From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Dilger Date: Thu, 18 Oct 2001 15:11:44 -0600 Subject: Re: [linux-lvm] snapshots Message-ID: <20011018151144.N1144@turbolinux.com> References: Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-lvm@sistina.com 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