Re: help: re-add needed after each reboot

[NeilBrown <neilb@suse.de>]

[-- Attachment #1: Type: text/plain, Size: 4546 bytes --]

On Mon, 7 May 2012 23:41:34 -0700 "D. Lin" <dlbulk-mllr@yahoo.com> wrote:

> 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
> 
>

Thanks for the extra detail.  Everything looks sensible so far.

Can you check the contents of mdadm.conf on the initrd please.
e.g.

   cd /tmp
   zcat /boot/initrd | cpio -idv
   cat etc/mdadm/mdadm.conf

something like that.

NeilBrown

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 828 bytes --]