FAI client Install: 12.04: mdadm fails to create /dev/md0 or /dev/md1

[Denny Schierz]

hi,

i've installed a base Ubuntu 12.04 and installed fai-quickstart to create the NFS rootfs. After that, I copied the rootfs via rsync to the Debian server, so that I can be sure, that not the debootstrapping from the Debian side was the problem.

I made a screenshot:

http://img31.imageshack.us/img31/2239/bildschirmfoto20120516u.png

fai fails with:

Executing: yes | mdadm --create  /dev/md0 --level=raid1 --force --run --raid-devices=2 /dev/sda1 /dev/sdb1 

and the message:

md: coul not open unknown-block(8,1)
md: md_import_device returned -16
...

md0 : active raid1 sdb1[1] sda1[0]
      307188 blocks super 1.2 [2/2] [UU]
      
unused devices: <none>

root at A-CLIENT:~# mdadm --examine --scan /dev/sda1
ARRAY /dev/md/0 metadata=1.2 UUID=4c89a950:00333cd5:926afd8b:0d5bb738 name=A-CLIENT:0

root at A-CLIENT:~# mdadm --examine --scan /dev/sdb1
ARRAY /dev/md/0 metadata=1.2 UUID=4c89a950:00333cd5:926afd8b:0d5bb738 name=A-CLIENT:0 

root at A-CLIENT:~# ls -l /dev/sd*
brw-rw---- 1 root disk 8,  0 May 16 09:29 /dev/sda
brw-rw---- 1 root disk 8,  1 May 16 09:29 /dev/sda1
brw-rw---- 1 root disk 8,  2 May 16 09:29 /dev/sda2
-rw-r--r-- 1 root root     0 May 16 09:29 /dev/sda5
brw-rw---- 1 root disk 8, 16 May 16 09:29 /dev/sdb
brw-rw---- 1 root disk 8, 17 May 16 09:29 /dev/sdb1
brw-rw---- 1 root disk 8, 18 May 16 09:29 /dev/sdb2


dmesg

[...]

[   14.446641]  sda: unknown partition table
[   14.698748] sd 2:0:1:0: [sdb] Cache data unavailable
[   14.699048] sd 2:0:1:0: [sdb] Assuming drive cache: write through
[   14.700540]  sdb: unknown partition table
[   15.941025] md: could not open unknown-block(8,1).
[   15.941328] md: md_import_device returned -16
[   15.951479] md: bind<sda1>
[   15.959158] md: bind<sdb1>
[   15.960721] bio: create slab <bio-1> at 1
[   15.960770] md/raid1:md0: not clean -- starting background reconstruction
[   15.961180] md/raid1:md0: active with 2 out of 2 mirrors
[   15.961201] md0: detected capacity change from 0 to 314560512
[   15.962534] md: resync of RAID array md0
[   15.962536] md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
[   15.962538] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for resync.
[   15.962541] md: using 128k window, over a total of 307188k.
[   15.965111]  md0: unknown partition table
[   20.524616] md: md0: resync done.
[   20.578447] RAID1 conf printout:
[   20.578449]  --- wd:2 rd:2
[   20.578451]  disk 0, wo:0, o:1, dev:sda1
[   20.578453]  disk 1, wo:0, o:1, dev:sdb1



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