Title

PlannedSyncTargetWorkloadSwitchUsingSRDF/Star_sym001 Planned Synchronous Target Workload Switch Using SRDF/Star

Overview

This procedure provides the steps required to gracefully shut down the primary workload site (SiteA) and switch the SDRF/Star protection to the synchronous target site (SiteB). This procedure shows the switch from SiteA to SiteB and the subsequent protection of data with SRDF/A protection.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 NotesThese documents can be obtained from the EMC Powerlink website at:

http://Powerlink.EMC.comNote: 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 the control server for the primary workload site (SiteA) and examine the protection status 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:

(Pay close attention to the System State values.)

Site Name : SiteA

Workload Site : SiteA

1st Target Site : SiteB

2nd Target Site : SiteC

Composite Group Name : train125

Composite Group Type : RDF1

Workload Data Image Consistent : Yes

System State:

{

1st_Target_Site : Protected

2nd_Target_Site : Protected

STAR : Protected

Mode of Operation : Concurrent

}

Last Action Performed : Enable

Last Action Status : Successful

Last Action Timestamp : 06/15/2010_10:54:13

. . .

(

2. Shut down ALL host applications at the current workload site (synchronous target site - SiteA) using devices within the Star composite group that is being switched. Once all applications have been shut down, halt the Star system by executing a command similar to the following (from the primary workload site):

symstar -cg train125 halt

! Caution: The halt operation write disables all devices in the composite group at all sites. Ensure no applications are using the devices at any site before executing this command. !When this command is executed, you should see a message similar to the following:

A Star Halt operation is in progress for composite group train125. Please wait...

Halt ......................................................... Started

. . .Halt ......................................................... Done

(

3. Log in to a control host at the designated new workload site (synchronous target site -SiteB) and switch the workload to that site by executing a command similar to the following:

symstar -cg train125 switch -site SiteB

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

Switch_SiteB .................................................. Started

. . .Switch_SiteB .................................................. Done

Note: Upon completion of the switch operation, the devices in the Star composite group are Read/Write enabled at the new workload site and may be used by hosts at that site.(

4. Optionally, protect the data at the new workload site using SRDF/Star by executing a set of commands similar to the following (from the new workload site):symstar -cg train125 connect -site SiteA

symstar -cg train125 connect -site SiteC

symstar -cg train125 protect -site SiteA

symstar -cg train125 protect -site SiteC

symstar -cg train125 enable

Once these commands have been executed, verify that SRDF/Star protection has been 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 : SiteB

Workload Site : SiteB

1st Target Site : SiteA

2nd Target Site : SiteC

Composite Group Name : train125

Composite Group Type : RDF1

Workload Data Image Consistent : Yes

System State:

{

1st_Target_Site : Protected

2nd_Target_Site : Protected

STAR : Protected

Mode of Operation : Concurrent

}

. . .

(

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PlannedSyncTargetWorkloadSwitchUsingSRDF/Star_sym001