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Old 05-15-2008, 04:00 PM   #1
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Registered: May 2008
Distribution: mandriva, red hat, knoppix
Posts: 2

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Upon reboot, /dev/md0 not found - mandriva 2008 spring

I have built many linux software raid arrays successfully.

I did a fresh install of mandriva 2008 spring (because I needed a new kernel for my sata controller and was tired of compiling kernels) and I have been having boot problems ever since.

I have 6 sata drives I am using in a raid-5 array. This array is *not* used for booting the os.

I create the array via:
mdadm --create /dev/md0 --verbose --chunk=32 --level=5 --devices=6 /dev/sd[abcdef]

I wait until it is ready (a few hours)

I create a filesystem via:
mkreiserfs /dev/md0

I make a directory /data

I make a /etc/fstab entry:
/dev/md0 /data reiserfs notail,relatime,user_xattr 1 3

I mount it:
mount -a

I make a /etc/mdadm.conf file:
cat DEVICE /dev/sda,/dev/sdb,/dev/sdc,/dev/sdd,/dev/sde,/dev/sdf > /etc/mdadm.conf
mdadm --detail --scan --verbose >> /etc/mdadm.conf

Everything is great. I can copy files to my raid array.

When I reboot however, I get a boot message that /dev/md0 can't be found, and I get a root prompt. I then
comment out the /dev/md0 line in /etc/fstab, and reboot.

After I boot, I run mdadm --assemble /dev/md0 /dev/sd[abcdef]
and I re-edit /etc/fstab removing the comment.
I then do a mount -a, and I have my raid array back online.

Why doesn't it get started up at boot time?
I haven't screwed with any setting related to booting.

thanks in advance,
Old 06-08-2008, 10:35 AM   #2
LQ Newbie
Registered: May 2008
Distribution: mandriva, red hat, knoppix
Posts: 2

Original Poster
Rep: Reputation: 0

This is a work around. It is a OS bug, not confusion on my part.


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