Public bug reported:
I just upgraded a working 10.04 LTS server to 12.04 LTS. The server has
two non-boot drives in a software RAID1 configuration. This array worked
fine in 10.04 LTS.
When the machine boots I should get one active array, /dev/md0
consisting of /dev/sdb1 and /dev/sdc1. Instead, I get dumped to a
busybox session and after quitting that and booting I get two inactive
arrays: md0 (consisting of /dev/sdc1 as spare) and md127 (consisting of
/dev/sdb as spare). If I run mdadm --detail /dev/md0 or mdadm --detail
/dev/md127 I get that the device does not appear to be active.
Once I've finished booting, I can assemble my array manually by running
mdadm --stop /dev/md0 and mdadm --stop /dev/md127 and then assembling
the array with mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1.
Below are the results of some troubleshooting:
$ lsb_release -rd
Description: Ubuntu 12.04.2 LTS
Release: 12.04
$ apt-cache policy mdadm
mdadm:
Installed: 3.2.5-1ubuntu0.2
Candidate: 3.2.5-1ubuntu0.2
Version table:
*** 3.2.5-1ubuntu0.2 0
500 http://us.archive.ubuntu.com/ubuntu/ precise-updates/main amd64
Packages
100 /var/lib/dpkg/status
3.2.3-2ubuntu1 0
500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md0 : inactive sdc1[1](S)
1953513408 blocks
md127 : inactive sdb[2](S)
1953514496 blocks
unused devices: <none>
$ mdadm --examine /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : a4176cee:096f0ba6:40663db4:2b8b6d2c
Creation Time : Thu Jul 7 09:32:01 2011
Raid Level : raid1
Used Dev Size : 1953513408 (1863.02 GiB 2000.40 GB)
Array Size : 1953513408 (1863.02 GiB 2000.40 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Wed Apr 3 10:32:36 2013
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : d685ab7e - correct
Events : 722
Number Major Minor RaidDevice State
this 0 8 17 0 active sync /dev/sdb1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
$ mdadm --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 0.90.00
UUID : a4176cee:096f0ba6:40663db4:2b8b6d2c
Creation Time : Thu Jul 7 09:32:01 2011
Raid Level : raid1
Used Dev Size : 1953513408 (1863.02 GiB 2000.40 GB)
Array Size : 1953513408 (1863.02 GiB 2000.40 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Wed Apr 3 10:32:36 2013
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : d685ab90 - correct
Events : 722
Number Major Minor RaidDevice State
this 1 8 33 1 active sync /dev/sdc1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
** Affects: mdadm (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1164008
Title:
mdadm devices not recognized correctly at boot
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