Asynchronous detection of local event based point-in-time...

Details Asynchronous detection of local event based point-in-time... Asynchronous detection of local event based point-in-time...

2005-03-30

2011-12-27

Cottingham, John R. (Department: 2167)

Data processing: database and file management or data structures

File or database maintenance

Synchronization

C707S654000, C707S668000

Reexamination Certificate

active

08086569

ABSTRACT:
A storage system executes a delta set asynchronous remote replication protocol, wherein writes to a local copy are aggregated into delta sets during successive delta cycles. The delta sets are sent to a remote storage system to be written to a remote copy. Independent of the delta cycles, the local storage system receives a signal representing an external event. In response to receiving the signal, all writes just prior to and in accordance with the external event are posted to the local copy, the current delta set is ended, and a marker delta set is inserted in the delta set stream. The delta sets received at the remote storage system are monitored for the marker delta set. When the marker delta set is received, it is indicated that the remote copy is consistent with the local copy just prior to the external event at the local storage system.

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