Splitting SI pairs

Prerequisites:

• The pair status must be one of the following:

• If you are splitting an existing pair, the pair status must be "PAIR".

• If you are creating and then immediately splitting an L1 pair, the volumes are unpaired (SMPL).

• If you want to split an L1 pair that has L2 pairs, see L1, L2 pair status and supported pair user tasks.

• If you are splitting, or creating and immediately splitting, an L2 pair, the status of the L1 pair must be "PSUS".

• If you are concerned with host server I/O performance, check to make sure the I/O load is light.

Procedure

1. In Command Suite:

1. 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:

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

2. Select the SI Pairs tab.

3. In the SI Pairs tab, select the pair you want to split, and then click Split Pairs.

4. In the Split Pairs window of the Split Pairs wizard, complete the following and then click Finish:

• For Split Type, select the split type.

Values:

- Quick Split: Splits the new pair and then copies the data so that the S-VOL is immediately available for read and write I/O. The storage system copies the remaining differential data to the S-VOL in the background.

- Steady Split: Copies the differential data to the S-VOL and then splits the new pair.

Default: Quick Split

For more information about the methods you can use to split pairs, see Pair splitting methods.

• For Copy Pace, select the rate at which you want the 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

 Processing speed and host server I/O performance are affected by the pace you select.

5. In the Confirm window of the Split 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.

The SI pair is split and the pair status changes from "PSUS(SP)/PSUS" or "COPY(SP)/COPY" to "PSUS". The snapshot data is consistent with the P-VOL data and is ready to use in SI pair user tasks.

6. 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.

Related topics

• Pair splitting methods.

• HDvM - SN pair status names and descriptions.

• L1, L2 pair status and supported pair user tasks