Workflow for managing ShadowImage pairs

During most pair user tasks, the P-VOL remains available to the host for I/O operations. You must have the Storage Administrator (Local Copy) role to perform SI pair user tasks.

Use the following workflow to complete pair user tasks:

1. Check the pair status (see Checking SI pairs).

For more information about the required status for pair user tasks, see Pair status and supported pair user tasks.

2. Create the SI pairs (see SI pair creation).

3. (Optional) Suspend the SI pair creation.

For more information about suspending SI pair creating, see Suspending SI pair creation.

4. (Optional) Suppress update copy operations during pair restoration (see Suppressing update copy operations during pair restoration).

5. Split the pairs. You can do the following:

• Split SI pairs (see Splitting SI pairs).

• Split SI pairs in a CTG.

6. Resynchronize or restore the SI pairs (see Resynchronizing or restoring SI pairs).

7. (Optional) If you have performed a Quick Resync on the pair ("PAIR" status), suppress copy processing (see Suppressing update copy operations during pair restoration).

8. Delete the SI pairs, which ends the pair relationship between the pair volumes (see Deleting SI pairs).

In ShadowImage, it might take a lot of time before a copy operation starts. This is because before a copy operation starts, differential tables are initialized for the relevant pairs, one pair after another, within the system. Especially when the pairs use a large volume of data, initialization can be a very long process.

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