Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161647AbXBOXCD (ORCPT ); Thu, 15 Feb 2007 18:02:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161649AbXBOXCD (ORCPT ); Thu, 15 Feb 2007 18:02:03 -0500 Received: from mail.um.es ([155.54.212.109]:45733 "EHLO mail.um.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161647AbXBOXCB (ORCPT ); Thu, 15 Feb 2007 18:02:01 -0500 Date: Thu, 15 Feb 2007 23:59:14 +0100 (CET) From: Juan Piernas Canovas X-X-Sender: piernas@ditec.inf.um.es To: =?utf-8?B?SsO2cm4=?= Engel Cc: Jan Engelhardt , sfaibish , kernel list Subject: Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation In-Reply-To: <20070215200922.GB24643@lazybastard.org> Message-ID: References: <20070215200922.GB24643@lazybastard.org> MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="916140492-36369700-1171580354=:19998" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2418 Lines: 62 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --916140492-36369700-1171580354=:19998 Content-Type: TEXT/PLAIN; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8BIT Hi J?rn, On Thu, 15 Feb 2007, [utf-8] J?rn Engel wrote: > On Thu, 15 February 2007 19:38:14 +0100, Juan Piernas Canovas wrote: >> >> The patch for 2.6.11 is not still stable enough to be released. Be patient >> ;-) > > While I don't want to discourage you, this is about the point in > development where most log structured filesystems stopped. Doing a > little web research, you will notice those todo-lists with "cleaner" > being the top item for...years! > > Getting that one to work robustly is _very_ hard work and just today > I've noticed that mine was not as robust as I would have liked to think. > Also, you may note that by updating to newer kernels, the VM writeout > policies can change and impact your cleaner. To an extent even that you > had a rock-solid filesystem with 2.6.18 and thing crumble between your > fingers in 2.6.19 or later. > > If the latter happens, most likely the VM is not to blame, it just > proved that your cleaner is still getting some corner-cases wrong and > needs more work. There goes another week of debugging. :( > > J?rn > Actually, the version of DualFS for Linux 2.4.19 implements a cleaner. In our case, the cleaner is not really a problem because there is not too much to clean (the meta-data device only contains meta-data blocks which are 5-6% of the file system blocks; you do not have to move data blocks). Anyway, thank you for warning me ;-) Regards, Juan. -- D. Juan Piernas C?novas Departamento de Ingenier?a y Tecnolog?a de Computadores Facultad de Inform?tica. Universidad de Murcia Campus de Espinardo - 30080 Murcia (SPAIN) Tel.: +34968367657 Fax: +34968364151 email: piernas@ditec.um.es PGP public key: http://pgp.rediris.es:11371/pks/lookup?search=piernas%40ditec.um.es&op=index *** Por favor, env?eme sus documentos en formato texto, HTML, PDF o PostScript :-) *** --916140492-36369700-1171580354=:19998-- - 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/