Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030227AbXBZN0B (ORCPT ); Mon, 26 Feb 2007 08:26:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030225AbXBZN0B (ORCPT ); Mon, 26 Feb 2007 08:26:01 -0500 Received: from mexforward.lss.emc.com ([128.222.32.20]:11905 "EHLO mexforward.lss.emc.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030227AbXBZN0A (ORCPT ); Mon, 26 Feb 2007 08:26:00 -0500 Date: Mon, 26 Feb 2007 08:24:57 -0500 To: "Yakov Lerner" Subject: Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation From: "Sorin Faibish" Cc: "kernel list" , "piernas@ditec.um.es" Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-15 MIME-Version: 1.0 References: Content-Transfer-Encoding: 8bit Message-ID: In-Reply-To: User-Agent: Opera Mail/9.00 (Win32) X-PMX-Version: 4.7.1.128075, Antispam-Engine: 2.5.0.283055, Antispam-Data: 2007.2.26.50933 X-PerlMx-Spam: Gauge=, SPAM=0%, Reasons='EMC_BODY_1+ -3, EMC_FROM_0+ -2, __C230066_P5 0, __CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __MIME_TEXT_ONLY 0, __MIME_VERSION 0, __SANE_MSGID 0, __USER_AGENT 0' Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2501 Lines: 68 On Mon, 26 Feb 2007 06:49:05 -0500, Yakov Lerner wrote: > On 2/14/07, sfaibish wrote: >> On Sat, 10 Feb 2007 22:06:37 -0500, Sorin Faibish >> wrote: >> >> > Introducing DualFS >> > >> > File System developers played with the idea of separation of >> > meta-data from data in file systems for a while. The idea was >> > lately revived by a small group of file system enthusiasts >> > from Spain (from the little known University of Murcia) and >> > it is called DualFS. We believe that the separation idea >> > will bring to Linux file systems great value. >> > >> > We see DualFS as a next-generation journaling file system which >> > has the same consistency guaranties as traditional journaling >> > file systems but better performance characteristics. The new file >> > system puts data and meta-data on different devices (usually, two >> > partitions on the same disk or different disks) > > Do you guys have an option of using just one partiton, and > divide it into two fixed parts at mkfs-time , one part X% (for metadata) > and 2nd part at (100-X)% (file file blocks) ? From an ease-of-use perspective I agree as this could be an option but the point is to be able to manage the MD completely separate in cases when you want for example to extend the MD volumes or data volumes independently for example. It is all about different address spaces and fencing. I am not sure is good for fsck tasks. > Would not this option > be easier-to-administer choice for naive users ? From a code perspective should be possible. We could put it on a TODO list if of interest for many. It is not a matter of naive users or not. We are all naive when we use FS and are not experts in FS. > Or, you do not > view your FS as an option for naive users in the first place If we are all naive of course we want DualFS to be useful for all. We are open for proposed features and criticism from the community. It is just a mater of resources. > > Yakov > > > -- Best Regards Sorin Faibish Senior Technologist Senior Consulting Software Engineer Network Storage Group EMC? where information lives Phone: 508-435-1000 x 48545 Cellphone: 617-510-0422 Email : sfaibish@emc.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/