GAD+UR pair migration workflow

Create a target GAD+UR pair

1. Create a GAD pair by specifying the P-VOL of the source GAD pair as the P-VOL of the temporary GAD pair used for migration.
2. Create a GAD pair by specifying the S-VOL of the temporary GAD pair used for migration as the P-VOL of the target GAD pair.
3. Create a UR delta resync pair by specifying the S-VOL of the target GAD pair as the P-VOL of the target UR delta resync pair.
4. Create a UR pair by specifying the P-VOL of the target GAD pair as the P-VOL of the target UR pair and by specifying the S-VOL of the target UR delta resync pair as the S-VOL of the target UR pair.

Move operations to the target environment and delete the source environment

1. Stop I/Os to the S-VOL of the source GAD pair.
2. Suspend the source GAD pair by specifying the P-VOL.
3. Wait until the pair status of the temporary GAD pair used for migration becomes PAIR.
4. Start I/Os to the S-VOL of the temporary GAD pair used for migration.
5. Stop I/Os to the P-VOL of the temporary GAD pair used for migration.
6. Swap suspend the GAD pair by specifying the S-VOL of the temporary GAD pair used for migration.
7. Wait until the pair status of the target GAD pair becomes PAIR.
8. Wait until the pair status of the target UR pair becomes PAIR.
9. Start I/Os to the S-VOL of the target GAD pair.
10. Delete the source UR delta resync pair.
11. Delete the source UR pair.
12. Delete the source GAD pair.
13. Delete the temporary GAD pair used for migration by specifying the S-VOL.