Tracking in-progress writes through use of multi-column bitmaps
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United States of America Patent
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Jun 14, 2005
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app pub date -
Dec 19, 2002
filing date -
Dec 19, 2002
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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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