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.
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.