Messages in this thread | | | From | Andreas Dilger <> | Date | Wed, 10 Apr 2002 12:13:04 -0600 | Subject | Re: implementing soft-updates |
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On Apr 10, 2002 11:28 +0200, Dominik Kubla wrote: > try to implement the snapshot capability for ext2/ext3. Everyone of us > who has to do live backups of production systems will thank you if you > get that development started.
LVM can already do snapshots at the device level. It integrates with ext3/XFS/reiserfs via sync_super_lockfs/unlockfs so that what is in the snapshot is a consistent, clean filesystem.
There might need to be a little touchup with ext2 to support these calls, but even in the current state you get a usable filesystem snapshot, with the exception that the filesystem has not been marked clean.
As for a filesystem-level ext2/ext3 snapshot, this has also already been done (sf.net/projects/snapfs). The people who took over that project have removed all of the released files and CVS, but you can still get the CVS from the sourceforge CVS backups. I also have a version here, but don't have any time to work on it.
Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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