Method and system for reducing the number of read-only, persistent point-in-time images on a storage server
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United States of America Patent
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May 25, 2010
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app pub date -
Jan 12, 2006
filing date -
Jan 12, 2006
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Abstract
A plurality of read-only, persistent point-in-time images (RPPIs) of a file system are maintained on a storage server. Each of these RPPIs is created to capture an update of the file system. The file system has at least one subset. If, for each subset of the file system, the file system has an RPPI, other than a first RPPI, having a corresponding subset identical to the first RPPI's corresponding subset, the first RPPI may be deleted, yet all updates captured by the first RPPI are still maintained by other RPPI or RPPIs.
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