System and method for managing data versions in a file system
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United States of America Patent
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Apr 27, 2010
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N/A
app pub date -
Dec 9, 2004
filing date -
Dec 9, 2004
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Abstract
A system and method manages data versions in a file system. A data version field associated with a direct block pointer in each level 1 indirect block stores a data version associated with the data contained in the direct block. When data is modified subsequent to the creation of a persistent consistency point image, the data version is incremented to a next data version value to signify that the data has been modified. Replication is aided by the ease of identifying modified data blocks by examining the data version field associated with each block.
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