Planned outage of remote (H3 GM target) and restarting

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In this scenario, the remote site H3 has a planned outage, or consistency groups from the Global Mirror session need to be temporarily paused. Procedures are shown for both the multi-target Metro Mirror - Global Mirror session type as well as the Metro Global Mirror cascaded session type.

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 H1->H2 H1->H3

    Issue this command to begin replication to Site 2 and Site 3 when the production I/O is running on H1. After the session is in a Prepared state, both sites 2 and 3 will have a consistent copy of the data.

    Note: Production I/O to H1 can continue during the following steps.
  2. Suspend H1->H3

    Issue this command to suspend only the Global Mirror portion of the session. The Metro Mirror continues between H1 and H2. This causes the session state to be put into a Suspended (Partial) state. Production I/O can continue to Site 1.

  3. Failover H3

    This command is optional and can be performed if Site 3 is still accessible. It will failover the relationships between Site 1 and Site 3 so that the volumes at Site 3 will allow writes. Production I/O can continue on H1. Testing can be done on the volumes at Site 3 without affecting production. When ready to return to a full three site configuration continue to the next step.

  4. Start H1->H2 H1->H3

    This command restores the original configuration by restarting the Global Mirror portion of the session.

Procedure for Cascaded Metro Global Mirror session type

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Procedure

  1. Start H1->H2->H3

    Issue this command to begin Metro Global Mirror on your system when the production I/O is running on H1. After the session is in a Prepared state, both sites 2 and 3 will have a consistent copy of the data.

    Note: Production I/O to H1 can continue during the following steps.
  2. Suspend H2->H3

    Issue this command to suspend only the Global Mirror portion of the session. The Metro Mirror continues between H1 and H2. This causes the session state to be put into a SuspendedH2H3 state.

  3. Start H1->H2->H3

    This command restores the original configuration by restarting the Global Mirror portion of the session.