From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yann Ormanns Subject: Re: RAID6 simply does not start as /dev/md8 Date: Fri, 08 Apr 2011 16:58:49 +0200 Message-ID: <4D9F22A9.1030005@web.de> References: <4D9EC097.7010600@web.de> <20110408151751.5e2b61f1@natsu> <4D9F1962.3050806@web.de> <4D9F1A5A.1060600@grumpydevil.homelinux.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4D9F1A5A.1060600@grumpydevil.homelinux.org> Sender: linux-raid-owner@vger.kernel.org To: Rudy Zijlstra Cc: Roman Mamedov , linux-raid@vger.kernel.org List-Id: linux-raid.ids Subject: Re: RAID6 simply does not start as /dev/md8 From: Rudy Zijlstra To: Yann Ormanns Date: 2011-04-08 16:36 (+0200) > Do you have perhaps old raid metadata on the disks? Are you certain you > have no raid metadata on the whole disks? > you can check with mdadm --Examine /dev/sdc > > Cheers > > > Rudy > To eliminate this possibility, I "zeroed" all six disks before I created the array: dd if=/dev/zero of=/dev/sda bs=1M ... dd if=/dev/zero of=/dev/sdf bs=1M Output of mdadm -E /dev/sda1: /dev/sda1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 6286b922:2da22a6c:f8fba333:fc88f457 Name : Atlas:8 (local to host Atlas) Creation Time : Fri Apr 8 00:58:12 2011 Raid Level : raid6 Raid Devices : 6 Avail Dev Size : 3907025072 (1863.01 GiB 2000.40 GB) Array Size : 15628095488 (7452.06 GiB 8001.58 GB) Used Dev Size : 3907023872 (1863.01 GiB 2000.40 GB) Data Offset : 2048 sectors Super Offset : 8 sectors State : clean Device UUID : 1a016923:a408d8ee:d8f6625f:bcf55b66 Update Time : Fri Apr 8 09:53:13 2011 Checksum : 69969b9b - correct Events : 19 Layout : left-symmetric Chunk Size : 512K Device Role : Active device 0 Array State : AAAAAA ('A' == active, '.' == missing) The complete output of mdadm -E /dev/sd[a,b,c,d,e,f]1 can be found here: http://nopaste.info/658b72791c_nl.html Best regards, Yann