Snapshot rollback for synchronous replication

A system for performing rollback of a snapshot between a source storage system and a target storage system in a synchronous replication session, the system comprising:

• a memory comprising computer-executable instructions;
• and
• a processor operable by a storage system, the processor executing the computer-executable instructions, the computer-executable instructions when executed by the processor cause the processor to perform operations comprising:
• during the synchronous replication session:
• reassigning a current replication source volume to a rollback source snapshot, the rollback source snapshot generated for a consistency group that comprises a plurality of volumes;
• performing, for one or more snapshot trees maintained for the consistency group, a differential scan between a child of the rollback source snapshot and the current replication source volume, the differential scan being based on a determination of whether a first node corresponding to a previous snapshot is an ancestor of a second node corresponding to the replication source volume;
• calculating, from results of the differential scan, a dirty tree differential;
• and
• for each difference identified in the dirty tree differential:
• calculating a corresponding volume offset;
• and
• initiating a copy command for the current replication source volume and the rollback source snapshot, the copy command translated to a remote metadata copy request in a synchronous replication data transfer, wherein execution of the copy command for each difference in the dirty tree differential results in the target storage system containing matching content as the source storage system after the rollback.

A computer program product for performing rollback of a snapshot between a source storage system and a target storage system in a synchronous replication session, the computer program product embodied on a non-transitory computer readable medium, the computer program product including instructions that, when executed by a computer, causes the computer to perform operations comprising:

• during the synchronous replication session:
• reassigning a current replication source volume to a rollback source snapshot, the rollback source snapshot generated for a consistency group that comprises a plurality of volumes;
• performing, for one or more snapshot trees maintained for the consistency group, a differential scan between a child of the rollback source snapshot and the current replication source volume, the differential scan being based on a determination of whether a first node corresponding to a previous snapshot is an ancestor of a second node corresponding to the replication source volume;
• calculating, from results of the differential scan, a dirty tree differential;
• and
• for each difference identified in the dirty tree differential:
• calculating a corresponding volume offset;
• and
• initiating a copy command for the current replication source volume and the rollback source snapshot, the copy command translated to a remote metadata copy request in a synchronous replication data transfer, wherein execution of the copy command for each difference in the dirty tree differential results in the target storage system containing matching content as the source storage system after the rollback.