Re: help: re-add needed after each reboot

[NeilBrown <neilb@suse.de>]

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On Mon, 7 May 2012 09:29:03 -0700 "D. Lin" <dlbulk-mllr@yahoo.com> wrote:

> Hi,
> 
> I am running 3.2.0 (ubuntu 12.04). My raid5 has 3 disks (sd[cbd]1) and no
> spares. The system boots off a non-raid device and auto discovers and
> mounts the raid device.
> 
> For some reason, sdc1 is not automatically detected and is always missed
> on each boot. I have to re-add it back. What could be causing this?
> 
> This did not happen while I was running 2.6.38.

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.

What do you have in /etc/mdadm.conf ? (or maybe /etc/mdadm/mdadm.conf)
If you stop the array, then

  mdadm -Asvvv

what messages are generated, and what is the result?

NeilBrown


> 
> Thanks,
> 
> Dong Lin
> 
> 
> ; mdadm --misc --detail /dev/md0
> /dev/md0:
>         Version : 1.2
>   Creation Time : Fri Jul 22 22:39:40 2011
>      Raid Level : raid5
>      Array Size : 3907020800 (3726.03 GiB 4000.79 GB)
>   Used Dev Size : 1953510400 (1863.01 GiB 2000.39 GB)
>    Raid Devices : 3
>   Total Devices : 3
>     Persistence : Superblock is persistent
> 
>   Intent Bitmap : Internal
> 
>     Update Time : Mon May  7 09:21:29 2012
>           State : active
>  Active Devices : 3
> Working Devices : 3
>  Failed Devices : 0
>   Spare Devices : 0
> 
>          Layout : left-symmetric
>      Chunk Size : 512K
> 
>            Name : disc:0
>            UUID : 4195aaa7:0ebd37ce:d4b9481e:1a68f4a8
>          Events : 230784
> 
>     Number   Major   Minor   RaidDevice State
>        4       8       33        0      active sync   /dev/sdc1
>        2       8       49        1      active sync   /dev/sdd1
>        3       8       17        2      active sync   /dev/sdb1
> 
> 
> ----------------------------
> 
> here is what happened on boot:
> 
> ; dmesg |grep md
> [    1.781917] md: linear personality registered for level -1
> [    1.789184] md: multipath personality registered for level -4
> [    1.797121] md: raid0 personality registered for level 0
> [    1.801681] md: raid1 personality registered for level 1
> [    1.820485] ata7: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xfa00
> irq 14
> [    1.820547] ata8: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xfa08
> irq 15
> [    1.920271] md: bind<sdb1>
> [    1.962482] md: bind<sdd1>
> [    2.300917] md: raid6 personality registered for level 6
> [    2.300980] md: raid5 personality registered for level 5
> [    2.301036] md: raid4 personality registered for level 4
> [    2.306171] md: raid10 personality registered for level 10
> [    2.329393] md/raid:md0: device sdd1 operational as raid disk 1
> [    2.329450] md/raid:md0: device sdb1 operational as raid disk 2
> [    2.329792] md/raid:md0: allocated 3228kB
> [    2.329921] md/raid:md0: raid level 5 active with 2 out of 3 devices,
> algorithm 2
> [    2.330235] created bitmap (15 pages) for device md0
> [    2.330706] md0: bitmap initialized from disk: read 1/1 pages, set 0 of
> 29809 bits
> [    2.362404] md0: detected capacity change from 0 to 4000789299200
> [    2.367990]  md0: unknown partition table
> 
> 
> 
> =======================================
> partition tables:
> 
> ; fdisk -l | egrep '^/dev/sd[cbd]'
> /dev/sdb1              63  3907024064  1953512001   fd  Linux raid autodetect
> /dev/sdc1              63  3907024064  1953512001   fd  Linux raid autodetect
> /dev/sdd1              63  3907024064  1953512001   fd  Linux raid autodetect
> 
> 
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