I'm experiencing something somewhat similar on a home server of ours.
The four partitions (/, /boot. /home, /var) are all MD RAID1 arrays.
On a reboot yesterday morning, the MD array /boot was on failed to
start. This morning, it was the /home array.
When I logged in this morning, /home was not mounted. The reason was
that the MD array was down:
ga...@robin:/$ sudo mdadm --detail /dev/md3
/dev/md3:
Version : 00.90
Creation Time : Mon Sep 18 23:27:46 2006
Raid Level : raid1
Used Dev Size : 292439104 (278.89 GiB 299.46 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 3
Persistence : Superblock is persistent
Update Time : Thu May 6 23:43:34 2010
State : active, Not Started
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : 0019b5ec:1ad12c80:0df67ddf:f4706d12
Events : 0.4177842
Number Major Minor RaidDevice State
0 8 7 0 active sync /dev/sda7
1 8 23 1 active sync /dev/sdb7
I then ran:
ga...@robin:/$ sudo mdadm --stop /dev/md3
mdadm: stopped /dev/md3
ga...@robin:/$ sudo mdadm --assemble /dev/md3
mdadm: /dev/md3 has been started with 2 drives.
mounted the drive and all was well. However, there definitely seems to
be some problem with the MD raid arrays.
Any suggestions for what to look at. I found this bug via this thread
which seems to have some more people seeing similar issues:
http://ubuntuforums.org/showthread.php?p=9240332
Gavin
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Mdadm array fails to assemble on boot.
https://bugs.launchpad.net/bugs/573477
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