From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Kraus Subject: Re: mdadm creates corrupt superblock Date: Wed, 19 Nov 2014 10:55:05 +0100 Message-ID: <546C68F9.7070307@hanswkraus.com> References: <544FDB1C.5030306@hanswkraus.com> <20141029080019.272bc844@notabene.brown> <545157E4.3090204@hanswkraus.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <545157E4.3090204@hanswkraus.com> Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: Linux-RAID List-Id: linux-raid.ids Hi, I think I found the problem. 'badblocks' reports sector 64 of the HD as errornous. But the HD neither reports a read error nor remaps that sector. Is it possible to parametrize mdadm that it doesn't use that sector? Regards, Hans Am 29.10.2014 22:11, schrieb Hans Kraus: > Hi Neil, > > many thanks for your response. I rebooted the machine and got new drive > assignments. The drive in question is now sdc1. mdadm gave an error with > the dump, results below (nothing to report by dmesg) [by the way, I > wasn'nt even able to create an array on that drive with > 'mdadm --create --level=1 -n 2 /dev/sdc1 missing', same error(s)]: > ------------------------------------------------------------------------- > root@nashorn:~# mdadm -E /dev/sdb1 > /dev/sdb1: > Magic : a92b4efc > Version : 1.2 > Feature Map : 0x1 > Array UUID : e7caa5d1:b33fd2a5:7782fb0c:9d8d9d5b > Name : nashorn:126 (local to host nashorn) > Creation Time : Mon Oct 27 15:58:38 2014 > Raid Level : raid1 > Raid Devices : 2 > > Avail Dev Size : 1953260976 (931.39 GiB 1000.07 GB) > Array Size : 976630488 (931.39 GiB 1000.07 GB) > Data Offset : 262144 sectors > Super Offset : 8 sectors > Unused Space : before=262056 sectors, after=0 sectors > State : clean > Device UUID : f7a91c46:e4cda0c0:1b770fd7:876634f8 > > Internal Bitmap : 8 sectors from superblock > Update Time : Wed Oct 29 18:42:16 2014 > Bad Block Log : 512 entries available at offset 72 sectors > Checksum : 939b22d1 - correct > Events : 3325 > > > Device Role : Active device 0 > Array State : AA ('A' == active, '.' == missing, 'R' == replacing) > root@nashorn:~# > ------------------------------------------------------------------------- > root@nashorn:~# mdadm -E /dev/sdh1 > /dev/sdh1: > Magic : a92b4efc > Version : 1.2 > Feature Map : 0x1 > Array UUID : e7caa5d1:b33fd2a5:7782fb0c:9d8d9d5b > Name : nashorn:126 (local to host nashorn) > Creation Time : Mon Oct 27 15:58:38 2014 > Raid Level : raid1 > Raid Devices : 2 > > Avail Dev Size : 1953260976 (931.39 GiB 1000.07 GB) > Array Size : 976630488 (931.39 GiB 1000.07 GB) > Data Offset : 262144 sectors > Super Offset : 8 sectors > Unused Space : before=262046 sectors, after=0 sectors > State : clean > Device UUID : 089d1d0e:4d5ca222:dd716acb:0813815c > > Internal Bitmap : 8 sectors from superblock > Update Time : Wed Oct 29 18:42:16 2014 > Bad Block Log : 512 entries available at offset 82 sectors > Checksum : 16454b96 - correct > Events : 3325 > > > Device Role : Active device 1 > Array State : AA ('A' == active, '.' == missing, 'R' == replacing) > root@nashorn:~# > ------------------------------------------------------------------------- > root@nashorn:~# mdadm -E /dev/sdc1 > /dev/sdc1: > Magic : a92b4efc > Version : 1.2 > Feature Map : 0x1 > Array UUID : e7caa5d1:b33fd2a5:7782fb0c:9d8d9d5b > Name : nashorn:126 (local to host nashorn) > Creation Time : Mon Oct 27 15:58:38 2014 > Raid Level : raid1 > Raid Devices : 2 > > Avail Dev Size : 1953260976 (931.39 GiB 1000.07 GB) > Array Size : 0 > Used Dev Size : 0 > Data Offset : 262144 sectors > Super Offset : 8 sectors > Unused Space : before=262056 sectors, after=1953260976 sectors > State : clean > Device UUID : 4d1420c6:79978477:e86412b1:24beebfc > > Internal Bitmap : 8 sectors from superblock > Update Time : Tue Oct 28 11:53:49 2014 > Bad Block Log : 512 entries available at offset 72 sectors > Checksum : 6f02d040 - expected 891eedff > Events : 0 > > > Device Role : spare > Array State : RR ('A' == active, '.' == missing, 'R' == replacing) > ------------------------------------------------------------------------- > root@nashorn:~# mkdir -p /tmp/dump > root@nashorn:~# mdadm --dump /tmp/dump /dev/sdc1 > mdadm: Failed