From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1AiHgk-0003TA-Gr for user-mode-linux-devel@lists.sourceforge.net; Sun, 18 Jan 2004 10:30:22 -0800 Received: from smtp003.mail.ukl.yahoo.com ([217.12.11.34]) by sc8-sf-mx2.sourceforge.net with smtp (Exim 4.30) id 1AiHgj-00037e-TY for user-mode-linux-devel@lists.sourceforge.net; Sun, 18 Jan 2004 10:30:22 -0800 From: BlaisorBlade Subject: Re: [uml-devel] Dynamic remount with variable COW stacking/merging needed, support for snapshot repilication References: <4009A583.7070007@lig.net> In-Reply-To: <4009A583.7070007@lig.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200401181204.04061.blaisorblade_spam@yahoo.it> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Sun, 18 Jan 2004 12:04:04 +0100 To: user-mode-linux-devel@lists.sourceforge.net Alle 22:13, sabato 17 gennaio 2004, Stephen D. Williams ha scritto: > When a UML instance is running a always-on service, such as a web > server, an administrator needs to be able to make live backups, or > replications, of a running system. > > This can be done using LVM snapshots, although that is not always > appropriate for just this feature. A UML instance can be paused and then > restarted, but this can cause severe delays while large partitions are > replicated. In general, this should be done with LVM. There is a strong idea that COW is somehow a duplication of LVM, and I read that Jeff Dike (IIRC) wanted it to be rewritten as a new snapshot format for LVM (the reason for a different format is that LVM snapshot were built thinking to partitions, while Uml can use sparse files - which is a great advantage if you're able to use it). It's maybe harder to setup, that's true, but see about EVMS which provides a nicer interface. Bye -- cat <