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From: Andreas Dilger <adilger@clusterfs.com>
Date: Wed, 10 Apr 2002 12:13:04 -0600
To: Dominik Kubla <kubla@sciobyte.de>
Cc: "Albert D. Cahalan" <acahalan@cs.uml.edu>,
        "Alexis S. L. Carvalho" <alexis@cecm.usp.br>,
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Subject: Re: implementing soft-updates
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	"Albert D. Cahalan" <acahalan@cs.uml.edu>,
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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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