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

Hi Vaidhy,
The problem was fixed by compiling all the required components into the kernel, ie. not modules. Thank you very much for the answer. 

Regards,
Clement

Vaidhyanathan Mayilrangam Gopalan wrote:


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
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