File system image transfer
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United States of America Patent
Stats
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Aug 5, 2003
Grant Date -
Nov 22, 2001
app pub date -
Jul 31, 1998
filing date -
Jul 31, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention provides a method and system for duplicating all or part of a file system while maintaining consistent copies of the file system. The file server maintains a set of snapshots, each indicating a set of storage blocks making up a consistent copy of the file system as it was at a known time. Each snapshot can be used for a purpose other than maintaining the coherency of the file system, such as duplicating or transferring a backup copy of the file system to a destination storage medium. In a preferred embodiment, the snapshots can be manipulated to identify sets of storage blocks in the file system for incremental backup or copying, or to provide a file system backup that is both complete and relatively inexpensive.
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