to copy metadata from /dev/sdc1 to /tmp/dump/sdc1 > ------------------------------------------------------------------------- > Kind regards, Hans > > Am 28.10.2014 22:00, schrieb NeilBrown: >> On Tue, 28 Oct 2014 19:06:20 +0100 Hans Kraus >> wrote: >> >>> Hi, >>> >>> I debugged my problem a bit more: it seems that mdadm creates a defect >>> superblock. That's repeatedly happening, but only for one drive. I >>> copied zeros to that drive (via ddrescue /dev/zero ...) and the drive >>> looks OK. The info I got: >>> >> >> and you send me the metadata of all your devices please? >> >> mkdir /tmp/dump >> mdadm --dump /tmp/dump /dev/sde1 >> tar czvf /tmp/dump.tgz /tmp/dump >> >> and then send /tmp/dump.tgz >> >> Thanks. >> >> NeilBrown >> >> ================================================================================================================================================================================================= >> >>> root@nashorn:/home/kraush/work/smartctrl# mdadm --zero-superblock >>> /dev/sde1 >>> mdadm: Unrecognised md component device - /dev/sde1 >>> root@nashorn:/home/kraush/work/smartctrl# mdadm --add /dev/md126 >>> /dev/sde1 >>> mdadm: add new device failed for /dev/sde1 as 4: Invalid argument >>> root@nashorn:/home/kraush/work/smartctrl# mdadm -E /dev/sde1 >>> /dev/sde1: >>> Magic : a92b4efc >>> Version : 1.2 >>> Feature Map : 0x1 >>> Array UUID : e7caa5d1:b33fd2a5:7782fb0c:9d8d9d5b >>> Name : nashorn:126 (local to host nashorn) >>> Creation Time : Mon Oct 27 15:58:38 2014 >>> Raid Level : raid1 >>> Raid Devices : 2 >>> >>> Avail Dev Size : 1953260976 (931.39 GiB 1000.07 GB) >>> Array Size : 0 >>> Used Dev Size : 0 >>> Data Offset : 262144 sectors >>> Super Offset : 8 sectors >>> Unused Space : before=262056 sectors, after=1953260976 sectors >>> State : clean >>> Device UUID : 4d1420c6:79978477:e86412b1:24beebfc >>> >>> Internal Bitmap : 8 sectors from superblock >>> Update Time : Tue Oct 28 11:53:49 2014 >>> Bad Block Log : 512 entries available at offset 72 sectors >>> Checksum : 6f02d040 - expected 891eedff >>> Events : 0 >>> >>> >>> Device Role : spare >>> Array State : RR ('A' == active, '.' == missing, 'R' == replacing) >>> root@nashorn:/home/kraush/work/smartctrl# >>> ----------------------------------------------------------------------------------------------------------- >>> >>> root@nashorn:/home/kraush/work/smartctrl# cat /proc/mdstat >>> Personalities : [raid1] [raid6] [raid5] [raid4] >>> md127 : active (auto-read-only) raid6 sda1[0] sdk1[6](S) sdl2[7](S) >>> sdh1[5] sdg1[4] sdf1[3] sdc1[2] sdb1[1] >>> 1953017856 blocks super 1.2 level 6, 512k chunk, algorithm 2 >>> [6/6] [UUUUUU] >>> bitmap: 0/4 pages [0KB], 65536KB chunk >>> >>> md10 : active (auto-read-only) raid1 sdi2[0] sdl3[1] >>> 87833408 blocks super 1.2 [2/2] [UU] >>> bitmap: 0/1 pages [0KB], 65536KB chunk >>> >>> md126 : active raid1 sdd1[3] sdj1[2] >>> 488254464 blocks super 1.2 [2/2] [UU] >>> bitmap: 0/4 pages [0KB], 65536KB chunk >>> >>> md0 : active raid1 sdl1[4] sdd2[3] sdi1[5] >>> 156157824 blocks super 1.2 [3/1] [U__] >>> [===================>.] recovery = 95.6% (149290048/156157824) >>> finish=8.4min speed=13496K/sec >>> bitmap: 1/2 pages [4KB], 65536KB chunk >>> >>> unused devices: >>> root@nashorn:/home/kraush/work/smartctrl# >>> ----------------------------------------------------------------------------------------------------------- >>> >>> dmesg: >>> [33299.387382] md: invalid superblock checksum on sde1 >>> [33299.387385] md: sde1 does not have a valid v1.2 superblock, not >>> importing! >>> [33299.387408] md: md_import_device returned -22 >>> root@nashorn:/home/kraush/work/smartctrl# >>> ----------------------------------------------------------------------------------------------------------- >>> >>> root@nashorn:/home/kraush/work/mdadm# mdadm --version >>> mdadm - v3.3-161-gfed12d4 - 21st August 2014 >>> ================================================================================================================================================================================================= >>> >>> >>> Kind regards, Hans >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html