From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751702Ab0CSSUq (ORCPT ); Fri, 19 Mar 2010 14:20:46 -0400 Received: from mail.gmx.net ([213.165.64.20]:42327 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750865Ab0CSSUp (ORCPT ); Fri, 19 Mar 2010 14:20:45 -0400 X-Authenticated: #352556 X-Provags-ID: V01U2FsdGVkX1+2DqQbIda2XkolZRPpQl68eEsVdqp3jHg0mZrMTk u1pDawdupjNHpi Message-ID: <4BA3C07A.8030204@gmx.net> Date: Fri, 19 Mar 2010 19:20:42 +0100 From: Joachim Otahal User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100205 SeaMonkey/2.0.3 MIME-Version: 1.0 To: jin zhencheng CC: neilb@suse.de, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: BUG:write data to degrade raid5 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.58999999999999997 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org jin zhencheng schrieb: > hi; > > i use kernel is 2.6.26.2 > > what i do as follow: > > 1, I create a raid5: > mdadm -C /dev/md5 -l 5 -n 4 /dev/sda /dev/sdb /dev/sdc /dev/sdd > --metadata=1.0 --assume-clean > > 2, dd if=/dev/zero of=/dev/md5 bs=1M& > > write data to this raid5 > > 3, mdadm --manage /dev/md5 -f /dev/sda > > 4 mdadm --manage /dev/md5 -f /dev/sdb > > if i faild 2 disks ,then the OS kernel display OOP error and kernel down > > do somebody know why ? > > Is MD/RAID5 bug ? > RAID5 can only tolerate ONE drive to fail of ALL members. If you want to be able to fail two drives you will have to use RAID6 or RAID5 with one hot-spare (and give it time to rebuild before failing the second drive). PLEASE read the documentation on raid levels, like on wikipedia. Joachim Otahal