From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Kraus Subject: Re: mdadm creates corrupt superblock Date: Wed, 29 Oct 2014 22:11:00 +0100 Message-ID: <545157E4.3090204@hanswkraus.com> References: <544FDB1C.5030306@hanswkraus.com> <20141029080019.272bc844@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20141029080019.272bc844@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: Linux-RAID List-Id: linux-raid.ids 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 >