TransientLinkRecoveryUsingSRDF/Star_sym001

Transient Link Recovery Using SRDF/StarOverview

This procedure provides the steps required recover from a PathFail condition between the workload site and either target site.

This procedure is based on content from the following EMC technical documentation:

EMC® Solutions Enabler Symmetrix® SRDF® Family CLI White Paper: Implementing EMC SRDF/Star Composite Groups on Open Systems

Applied Technology EMC Solutions Enabler Using SYMCLI to Implement SRDF/Star Technical Notes

These documents can be obtained from the EMC Powerlink website at:

http://Powerlink.EMC.com

Note: For this procedure, the primary workload site is named “SiteA,” the synchronous target site is “SiteB,” and the asynchronous target site is “SiteC,” as shown in the following illustration:

1. Log in to a control server at the primary workload site (SiteA) and query the state of the 1st Target site (SiteB) and the 2nd Target site (SiteC) by executing a command similar to the following:

symstar -cg train125 query

When this command is executed, you should see output similar to the following:

Site Name : SiteA

Workload Site : SiteA1st Target Site : SiteB2nd Target Site : SiteC

TransientLinkRecoveryUsingSRDF/Star_sym001

Composite Group Name : train125Composite Group Type : RDF1

Workload Data Image Consistent : YesSystem State: { 1st_Target_Site : PathFail 2nd_Target_Site : Protected STAR : Tripped Mode of Operation : Concurrent }. . .

Identify the site in the “PathFail” state.

2. From a control server for the primary workload site (SiteA), reset the links for the identified PathFail site by executing a command similar to the following.

symstar -cg train125 reset -site SiteB

When this command is executed, you should see output similar to the following:

A STAR Reset operation is in progress for composite group train125. Please wait...

Reset_SiteB ................................................ StartedMSC Cleanup ................................................ Not neededSetting Star data consistency indicators ................... StartedSetting Star data consistency indicators ................... DoneDisable STAR protection .................................... StartedDisable STAR protection .................................... DoneDeactivate STAR target ..................................... Not neededDeactivate STAR target SID:000194900093 .................... StartedDeactivate STAR target SID:000194900093 .................... DoneDeactivate STAR target SID:000194900106 .................... StartedDeactivate STAR target SID:000194900106 .................... DoneDisable RDF Consistency protection ......................... StartedDisable RDF Consistency protection ......................... DoneSet Mode Adaptive Copy SID:000194900095 RDFG:189 ........... StartedSet Mode Adaptive Copy SID:000194900095 RDFG:189 ........... DoneReset_SiteB ................................................ Done

3. Protect the data at the site that was reset using SRDF/Star by executing a set of commands similar to the following (from the primary workload site):

symstar -cg train125 connect -site SiteBsymstar -cg train125 protect -site SiteBsymstar -cg train125 enable

Once these commands have been executed, verify that SRDF/Star protection is enabled by executing a command similar to the following:

symstar -cg train125 query

When this command is executed, you should see output similar to the following:

Site Name : SiteA

Workload Site : SiteA1st Target Site : SiteB

TransientLinkRecoveryUsingSRDF/Star_sym001

2nd Target Site : SiteC

Composite Group Name : train125Composite Group Type : RDF1

Workload Data Image Consistent : YesSystem State: { 1st_Target_Site : Protected 2nd_Target_Site : Protected STAR : Protected Mode of Operation : Concurrent }

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TransientLinkRecoveryUsingSRDF/Star_sym001