compare COW files
If I make a cow copy of a file, is there a way find out whether either copy has changed? Specifically, I'm looking for a way to figure out which files have changed since a snapshot was taken, short of traditional and time-consuming file comparisons. It could have some interesting possibilities for monitoring and backup, to be able to quickly compare against a reference snapshot to find changes.
Quoted 9 lines · On Monday 20 October 2008 20:25:52 calin wrote:
If I make a cow copy of a file, is there a way find out whether either copy has changed? Specifically, I'm looking for a way to figure out which files have changed since a snapshot was taken, short of traditional and time-consuming file comparisons. It could have some interesting possibilities for monitoring and backup, to be able to quickly compare against a reference snapshot to find changes. --
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I'm also very interested in this, for incremental backups. I use rdiff-backup currently, and being able to do this would likely give an impressive speed boost.
-- Josh
Signature · 4 lines
Joshua J. Berry
"I haven't lost my mind -- it's backed up on tape somewhere."
-- /usr/games/fortune2008/10/21 calin <[email protected]>:
Quoted 1 line
If I make a cow copy of a file, is there a way find out whether either copy has changed? Specifically, I'm looking for a way to figure out which files have changed since a snapshot was taken, short of traditional and time-consuming file comparisons. It could have some interesting possibilities for monitoring and backup, to be able to quickly compare against a reference snapshot to find changes.
Btrfs disk format already supports this. We will implement this in the near future.
Regards
Yan Zheng