Hello everyone!
After rebooting one of our Debian servers yesterday (under normal
conditions), mdadm was not able to assemble /dev/md0 automaticly any more.
System: Debian Lenny, mdmadm v2.5.6, Kernel 2.6.26-preemptive-cpuset
(from Debian testing sources)
This is what I get during boot:
[...]
Begin: Mounting root file system... ...
Begin: Running /scripts/local-top ...
Begin: Loading MD modules ...
md: raid1 personality registered for level 1
Success: loaded module raid1.
Done.
Begin: Assembling all MD arrays ...
[...]
md: md0 stopped.
mdadm: no devices found for /dev/md0
Failure: failed to assemble all arrays.
[...]
Then the system falls back to BusyBox shell from initramfs, because the
root fs - which is located on /dev/md0 - could not be mounted.
But from the initramfs shell, it is possible to cleanly assemble and
mount the md0 array:
(initramfs) mdadm -A /dev/md0 /dev/sda2 /dev/sdb2
md: md0 stopped.
md: bind<sdb2>
md: bind<sda2>
raid1: raid set md0 active with 2 out of 2 mirrors
mdadm: /dev/md0 has been started with 2 drives.
(initramfs) mount /dev/md0 root
kjournald starting. Commit interval 5 seconds
EXT3 FS on md0, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
After leaving the initramfs shell with 'exit', the system continues to
boot normally.
Strange: /dev/md1 (swap) which is the first array in assembling order,
gets assembled and started correctly.
I also played around with ROOTDELAY=60, but this did not changed anything.
I'm grateful for any help.
Best regards, Tobias
PS: Maybe some helpful output (after starting the system the way
described above):
$ cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda2[0] sdb2[1]
487331648 blocks [2/2] [UU]
md1 : active raid1 sda1[0] sdb1[1]
1052160 blocks [2/2] [UU]
unused devices: <none>
$ mdadm --detail --scan
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=c3838888:50dbed72:15a9bffb:d0e83d23
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=0d0a0c79:70adae03:f802952b:2b58c14d
$ grep -v ^# /etc/mdadm/mdadm.conf
DEVICE /dev/sd*[0-9] /dev/sd*[0-9]
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
MAILADDR root
ARRAY /dev/md1 level=raid1 num-devices=2
UUID=c3838888:50dbed72:15a9bffb:d0e83d23
ARRAY /dev/md0 level=raid1 num-devices=2
UUID=0d0a0c79:70adae03:f802952b:2b58c14d
$ mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Thu Dec 11 14:18:44 2008
Raid Level : raid1
Array Size : 487331648 (464.76 GiB 499.03 GB)
Device Size : 487331648 (464.76 GiB 499.03 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Fri May 8 15:45:32 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 0d0a0c79:70adae03:f802952b:2b58c14d
Events : 0.900
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
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