Resynchronizing the pairs in a mirror

When you resynchronize a mirror, all of the pairs with the mirror ID are resynchronized, and update data copy to the S-VOL is resumed. Delta resync is performed while resynchronizing mirrors. When resynchronizing mirrors to perform the delta resync operation in a delta resync configuration, see Conditions for delta resync operations, and make sure all conditions for delta resync are met.

If you use UR with GAD, it is not necessary to resynchronize mirrors when you perform delta resync. For details, see the Global-Active Device User Guide.

Prerequisites

• This operation can be performed only from the primary system.

• Mirror status must be Stopped, Hold, Holding, or Hold(Failure).

• Resynchronizing a mirror when I/O load is low reduces impact on performance. In a configuration where pairs with different statuses are mixed in the same consistency group, if mirrors are resynchronized when I/O load is high, operation might be suspended.

Procedure

1. Open the Remote Replication window.

In Command Suite: On the Resources tab, expand the Storage Systems tree, right-click the target storage system, and click Remote Replication.

In Device Manager - Storage Navigator: In the Storage Systems tree, click Replication > Remote Replication.

2. Select the Mirrors tab, and then select the mirrors to be resynchronized.

3. From the Actions menu, click Remote Replication > Resync Mirrors.

4. In the Resync Mirrors window, review the mirrors in the Selected Mirrors table. You can remove a mirror from the table by selecting it and clicking Cancel.

5. Click Finish.

6. In the Confirm window, review the settings and enter a task name in the Task Name box.

7. Click Apply to save your settings to the system.