Method and apparatus for separating snapshot preserved and write data
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United States of America Patent
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Jul 5, 2011
Grant Date -
Oct 16, 2008
app pub date -
Jul 19, 2007
filing date -
Apr 11, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method and device for managing snapshot data is provided. Snapshots may be created having a preserved data area and a write data area. The preserved data area is used to maintain snapshot data corresponding to the point-in-time when the snapshot was created while the write data area is used to facilitate host read/write access to the snapshot. By maintaining two separate areas, the snapshot can be written to without altering the point-in-time representation of the snapshot.
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