You delete a TrueCopy pair when you no longer need an up-to-date remote copy of the data or if you are recovering data from a disaster.
Deleting a TrueCopy pair deletes the TC relationship, but not the volumes or their data. The following happens when you delete a TrueCopy pair:
- When it is no longer necessary to maintain a remote copy of the P-VOL, delete a pair from the primary system only. All update operations are stopped and pair status for both the P-VOL and S-VOL changes to unpaired.
When a pair is deleted, the primary system continues to accept write I/O to the former P-VOL but does not keep track of the updates.
- Delete a pair from the secondary system only for disaster recovery purposes. When you do this, the secondary system changes the S-VOL pair status to unpaired, the primary system detects that the S-VOL status is unpaired and then changes the P-VOL status to PSUS (Delete pair to RCU).
To restart a pair that was deleted from the secondary system, you must delete the pair from the primary system and then create the pair from the primary system using the raidcom add remote_copy_pair command.
Note: When you delete a pair from the secondary system, make sure that the S-VOL and P-VOL are identical, including the volume labels. Take all necessary steps to prevent system problems due to duplicate volumes.
Delete the TC pair using the CCI pairsplit -S command.