Symmetrical data change tracking

Details Symmetrical data change tracking Symmetrical data change tracking

2006-06-30

2009-06-23

Thomas, Shane M (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C707S793000, C707S793000

Reexamination Certificate

active

07552296

ABSTRACT:
A method, computer program product, computer system and system that enable symmetrical data change tracking with respect to a set of data and a copy of the set of data, referred to as a snapshot or a second set of data. The data and the copy may be independently updated after the two sides are “split.” A join may be performed of the two sides of the split to resynchronize the data.For the first set of data, an accumulator map tracks changes to the first set of data and a volume map tracks changes to the first set of data with respect to a second set of data. For the second set of data (the snapshot), a second accumulator map tracks changes to the second set of data and a second volume map tracks changes to the second set of data with respect to the first set of data.

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