Resynchronizing or restoring SI pairs

Use this task to resynchronize or restore split or suspended pairs.

Running this command typically takes less time than resynchronizing suspended pairs ("PSUE" status). Split pairs typically contain much less accumulated differential data than the total amount of data in the P-VOL.

Prerequisites:

You can only resynchronize L2 pairs.

After performing a Quick Split, wait 20 seconds before a Normal Copy or Quick Resync resynchronization, otherwise the operation might end abnormally.

If you are using the CCI to run commands, run the following command to resynchronize split pairs ("PSUS" status):

pairresync

In Hitachi Command Suite:

On the Resources tab, click Storage Systems, expand the storage system tree, right-click the target storage system, and then select Local Replication.

In Device Manager - Storage Navigator:

In the Explorer pane, click Storage Systems, expand the storage system tree, and then click Replication > Local Replication.

Select the SI Pairs tab.

In the SI Pairs tab of the Local Replication window, select the pair you want to resynchronize and then click Resync Pairs.

In the Resync Pairs window of the Resync Pairs wizard, complete the following and then click Finish:

For Resync Type, select the type of resynchronization you want to perform.

Values:

- Normal Copy (Primary > Secondary): A full forward resynchronization.

- Quick Resync (Primary > Secondary): A partial forward resynchronization.

- Reverse Copy (Secondary > Primary): A full restoration of the P-VOL from the S-VOL.

- Quick Restore (Secondary > Primary): A partial restoration of the P-VOL from the S-VOL.

Default: Normal Copy (Primary > Secondary)

For more information about the types of SI pair resynchronization you can use, including complete descriptions of the types, see Types of pair resynchronization.

For Copy Pace, select the rate at which you want the VSP G200, G400, G600 storage system to copy data.

Values:

- Slower: Improved host server I/O performance but slower processing speed.

- Medium: Average processing speed and host server I/O performance.

- Faster: Faster processing speed but slower host server I/O performance.

Default: Medium

The pace you select affects processing speed and host server I/O performance

In the Confirm window of the Resync Pairs wizard, complete the following and then click Apply. The setting is queued as a task and performed in order.

For Task Name, type a name for the task.

Default: date-window name

Character and symbol limit: 32 alphanumeric except / : , ; * ? “ < > |

Case sensitive: Yes

For Go to tasks window for status, select to open the Tasks window.

Open the Tasks window to verify the result of the operation. A task can be suspended or canceled if the processing of the task is not started.

The pairs are resynchronized and the volumes are paired ("PAIR" status).

If you are reverse resynchronizing and the task ends abnormally, the pair is suspended ("PSUE" status).

For more information about the "PSUE" status, see HDvM - SN pair status names and descriptions.