System, method and computer readable medium for effieicnt snapshot-based mirroring operations

摘要

A storage system that may include a management module, a communication module and a storage module; wherein the management module is arranged to receive, at an intermediate point in time that occurs between the first point in time and a second point in time, a first request that indicates that a certain extent of the second logical volume is irrelevant; participate in a creation of second point in time snapshots of the first and second logical volumes; select, in response to the first request, out of all data deltas generated between the first and second point in time, selected data deltas to be transmitted to the other storage system; wherein the selected data deltas exclude data deltas associated with the certain extent that were generated between the first point in time and the intermediate point in time.

主权项

1. A storage system that comprises a management module, a communication module and a storage module;
wherein the storage system is arranged to create first point in time snapshots of first and second logical volumes; wherein the communication module is arranged to transmit data deltas associated with the first point in time snapshots to another storage system; wherein the other storage system is managed by another management module; wherein the management module is arranged to:
receive, at an intermediate point in time that occurs between the first point in time and a second point in time, a first request that indicates that a certain extent of the second logical volume is irrelevant;participate in a creation of second point in time snapshots of the first and second logical volumes;select, in response to the first request, out of all data deltas generated between the first and second point in time, selected data deltas to be transmitted to the other storage system; wherein the selected data deltas exclude data deltas associated with the certain extent that were generated between the first point in time and the intermediate point in time; wherein the communication module is further arranged to:
transmit the selected data deltas to the other storage system; andtransmit to the other management module a second request that indicates that a content, before the intermediate point in time, of the certain extent of the second logical volume is irrelevant for a creation of a mirror copy of the second logical volume at the other storage system.