Re: mdadm creates corrupt superblock

[NeilBrown <neilb@suse.de>]

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On Tue, 28 Oct 2014 19:06:20 +0100 Hans Kraus <hans@hanswkraus.com> 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: <none>
> 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
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