Practice recovery to H1 with production that is continuing on H2

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In this scenario, your goal is to practice a recovery to H1 with production that is continuing on H2.

About this task

Follow these steps to carry out this scenario

Procedure for Multi-Target Metro Mirror - Global Mirror session type

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Procedure

  1. Start H2->H1 H2->H3

    Issue this command to begin the multi-target replication on your system when the production I/O is running on H1. Wait for the session to go to the prepared state.

  2. Suspend H2H1

    This command creates the planned outage by suspending the Metro Mirror relationship between H2 and H1. When this step is complete, the session state should be Suspended (Partial) and recoverable.

  3. FailoverH1

    This command makes H2 target-available.

    Note: Production I/O can continue to run to H2. Replication will continue to run from H2 to H3.
  4. Start H2->H1 H2->H3

    When you complete testing on H1, you can issue the Start H2->H1 H2->H3 command to return to multi-target without completing a full copy.

Procedure for Cascaded Metro Global Mirror session type

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Procedure

  1. Start H2->H1->H3

    This command starts a Metro Global Mirror session with H1 and H2 roles reversed from the original configuration.

    You can continue to run production I/O to H2 for the next two steps.

  2. Suspend

    This command creates the planned outage by suspending the Metro Mirror relationship between H1 and H2. When this step is complete, the session should be suspended and recoverable.

  3. Recover H1

    This command makes H1 target-available. When the session state is target-available at H1, run practice I/O to H1.

  4. Start H2->H3

    Issue this command to ensure that any I/O that is written to site 2 is copied to site 3.

    You can also use the Start H2->H3 command to practice for a disaster at the H1 site while still maintaining disaster recovery capability. When the H2->H3 role pair is in Global Mirror mode, you can recover the session at site 3 if a disaster occurs.

    When you complete testing on H1, you can issue the Start H2->H1->H3 command to return to a three-site configuration without completing a full copy.

  5. Start H2->H1->H3

    Issue this command to restart the Metro Global Mirror session in the H2-H1-H3 configuration. Any changes from production at the local site (H2) flow from the remote site (H3) to the intermediate site (H1), which overwrites the test data on H1.