[linux-lvm] snapshots

[Andreas Dilger]

On Oct 18, 2001  16:35 -0400, Robert Dyas wrote:
> 1)Has anyone had any luck creating a snapshot (lvcreate -L100M -s -n backup
> /dev/vg_master/lv_home) and then mounting it (mount -r /dev/vg_master/backup
> /mnt)? If so, what version of the kernel, mount tools, filesystem, etc are
> you using?

Yes, but I don't know the exact versions.

> 2) How can you use the snapshot feature to facilitate incremental or
> differential backups? Wouldn't the dump or other backup program have to
> twiddle the archive bit, but won't be able to since snapshots are readonly?

Um, "archive bit" is a severe DOS-ism, which doesn't exist in Unix.  An
incremental backup on Unix is based on the file modification timestamp
which does not need to be changed when doing the backup.

Cheers, Andreas
--
Andreas Dilger  \ "If a man ate a pound of pasta and a pound of antipasto,
                 \  would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/               -- Dogbert