Step 3: Select synchronization settings

Select the settings that determine how data is synchronized after a communication interruption.

You can set the priority at which the controller owner of the primary volume resynchronizes data with the secondary volume after a communication interruption. You must also select the resynchronization policy, either manual or automatic.
  1. Use the slider bar to set the synchronization priority.

    The synchronization priority determines how much of the system resources are used to complete initial synchronization and the resynchronization operation after a communication interruption as compared to service I/O requests.

    The priority set on this dialog applies to both the primary volume and the secondary volume. You can modify the rate on the primary volume at a later time by going to System Manager and selecting Storage > Synchronous Mirroring > More > Edit Settings.

    There are five synchronization priority rates:

    • Lowest
    • Low
    • Medium
    • High
    • Highest
  2. Choose whether you want to resynchronize the mirrored pairs on the remote storage array either manually or automatically.
    • Manual (the recommended option) – Select this option to require synchronization to be manually resumed after communication is restored to a mirrored pair. This option provides the best opportunity for recovering data.
    • Automatic – Select this option to start resynchronization automatically after communication is restored to a mirrored pair.

    To manually resume synchronization, go to System Manager and select Storage > Synchronous Mirroring, highlight the mirrored pair in the table, and select Resume under More.

  3. Click Finish to complete the synchronous mirroring sequence.

Once mirroring is activated, the system performs the following actions:

Go to System Manager and select Home > View Operations in Progress to view the progress of the synchronous mirroring operation. This operation can be lengthy and could affect system performance.