Raid1 device disappears on reboot

[Clive Menzies <clive@clivemenzies.co.uk>]

Hi

After failing to resolve this problem at the time of install (d-i rc2),
I
created a Raid1 array manually.

This box has 1 80Gb ATA disk with sarge installed.  Plus 2 SATA 120Gb
drives
with the following:
description: RAID bus controller
             product: 82801EB (ICH5R) SATA (cc=RAID)
             vendor: Intel Corp.
             physical id: 1f.2
             bus info:
	     pci@00:1f.2
	     version: 02
	     clock: 66MHz


I created the raid device with:

mdadm -Cv /dev/md0 -n2 -l1 /dev/sda1 /dev/sdb1

cma@Mars:~$ sudo mkfs.ext3 /dev/md0
mke2fs 1.35 (28-Feb-2004)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
15007744 inodes, 30013408 blocks
1500670 blocks (5.00%) reserved for the super user
First data block=0
916 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632,
	2654208,
	4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

Checked /etc/fstab:
# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/hda1       /               ext3    defaults,errors=remount-ro 0
1
/dev/md0      /home           ext3    defaults        0       2
/dev/hda8       /tmp            ext3    defaults        0       2
/dev/hda5       /usr            ext3    defaults        0       2
/dev/hda6       /var            ext3    defaults        0       2
/dev/hda7       none            swap    sw              0       0
/dev/hdc        /media/cdrom0   iso9660 ro,user,noauto  0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto  0       0


I then mounted it:

cma@Mars:~$ sudo mount /home
cma@Mars:~$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda1             251M  109M  129M  46% /
tmpfs                 252M     0  252M   0% /dev/shm
/dev/hda8             358M  8.1M  331M   3% /tmp
/dev/hda5             4.6G  300M  4.1G   7% /usr
/dev/hda6             2.8G   81M  2.6G   3% /var
/dev/md0              113G   33M  107G   1% /home


So everything is fine and dandy until I reboot:

dmesg output:
SCSI subsystem initialized
sbp2: $Rev: 1219 $ Ben Collins <bcollins@debian.org>
Capability LSM initialized
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: md0 stopped.
EXT3-fs: unable to read superblock

Once booted I try to mount or fsck /dev/md0 and it's like it disappeared
;(

Googling found posts relating to mounting / or /boot.  I'm stumped ;)

Regards

Clive


-- 
www.clivemenzies.co.uk ...
...strategies for business