From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757260AbZHZLWa (ORCPT ); Wed, 26 Aug 2009 07:22:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757078AbZHZLW3 (ORCPT ); Wed, 26 Aug 2009 07:22:29 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:33667 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756903AbZHZLW2 (ORCPT ); Wed, 26 Aug 2009 07:22:28 -0400 Date: Wed, 26 Aug 2009 13:22:20 +0200 From: Pavel Machek To: Rik van Riel Cc: Ric Wheeler , david@lang.hm, Theodore Tso , Florian Weimer , Goswin von Brederlow , Rob Landley , 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: [patch] document flash/RAID dangers Message-ID: <20090826112219.GE26595@elf.ucw.cz> References: <20090825222112.GB4300@elf.ucw.cz> <20090825224004.GD4300@elf.ucw.cz> <20090825233701.GH4300@elf.ucw.cz> <4A947839.4010601@redhat.com> <20090826000657.GK4300@elf.ucw.cz> <4A947E05.8070406@redhat.com> <20090826002045.GO4300@elf.ucw.cz> <4A94B8FE.8050307@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A94B8FE.8050307@redhat.com> 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 Wed 2009-08-26 00:24:30, Rik van Riel wrote: > Pavel Machek wrote: > >> Look, I don't need full drive failure for this to happen. I can just >> remove one disk from array. I don't need power failure, I can just >> press the power button. I don't even need to rebuild anything, I can >> just write to degraded array. >> >> Given that all events are under my control, statistics make little >> sense here. > > I recommend a sledgehammer. > > If you want to lose your data, you might as well have some fun. > > No need to bore yourself to tears by simulating events that are > unlikely to happen simultaneously to careful system administrators. Sledgehammer is hardware problem, and I'm demonstrating software/documentation problem we have here. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html