Splitting a mirror

A mirror normally has multiple pairs with the same master and restore journals groups. When you split a mirror, you split all the pairs in the mirror. As with a normal pair split, data copying is suspended between primary and secondary journals.

Before you begin

• A mirror can be split from the primary or secondary storage system.

• Pair status must be Active.

Procedure

1. Open the Remote Replication window:

In Command Suite:

1. On the Resources tab, expand the Storage Systems tree.

2. Right-click the target storage system, and click Remote Replication.

In Device Manager - Storage Navigator:

1. In the Explorer pane, expand the Storage Systems tree.

2. Expand the target storage system tree, expand Replication, and click Remote Replication.

2. On the Mirrors tab, select the mirrors to be split and click Split Mirrors.

3. In the Split Mirrors window, review the mirrors that you selected in the Selected Mirrors table. To remove a mirror, select it and click Cancel.

4. For Secondary Volume Write, specify whether data can be written to S-VOLs in the mirror while it is split.

• Enable: The host can write data to S-VOLs in the mirror. Available only when the selected mirror’s Attribute is Master. If Restore, Disable is used automatically.

• Disable: The host cannot write data to S-VOLs in the mirror.

5. For Split Mode, specify whether data is written to S-VOLs in the mirror before the split operation runs.

• Flush: Copies all update data from to S-VOLs in the mirror before the split.

• Purge: Prevents update data from being copied to S-VOLs in the mirror before the split. Uncopied data is copied to the S-VOL when the pair is resynchronized.

6. Click Finish.

7. In the Confirm window, review the settings, enter a task name, and then click Apply.