From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750950AbWBZV1U (ORCPT ); Sun, 26 Feb 2006 16:27:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751230AbWBZV1U (ORCPT ); Sun, 26 Feb 2006 16:27:20 -0500 Received: from watts.utsl.gen.nz ([202.78.240.73]:28071 "EHLO mail.utsl.gen.nz") by vger.kernel.org with ESMTP id S1750940AbWBZV1T (ORCPT ); Sun, 26 Feb 2006 16:27:19 -0500 Message-ID: <44021D2D.20105@vilain.net> Date: Mon, 27 Feb 2006 10:27:09 +1300 From: Sam Vilain User-Agent: Mozilla Thunderbird 1.0.7 (X11/20051013) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Theodore Ts'o" Cc: Xin Zhao , Arjan van de Ven , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: question about possibility of data loss in Ext2/3 file system References: <4ae3c140602221356x15015171h5aa4a3d7bb6034e0@mail.gmail.com> <1140645651.2979.79.camel@laptopd505.fenrus.org> <4ae3c140602221434v6ec583a7yf04df5fa7a4948fc@mail.gmail.com> <20060223045836.GC9645@thunk.org> <43FE1110.1030707@vilain.net> <20060224162957.GA22097@thunk.org> In-Reply-To: <20060224162957.GA22097@thunk.org> X-Enigmail-Version: 0.92.1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Theodore Ts'o wrote: >>I always liked Sun's approach to this in Online Disk Suite - journal at >>the block device level rather than the FS / application level. >>Something I haven't seen from the Linux md-utils or DM. > You can do data block journalling in ext3. But the performance impact > can be significant for some work loads. TNSFAAFL. Sure, but on a large system with a big array, you just move the journal to a seperate diskset. That can make a big speed improvement for those types of update patterns where you care about always applying updates sequentially, such as a filesystem or a database. Sam.