Version: mdadm - v2.6.7.2 - 14th November 2008
OS: Debian (Lenny/Stable)
Installation: debian package
My Debian Lenny router's mdadm software raid setup is only partially
working now after a partition corruption that I had to recover from
backups (unfortunately, right now my backups only contain the files,
not actual images).
The same RAID1 setup for swap space is working fine (/dev/md1) except
for being mounted auto-ready-only. I've been troubleshooting for days.
When I reboot and add in root=/dev/md0 (the new array), it'll
eventually drop me to initramfs, and a viewing of dmesg shows mdadm
thinks /dev/md0 has no devices. Yet mdadm --examine /dev/hda1 reports
the superblock correctly, and says it's clean. But the kernel only
auto-detects one raid device, and /proc/mdstat only shows one as well.
mdadm.conf has been properly updated for both raids. I've tried
kernels 2.6.18-4-686, 2.6.18-5-686, 2.6.18-6-686, and recently
2.6.30-bpo.2-686.
> ls /dev/md*
/dev/md1
> mdadm --query /dev/hda1
/dev/hda1: is not an md array
/dev/hda1: device 1 in 2 device undetected raid1 /dev/.tmp.md0. Use
mdadm --examine for more detail.
> mdadm --run /dev/.tmp.md0
mdadm: error opening /dev/.tmp.md0: No such file or directory
> mdadm --examine /dev/hda1
/dev/hda1:
Magic : a92b4efc
Version : 00.90.03
UUID : 93419e79:9cbd9b5b:eaa0a77b:ba41beb2
Creation Time : Tue Oct 13 13:13:47 2009
Raid Level : raid1
Used Dev Size : 3968384 (3.78 GiB 4.06 GB)
Array Size : 3968384 (3.78 GiB 4.06 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Tue Oct 13 13:58:25 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 13f2f504 - correct
Events : 343
Number Major Minor RaidDevice State
this 1 3 1 1 active sync /dev/hda1
0 0 3 65 0 active sync /dev/hdb1
1 1 3 1 1 active sync /dev/hda1
> cat /proc/mdstat
Personalities : [raid1]
md1 : active (auto-read-only) raid1 hdb2[0] hda2[1]
228736 blocks [2/2] [UU]
unused devices: <none>
> grep md0 /var/log/syslog
Oct 13 11:06:11 debian-router kernel: [ 7.896393] md: md0 stopped.
Oct 13 11:06:11 debian-router kernel: [ 27.774204] md: md0 stopped.
Oct 13 11:06:21 debian-router mdadm[2514]: DeviceDisappeared event
detected on md device /dev/md0
Any help would be appreciated.
Matt
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