Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 18 Jul 2002 11:07:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 18 Jul 2002 11:06:59 -0400 Received: from garrincha.netbank.com.br ([200.203.199.88]:21253 "HELO garrincha.netbank.com.br") by vger.kernel.org with SMTP id ; Thu, 18 Jul 2002 11:06:56 -0400 Date: Thu, 18 Jul 2002 12:09:40 -0300 (BRT) From: Rik van Riel X-X-Sender: riel@imladris.surriel.com To: Bill Davidsen cc: Andreas Dilger , Subject: Re: [ANNOUNCE] Ext3 vs Reiserfs benchmarks In-Reply-To: Message-ID: X-spambait: aardvark@kernelnewbies.org X-spammeplease: aardvark@nl.linux.org MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 951 Lines: 27 On Thu, 18 Jul 2002, Bill Davidsen wrote: > I think I'm missing a part of this, the "a snapshot is created" sounds a > lot like "here a miracle occurs." Where is this snapshot saved? And how > do you take it in one sec regardless of f/s size? LVM. Systems like LVM already provide a logical->physical block mapping on disk, so they might as well provide multiple mappings. If the live filesystem writes to a particular disk block, the snapshot will keep referencing the old blocks while the filesystem gets to work on its own data. Copy on Write snapshots for block devices... regards, Rik -- Bravely reimplemented by the knights who say "NIH". http://www.surriel.com/ http://distro.conectiva.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/