• -

5. For Delete Mode, specify one of the following:• Normal: Deletes the pair only if the primary system can change both P-VOL and S-VOLto unpaired volu

7 Monitoring and maintaining the Cnt Ac-S systemThis chapter provides information and instructions for monitoring and maintaining a ContinuousAccess S

3. From the Actions menu, click Remote Replication > View Pair Properties and review Status.For more information, see “Pair status definitions” (pa

Remove Remote Paths wizard...115Remove Remote Paths wind

◦ When a pair is deleted from the primary system, that system changes the status of theP-VOL and S-VOL to unpaired.◦ When a pair is deleted from the s

S-VOL accessP-VOL accessDescriptionRAID ManagerstatusRWC statusRead OnlyRead/WritePAIRPAIR• The pair is synchronized• Updates from the host to the P-V

Split typesThis topic discusses pairs that are split by user operation (PSUS ), and pairs that are suspendedby the system because of failure (PSUE).•

System behaviorNote the following behaviors for split pairs:• The primary system stops performing update operations to the S-VOL. It may or may notcon

4. The Description column displays operations. They are explained below.Note the following when viewing histories.• Operation rows may not appear in d

Prerequisite information• Pair status must be COPY or PAIR.• The Edit Pair Options window is used for the following procedure. If you select multiple

Prerequisite information• The volume must be unpaired.Procedure 19 To forcibly delete a pair1. In the Storage Systems tree, click Logical Device.2. Cl

Monitoring and maintaining remote connections and pathsProcedure 21 To view remote connection status and path information1. View connection properties

2. To check path and port information, from the Storage Systems tree, click Replication > RemoteConnections > Connections (To).Check connections

DefinitionStatusThis remote path was blockaded because a program error occurred.Program ErrorThis remote path is in progress of changing the attribute

1 Continuous Access Synchronous overviewA Continuous Access Synchronous system creates and maintains a mirror image of a productionvolume at a remote

2. Click the Connections (To) tab, then select the remote connection whose options you want tochange.3. From the Actions menu, click Remote Connection

6. Click Finish.7. In the Confirm window, review the settings and enter a task name in the Task Name box.8. Click Apply to save your settings in the s

(You can review information about the connection by clicking Detail.)6. Click Apply.Managing power-off for systems and network devicesThough you are r

Procedure 26 To perform a planned outage of a secondary system or data path component1. Identify the P-VOLs that are paired with S-VOL in the secondar

8 Data migrationThis chapter discusses using Continuous Access Synchronous to migrate data from one storagesystem to another.Migration overviewContinu

9 Disaster recoveryThis chapter discusses disaster recovery.Disaster recovery overviewPreparing for disaster recovery involves the following major ste

You can switch operations to the remote site either by deleting pairs, then reestablishing themwhen recovery is completed; or by not deleting pairs. B

The following table shows S-VOL consistency information, based on Remote Web Console pairstatus and the P-VOL fence level setting.Consistency of S-VOL

3. At the local site, delete the Cnt Ac-S association with the secondary systems (Remove RemoteConnection). In Remote Web Console, connect to each pri

10 TroubleshootingThis chapter provides Continuous Access Synchronous troubleshooting information.Error codes and messagesRemote Web Console displays

Typical componentsA typical configuration consists of the following components. Many but not all require user setup.• The primary XP7 storage system i

Corrective actionErrorThe paircreate or pairresync operation resultedin a timeout error.• Hardware failure: If the timeout error was caused by a hardw

Corrective actionDescriptionPath statussystem are being used forother connections.secondary systems, initiator ports for primary systems. Ifnecessary,

Corrective actionDescriptionPath statusRepair the path relay equipment, then restore the path*.The path relay equipmentdoes not work.Replace the broke

Where:• * is the instance number.• HOST is the host name.Example:Error codes appear on the right of the equal symbol (=).Review RAID Manager error cod

DescriptionError code(SSB2)The pair cannot be created because the consistency group number is greater than is allowed.B990If this error occurred when

DescriptionError code(SSB2)The command was rejected because the S-VOL status is unpaired.C233The command was rejected because an internal logical erro

DescriptionError code(SSB2)The P-VOL is in the process of drive copy for failure assistance.C316The P-VOL is in the process of drive copy for an SVP r

DescriptionError code(SSB2)A request for a Paircreate operation was rejected because the specified S-VOL was not mounted.C33CThe pair cannot be create

DescriptionError code(SSB2)The P-VOL is a device not supported by Cnt Ac-S.C3A0The SSID or CU number of the secondary system is invalid.C3A6The device

DescriptionError code(SSB2)The volume is a THP V-VOL; the pair using the volume is a BC, Fast Snap, or Snapshot pair, or a Auto LUNreserve volume.The

Volume pairsAs described previously, original data is stored in the P-VOL and the remote copy is stored in theS-VOL. The pair can be split, resynchron

DescriptionError code(SSB2)A pair cannot be created because the specified primary system is one of the following:CBD8• A journal volume used for Cnt A

DescriptionError code(SSB2)The specified local storage system does not support global virtualization.FD05The pair cannot be created because the volume

11 Support and other resourcesContacting HPFor worldwide technical support information, see the HP support website:http://www.hp.com/supportBefore con

HP websitesFor additional information, see the following HP websites:• http://www.hp.com• http://www.hp.com/go/storage• http://www.hp.com/service_loca

Table 1 Document conventions (continued)ElementConventionMonospace text• File and directory names• System output• Code• Commands, their arguments, an

A Cnt Ac-S GUI referenceThis appendix describes Remote Web Console windows and fields used for Continuous AccessSynchronous. The following key topics

Summary sectionDescriptionItemUsed capacity and licensed capacity for each local and remote replicationprogram product.Licensed Capacity (Used/License

DescriptionItemClicking opens the window for exporting the table information.Export*This item does not display unless you add it in the Remote Web Con

DescriptionItem• Pair Position: Whether the volume is a primary or secondary volume.• Provisioning Type1: Volume's provisioning type.• Emulation

DescriptionItemClicking opens the Create Pairs window.Create PairsClicking opens the Split Pairs window.Split PairsClicking opens the Resync Pairs win