System and method for restoring a virtual disk from a snapshot
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United States of America Patent
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Jun 22, 2010
Grant Date -
Oct 26, 2006
app pub date -
Jun 7, 2006
filing date -
Aug 9, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for restoring a virtual disk (vdisk) in an active file system to an earlier time is described. Pointers pointing to data represented by the virtual disk are maintained. The pointers are saved to persistent storage at the earlier time. A pointer at a later time is compared with the pointers saved at the earlier time. If the pointer from the later time matches the pointer saved at the earlier time, the pointer from the later time is kept in the active file system. If the pointer from the later time does not match the pointers saved at the earlier time, a set of pointers associated with the pointer saved at the earlier time is copied to the active file system.
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