Patent ID: 8086569

Claim:
A method for use in a storage system comprising: executing a delta set asynchronous remote replication protocol, wherein writes to a local copy on a local storage site are aggregated into delta sets during successive delta cycles, each delta cycle expiring after a certain duration, and wherein, after expiration of a current delta cycle, a current delta set is transmitted to a remote storage site to be written to a remote copy; receiving, at the local storage site, a signal representing an external event; in response to receiving the signal: ending the current delta cycle at the local storage site earlier than when the current delta cycle is due to expire; inserting a marker set on the local storage site after the modifications made prior to and in accordance with the external event are captured in the local copy; and transmitting the marker set to the remote storage site; and monitoring the delta sets received at the remote storage site for the marker set; and indicating that the remote copy is consistent with the local copy in response to the receipt of the marker set at the remote storage site.