Snapshot creating method and apparatus
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United States of America Patent
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Aug 12, 2008
Grant Date -
Jan 11, 2007
app pub date -
Sep 13, 2006
filing date -
Nov 27, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
In the storage-based snapshot creation, a block-selection specifying unit provided on a NAS processing unit specifies a block, which becomes necessary for the generation of snapshot data, to a specified-block analyzing unit within a disk apparatus. Moreover, a disk controller generates the snapshot data on the block specified as the snapshot target, while making an inquiry to the specified-block analyzing unit. This makes it possible to create the snapshot in a storage-capacity reduced manner, and to specify the snapshot creation in a partition, file, or directory unit.
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