Thanks for your help.
>
> Would it be equally accurate to say that it didn't happen when you were
> running ubunutu 11.10?? My point is that maybe the important change is
> not in the kernel.
>
My system was running 11.04 when things worked. I skipped 11.10.
> What do you have in /etc/mdadm.conf ? (or maybe /etc/mdadm/mdadm.conf)
# egrep -v '^#|^$' /etc/mdadm/mdadm.conf
DEVICE partitions
CREATE owner=root group=disk mode=0660 auto=yes
HOMEHOST <system>
> If you stop the array, then
>
> mdadm -Asvvv
>
> what messages are generated, and what is the result?
>
root@anguish:/# mdadm --misc --stop /dev/md0
mdadm: stopped /dev/md0
[195415.073137] md0: detected capacity change from 4000789299200 to 0
[195415.073150] md: md0 stopped.
[195415.073166] md: unbind<sdc1>
[195415.092175] md: export_rdev(sdc1)
[195415.092210] md: unbind<sdd1>
[195415.092413] md: export_rdev(sdd1)
[195415.092533] md: unbind<sdb1>
[195415.104245] md: export_rdev(sdb1)
# mdadm -Asvvv
mdadm: looking for devices for further assembly
mdadm: no RAID superblock on /dev/sdd
mdadm: no RAID superblock on /dev/sdc
mdadm: no RAID superblock on /dev/sdb
mdadm: /dev/sdd1 is identified as a member of /dev/md/disc:0, slot 1.
mdadm: /dev/sdc1 is identified as a member of /dev/md/disc:0, slot 0.
mdadm: /dev/sdb1 is identified as a member of /dev/md/disc:0, slot 2.
mdadm: added /dev/sdd1 to /dev/md/disc:0 as 1
mdadm: added /dev/sdb1 to /dev/md/disc:0 as 2
mdadm: added /dev/sdc1 to /dev/md/disc:0 as 0
mdadm: /dev/md/disc:0 has been started with 3 drives.
mdadm: looking for devices for further assembly
mdadm: looking for devices for further assembly
mdadm: no recogniseable superblock on /dev/md/disc:0
mdadm: cannot open device /dev/sdd1: Device or resource busy
mdadm: cannot open device /dev/sdd: Device or resource busy
mdadm: cannot open device /dev/sdc1: Device or resource busy
mdadm: cannot open device /dev/sdc: Device or resource busy
mdadm: cannot open device /dev/sdb1: Device or resource busy
mdadm: cannot open device /dev/sdb: Device or resource busy
root@anguish:/# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md127 : active raid5 sdc1[4] sdb1[3] sdd1[2]
3907020800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3]
[UUU]
bitmap: 0/15 pages [0KB], 65536KB chunk
unused devices: <none>
please note that the md device is now md127, as opposed to md0. When
2.6.38 was running, md127 was auto discovered.
Now, I reboot the system. md0 is auto discovered and degraded.
[ 1.649849] md: linear personality registered for level -1
[ 1.658472] md: multipath personality registered for level -4
[ 1.665077] md: raid0 personality registered for level 0
[ 1.669855] md: raid1 personality registered for level 1
[ 1.869347] md: bind<sdd1>
[ 2.157297] md: bind<sdb1>
[ 2.168850] md: raid6 personality registered for level 6
[ 2.168923] md: raid5 personality registered for level 5
[ 2.168999] md: raid4 personality registered for level 4
[ 2.352210] md: raid10 personality registered for level 10
[ 2.378106] md/raid:md0: device sdb1 operational as raid disk 2
[ 2.378158] md/raid:md0: device sdd1 operational as raid disk 1
[ 2.378503] md/raid:md0: allocated 3228kB
[ 2.378629] md/raid:md0: raid level 5 active with 2 out of 3 devices,
algorithm 2
[ 2.378939] created bitmap (15 pages) for device md0
[ 2.379386] md0: bitmap initialized from disk: read 1/1 pages, set 0 of
29809 bits
[ 2.401485] md0: detected capacity change from 0 to 4000789299200
[ 2.410364] md0: unknown partition table
$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid5 sdb1[3] sdd1[2]
3907020800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2]
[_UU]
bitmap: 7/15 pages [28KB], 65536KB chunk
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