Abstract: A data storage system receives sets of the revisions such that each set of revisions changes the dataset from one consistent state to another. Each set of revisions is processed in a write-selected phase followed by a read-selected phase. In the write-selected phase, the revisions in each set are written to a buffer and processed to produce a directory of the set of revisions. In the read-selected phase, the revisions are read from the buffer and integrated into the dataset. When one set of revisions is in the read-selected phase, the next set of revisions is in the write-selected phase.
Type:
Grant
Filed:
September 26, 2000
Date of Patent:
November 23, 2004
Assignee:
EMC Corporation
Inventors:
Sudhir Srinivasan, Uresh Vahalia, Uday K. Gupta, Philippe Armangau