[linux-lvm] Keep snapshots active for 24 hours?

Steve Wray steve.wray at the.net.nz
Fri Dec 14 17:05:02 UTC 2001

> From: linux-lvm-admin at sistina.com [mailto:linux-lvm-admin at sistina.com]On
> Behalf Of Andreas Dilger
> On Dec 15, 2001  10:52 +1300, Steve Wray wrote:
> > I'd been wondering if snapshotting could be used for;
> > 
> > - providing 'virtual journalling' any filesystem that happens to
> > be on a logical volume.
> It could, but you would have to make a _lot_ of snapshots for it to
> be worthwhile (i.e. one every 10-30 seconds or so).  If you want this
> for "non-journaled" filesystems, you can use the ext3 journaling code
> to add this to most any block based filesystem.  It isn't trivial,
> but at least possible.

Fair enough for snapshotting as it is today,
but maybe the underlying technology could be adapted?

> > - take a snapshot, install something or try something out
> > that might break something, then restore *directly* from
> > the snapshot if anything goes wrong; without having to actually
> > back it up to media and restore it.
> Yes, this would be clever.  I'd rather that RPM/DEB package tools just
> become smarter (like AIX LPP) where it allows you arbitrary amounts of
> back-out from updated packages (as long as you have enough disk space).
> After you have "applied" a package, you can test it out, and either
> commit it or revert to the old version.  The rpm and dpkg tools could
> just do this by checksumming any existing files from the previous install
> and only backing up those that had changed between versions.
> Cheers, Andreas
> --
> Andreas Dilger
> http://sourceforge.net/projects/ext2resize/
> http://www-mddsp.enel.ucalgary.ca/People/adilger/
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