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Dell EMC Solutions Enabler 9.2 SRDF Family CLI User Guide

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Switch back to the original workload site: concurrent SRDF/Star

About this task

When the original workload site returns to normal operations, switch back to the original workload site to reestablish the original SRDF/Star configuration.

To switch back to the original workload site:

  • You must be able to completely synchronize the data at all three sites.
  • The current workload site's SRDF links must be connected to the other two sites.

The states that allow switching back to the original workload site vary depending on whether the workload was switched to the synchronous target site or the asynchronous target site:

  • When switched to the synchronous target site, one of the following states is required to switch back:
    • STAR Protected
    • Both target sites are Protected and Star is Unprotected
    • One target site is Protected and the other is Connected
    • Both target sites are Connected
  • When switched to the asynchronous target site, the following states are required to switch back:
    • One target site is Protected and the other is Connected.
    • Both target sites are Connected.

The following procedure assumes the original workload site is NewYork, but the workload is now running at the synchronous site NewJersey. This configuration is depicted in Figure 4.

Steps

  1. Stop the workload at the site where the Star control host is connected.
  2. Issue the halt command from the Star control host where the workload is running.

    To halt SRDF from the NewJersey Star control host: 

    symstar -cg StarGrp halt

    The halt action:

    • Disables the R1 devices,
    • Waits for all invalid tracks and cycles to drain,
    • Suspends the SRDF links,
    • Disables SRDF consistency protection, and
    • Sets the STAR indicators.

    The target sites transition to the Halted state, and all the data on all three sites is the same.

  3. Run the following commands from the Star control host at the original site of the workload (NewYork): 
    symstar -cg StarGrp switch -site NewYork
symstar -cg StarGrp connect -site NewJersey
symstar -cg StarGrp connect -site London
symstar -cg StarGrp protect -site NewJersey
symstar -cg StarGrp protect -site London
symstar -cg StarGrp enable
    • The workload is switched to NewYork, and
    • NewYork is (synchronously) connected to NewJersey.
    • NewYork is (asynchronously) connected to London.
    • The state is STAR Protected.

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