You can use System Manager to reestablish a mirror relationship that was previously broken. In a reverse resynchronization operation, you reverse the functions of the source volume and destination volume.
The source volume must be online.
If the volume expiry time is in the past or has not been set, then the Snapshot copy and the common Snapshot copy are locked for a duration of 30 days. All of the intermediate Snapshot copies between the common Snapshot copy and the latest locked Snapshot copy are deleted.