Writable virtual disk of read-only snapshot file objects
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United States of America Patent
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Nov 25, 2008
Grant Date -
Aug 10, 2006
app pub date -
Apr 11, 2003
filing date -
Apr 11, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A technique enables creation and use of a writable, read-only snapshot of an active file system operating on a storage system, such as a multi-protocol storage appliance. The writable, read-only snapshot comprises a read-only 'image' (file) residing in a snapshot and a writable virtual disk (vdisk) residing in the active file system. The writable vdisk is a 'shadow' image of the snapshot file image and, as such, includes an attribute that specifies the snapshot file as a backing store.
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