Deleting GAD pairs
If a GAD pair does not need to be maintained any longer, delete the GAD pairs. When the GAD pair is deleted, all the copy operations for that pair stops and the primary and secondary volumes change to single volumes, and the volumes or its data will not be deleted.
When you delete a GAD pair by specifying the primary volume, the virtual LDEV ID of the secondary volume is deleted. If you continue business on the primary volume after deleting the GAD pair, delete the GAD pair by specifying the primary volume. You can delete a GAD pair by specifying the primary volume only when the pair status of the primary volume is PSUS or PSUE, and the I/O mode is Local.
When you delete a GAD pair by specifying the secondary volume, the virtual LDEV ID of the primary volume is deleted. If you continue business on the secondary volume after deleting the GAD pair, delete the GAD pair by specifying the secondary volume. You can delete a GAD pair by specifying the secondary volume when the pair status of the secondary volume is SSWS and the I/O mode is Local.
There are three methods for deleting a pair:
- Normal deletion:
To delete GAD pairs normally, delete the GAD pairs from the storage system at the primary site.
- Forced deletion for paired volumes:
Used when the I/O mode of both the primary and secondary volumes is Blocked.
- Forced deletion for nonpaired volumes:
Used when the volumes are not paired but pair information remains in the volumes.
If you want to re-create a GAD pair using a volume that was deleted from a pair, re-create the GAD pair from the storage system with the volume that was specified when you deleted the GAD pair. For example, if you delete a GAD pair by specifying the P-VOL, re-create the GAD pair from the primary storage system. If you delete a GAD pair by specifying the S-VOL, re-create the GAD pair from the secondary storage system.