Patent attributes
An aspect of performing rollback of a snapshot between source and target storage systems in an asynchronous replication session in which Sr′ represents a remote snapshot subject to the rollback includes suspending host input/output operations to a current source volume (Vs), determining whether a snapshot (Sr) matching the snapshot Sr′ is present in the source system and, upon determining the snapshot Sr is not present in the source storage system, searching a snapshot pair (Sk, Sk′) that is closest to the remote snapshot Sr′. An aspect also includes upon determining the pair Sk, Sk′ is present in existing snapsets, performing a local rollback of the Vs to Sk, and performing remote rollback including applying a difference between Sk′ and Sr′ to the Vs via one of a snapshot differential bitmap from the target storage system between Sk′ and Sr′ for the Vs, and an internal reverse direction asynchronous replication cycle.
