Re: Kernel 2.6.6 does not recognise /dev/md0 automatically

[Vaidhyanathan Mayilrangam Gopalan <vaidhy@loonys.net>]

I had similar problems switching to kernel 2.6. I had to install devfsd
for me to be able to get the /dev mappings (and disable mount /dev
automatically in the kernel)

Hope it helps,
Vaidhy

On Fri, 2004-07-09 at 07:45, Clement wrote:
> Hi Guys,
> 
> I tried many things and just cannot fix this, after upgrading to 
> kernel-image-2.6.6-1-686, the Debian machine does not recognize /dev/md0 
> anymore. 
> 
> Before, using kernel-image-2.4.25-1-386, the machine works well and will 
> mount these automatically:
> 
>     /dev/md0   to    /boot
>     /dev/md1   to    /
> 
> After upgrading to 2.6.6, during the boot process, it reports 'invalid 
> superblock' on /dev/md0.  I can continue without mounting /dev/md0 to 
> /boot.  But /dev/md0 continues to disappear:
> 
>     # cat /proc/mdstat
>       Personalities : [raid1]
>       md1 : active raid1 hda2[0] hdc2[1]
>             4883648 blocks [2/2] [UU]
> 
> The /dev/md0 is not corrupted yet.  In kernel 2.6.6, I can still get it by
> 
>     # mdadm -A /dev/md0 /dev/hda1 /dev/hdc1
>     mdadm: /dev/md0 has been started with 2 drives.
>     # mount /dev/md0 /boot
>     # cat /proc/mdstat
>     Personalities : [raid1]
>     md0 : active raid1 hda1[0] hdc1[1]
>           80192 blocks [2/2] [UU]
> 
>     md1 : active raid1 hda2[0] hdc2[1]
>           4883648 blocks [2/2] [UU]
> 
> 
> Or I can boot into 2.4.25 and everything is fine.  Mounting /boot on 
> boot is not a necessity.  But losing /dev/md0 for no reason is a major 
> concern with 2.6.6.  Do you know the reason and/or a fix?  Waiting to 
> hear from you.
> 
> The machine is a testing machine w Intel Celeron 366, 96MB RAM and 
> 2x160GB ATA drives attached to /dev/hda and /dev/hdc for a RAID 1 
> configuration.  Sarge is installed fresh from the installation CD 
> downloaded from debian.org.  Additional modules installed are mdadm, hdparm.
> 
> Regards,
> Clement
> 
> 
>