You can recover from a failure if only one volume capacity in a GAD pair can be expanded, while a failure occurs on the other volume before the expansion.
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Start to recover from the failure using one of the global-active device disaster recovery procedures.
Depending on the operations during the recovery procedure, one or more of the following actions are required:
- If the operation is resynchronizing a GAD pair
The resynch operation cannot be performed because the capacity of the P-VOL and S-VOL in the GAD pair is not the same.
Complete Steps 2 and 3 before the GAD pair resynch operation.
- If the operation is,
- Deleting a GAD pair
- Recovering from a volume failure
- Re-creating a GAD pair
The GAD pair cannot be created because the capacity of the target P-VOL and S-VOL is not the same when re-creating the GAD pair.
Complete Steps 2 and 3 before the GAD pair resynch operation.
- If the operation is,
- Deleting a GAD pair
- Deleting a volume
- Creating a volume
- Re-creating a GAD pair
The GAD pair cannot be created because the capacity of the target P-VOL and S-VOL is not the same when re-creating the GAD pair. Make sure that the capacity of the P-VOL and S-VOL is the same when creating the volumes.
Skip Steps 2 and 3.
- If the operation is resynchronizing a GAD pair
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Expand the capacity of volumes whose capacity is not expanded, and then make
sure that the capacity of the P-VOL and S-VOL in the GAD pair is the
same.
When a GAD pair is used with other software, the capacity of the P-VOLs and S-VOLs in all of the used software products must be expanded. For more information about the order in which the volume capacity is expanded, see Expansion order policy when GAD pair shares the same volumes with other software
- Restart the resync operation and the creation of the GAD pair by following one of the global-active device disaster recovery procedures.