Patent attributes
Techniques for replay of groups of I/Os for disaster recovery. At a primary site, a plurality of primary site computing entities that are to be restored from the secondary computing site after a disaster recovery event are identified as belonging to an entity group. At the primary site, I/O commands that are performed over any of the entities of the entity group are observed and streamed to the secondary site, where they are persisted into a log. Periodically, the primary site sends the secondary site an I/O map that associates a time with an indication of the last performed I/O commands pertaining to any observed I/O commands that had been performed over any one or more of the computing entities of the entity group. Upon receiving a disaster recovery request, the most recent I/O map and the secondary site log are processed to construct a snapshot for the entity group.
