From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars =?UTF-8?B?VMOkdWJlcg==?= Subject: 16 HDDs too much for RAID6? Date: Thu, 6 Mar 2008 10:01:28 +0100 Message-ID: <20080306100128.8daad6bd.taeuber@bbaw.de> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hallo! Here we have another problem with our RAID6 and 16 HDDs: monosan:~ # mdadm -V mdadm - v2.6.2 - 21st May 2007 monosan:~ # mdadm -C /dev/md4 -l6 -n 16 -x 0 /dev/dm-* mdadm: /dev/dm-0 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-1 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-10 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-11 appears to contain an ext2fs file system size=3D-2147483648K mtime=3DThu Jan 1 01:00:00 1970 mdadm: /dev/dm-11 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-12 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-13 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-14 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-2 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-3 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-4 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-5 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-6 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 mdadm: /dev/dm-7 appears to be part of a raid array: level=3Draid6 devices=3D15 ctime=3DWed Feb 13 10:38:52 2008 Continue creating array? y mdadm: array /dev/md4 started. monosan:~ # mdadm --detail --scan| fgrep md4 >> /etc/mdadm.conf=20 monosan:~ # mdadm -S /dev/md4 mdadm: stopped /dev/md4 monosan:~ # mdadm -A /dev/md4 mdadm: WARNING /dev/dm-9 and /dev/dm-8 appear to have very similar supe= rblocks. If they are really different, please --zero the superblock on one If they are the same or overlap, please remove one from the DEVICE list in mdadm.conf. This happens _always_ when the arreay is reassembled. The actual device= s with the duplicated superblocks differ sometimes. Are 16 drives too much for RAID6? Thanks Lars --=20 Informationstechnologie Berlin-Brandenburgische Akademie der Wissenschaften J=C3=A4gerstrasse 22-23 10117 Berlin Tel.: +49 30 20370-352 http://www.bbaw.de -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html