Re: mdadm array not found on reboot

["Jeffrey B. Layton" <laytonjb@charter.net>]

Justin Piszcz wrote:
>
>
> On Mon, 7 May 2007, Jeffrey B. Layton wrote:
>
>> Justin Piszcz wrote:
>>>
>>>
>>> On Mon, 7 May 2007, Jeffrey B. Layton wrote:
>>>
>>>> Hello,
>>>>
>>>> I apologize if this is a FAQ question or a typical newbie question,
>>>> but by google efforts have yielded anything yet.
>>>>
>>>> I built a RAID-1 using mdadm (Centos 4.2 with 2.6.16.19 kernel
>>>> and mdadm 1.6.0-2). It's just two SATA drives that I created using:
>>>>
>>>> mdadm --create --verbose /dev/md1 --level=raid1 --raid-devices=2 
>>>> /dev/sda1 /dev/sdb1
>>>>
>>>> The md built correctly and I built an ext3 on it. I created 
>>>> /etc/mdadm.conf
>>>> and modified /etc/fstab to mount the device. But when I reboot, the 
>>>> kernel
>>>> drops into RAID repair mode because it can't seem to find /dev/md1 and
>>>> yells about not finding any valid superblock (I can get the exact 
>>>> message
>>>> if needed). However I can mount /dev/sda1 with no problems.
>>>>
>>>> The only way I can get md1 back is to issue the command:
>>>>
>>>> mdadm -A /dev/md1 /dev/sda1 /dev/sdb1
>>>>
>>>> and everything works. I want to have /dev/md1 mounted automatically
>>>> on boot. I'm missing something simple here - how do I do this?
>>>
>>> Sounds like a udev issue and/or you did not create the mdadm.conf 
>>> properly. Show us your mdadm.conf.
>> ARRAY /dev/md1 level=raid1 num-devices=2 
>> UUID=e235ee6c:415f1494:23c28b59:afd20140
>>  devices=/dev/sda1,/dev/sdb1
>> ARRAY /dev/md0 level=raid1 num-devices=2 
>> UUID=7121b438:7d36f9f6:8aa9c8b3:b5b0d211
>>  devices=/dev/hdc1,/dev/hdd1
>
> What distro?
CentOS 4.2. I've been reading something about raidautorun. Would help in 
this case?

Thanks!

Jeff