From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753463AbZIBU4P (ORCPT ); Wed, 2 Sep 2009 16:56:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753430AbZIBU4P (ORCPT ); Wed, 2 Sep 2009 16:56:15 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:52364 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753431AbZIBU4O (ORCPT ); Wed, 2 Sep 2009 16:56:14 -0400 Date: Wed, 2 Sep 2009 22:55:58 +0200 From: Pavel Machek To: Christian Kujau Cc: Theodore Tso , NeilBrown , Ric Wheeler , Rob Landley , Florian Weimer , Goswin von Brederlow , kernel list , Andrew Morton , mtk.manpages@gmail.com, rdunlap@xenotime.net, linux-doc@vger.kernel.org, linux-ext4@vger.kernel.org, corbet@lwn.net Subject: Re: raid is dangerous but that's secret (was Re: [patch] ext2/3: document conditions when reliable operation is possible) Message-ID: <20090902205558.GB2398@elf.ucw.cz> References: <20090825232601.GF4300@elf.ucw.cz> <4A947682.2010204@redhat.com> <200908262253.17886.rob@landley.net> <4A967175.5070700@redhat.com> <20090827221319.GA1601@ucw.cz> <4A9733C1.2070904@redhat.com> <20090828064449.GA27528@elf.ucw.cz> <20090828120854.GA8153@mit.edu> <20090830075135.GA1874@ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun 2009-08-30 02:01:10, Christian Kujau wrote: > On Sun, 30 Aug 2009 at 09:51, Pavel Machek wrote: > > > give system administrators. It's better than the fear-mongering > > > patches you had proposed earlier, but what would be better *still* is > > > telling people why running with degraded RAID arrays is bad, and to > > > give them further tips about how to use RAID arrays safely. > > > > Maybe this belongs to Doc*/filesystems, and more detailed RAID > > description should go to md description? > > Why should this be placed in *kernel* documentation anyway? The "dangers > of RAID", the hints that "backups are a good idea" - isn't that something > for howtos for sysadmins? No end-user will ever look into The fact that two kernel subsystems (MD RAID, journaling filesystems) do not work well together is surprising and should be documented near the source. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html