System and method for determining changes in two snapshots and for transmitting changes to a destination snapshot
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United States of America Patent
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Oct 19, 2010
Issued Date -
N/A
app pub date -
Sep 2, 2009
filing date -
Mar 19, 2002
priority date (Note) -
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Abstract
A method for backing up a computer file system is disclosed. A first snapshot of the file system is generated at a first time, the first snapshot having first pointers to data blocks of the file system at the first time. A network adapter receives storage operations to write new data to the file system. A second snapshot of the file system is generated at a second time, the second snapshot having second pointers to data blocks of the file system at the second time, the data blocks at the second time including the new data. The first pointers to the second pointers are compared. In response to the second pointers differing from the first pointers, data of the file system which have been changed between the first snapshot and the second snapshot are copied to a backup copy of the file system.
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