Tracking in-progress writes through use of multi-column bitmaps

Details Tracking in-progress writes through use of multi-column bitmaps Tracking in-progress writes through use of multi-column bitmaps

2005-06-14

2005-06-14

Lane, Jack A. (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S156000, C707S793000, C714S006130

Reexamination Certificate

active

06907507

ABSTRACT:
Disclosed is a method and apparatus for tracking in-progress writes to a data volume and a copy thereof using a multi-column bit map. The method can be implemented in a computer system and, in one embodiment, includes creating a data volume in a first memory, and creating a copy of the data volume in a second memory. In response to the computer system receiving a request to write first data to the data volume, the computer system switches the state of first and second bits of a map entry in a memory device, wherein the state of the first and second bits are switched using a single write access to the memory device.

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