From: Pavel Machek Subject: Re: [patch] ext2/3: document conditions when reliable operation is possible Date: Wed, 26 Aug 2009 03:16:06 +0200 Message-ID: <20090826011605.GS4300__30893.3613742285$1251249445$gmane$org@elf.ucw.cz> References: <4A9468E8.607@redhat.com> <20090825225114.GE4300@elf.ucw.cz> <4A946DD1.8090906@redhat.com> <20090825232601.GF4300@elf.ucw.cz> <4A947682.2010204@redhat.com> <20090825235359.GJ4300@elf.ucw.cz> <4A947DA9.2080906@redhat.com> <20090826001645.GN4300@elf.ucw.cz> <4A948259.40007@redhat.com> <20090826010018.GA17684@mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: Theodore Tso , Ric Wheeler , Florian Weimer , Goswin von Brederlow , Rob Landley , kernel list Return-path: Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:47360 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932352AbZHZBQN (ORCPT ); Tue, 25 Aug 2009 21:16:13 -0400 Content-Disposition: inline In-Reply-To: <20090826010018.GA17684@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: Hi! > 3) Does that mean that you shouldn't use ext3 on RAID drives? Of > course not! First of all, Ext3 still saves you against kernel panics > and hangs caused by device driver bugs or other kernel hangs. You > will lose less data, and avoid needing to run a long and painful fsck > after a forced reboot, compared to if you used ext2. You are making Actually... ext3 + MD RAID5 will still have a problem on kernel panic. MD RAID5 is implemented in software, so if kernel panics, you can still get inconsistent data in your array. I mostly agree with the rest. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html