From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heinz Mauelshagen Message-Id: <200003080812.JAA11917@u9etz.ez-darmstadt.telekom.de> Subject: Re: [linux-lvm] Snapshot documentation Date: Wed, 8 Mar 2000 09:12:51 +0100 (MET) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-lvm Errors-To: owner-linux-lvm List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@msede.com Enabling you to create snapshots with less space than that of the Original Logical Volume is an option to save space in case you have data which doesn't change a lot. The only chance to deal with for eg. a filesystem which changes rapidly and in the extrem case totally is to create equal sized snapshots. Heinz > Hi, > > Been playing with snapshots and am noticing I can create a snapshot with > less PE's than my source LV that I'm snapshotting, with the small side > effect of: > > lvcreate -- WARNING: all snapshots will be disabled if more than 12 MB are > changed > > Is the above message implying that if I change more than 12MB of data on > my source LV that the snapshot is then defunct/useless? Does that include > deletes, etc? > > Mainly a pointer to any information or documentation regarding how this > all works would be well appreciated. I'm noticing LVM has some HP history > involved, so I'll go see if they have relevant data in their HPUX docs. > > Maybe this is included in the recent EN-HOWTO I noticed mention of as > well? > -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Systemmanagement CS-TS T-Nova Entwicklungszentrum Darmstadt Heinz Mauelshagen Otto-Roehm-Strasse 71c Senior Systems Engineer Postfach 10 05 41 64205 Darmstadt mge@EZ-Darmstadt.Telekom.de Germany +49 6151 886-425 FAX-386 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-