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Old 07-27-2007, 08:09 PM   #1
Child of Wonder
Registered: Jul 2004
Location: Sioux Falls, SD
Distribution: Debian, Ubuntu, Fedora, Red Hat
Posts: 69

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Removed RAID5 array and now no boot

I'm having a great time with this little problem!

My home server is running Ubuntu 6.10 server and had the following disk configuration:

/dev/md0 = 3x500GB RAID 5, /storage
/dev/md1 = 2x20GB RAID 1, /
/dev/md2 = 2x20GB RAID 1, swap

I'm migrating to a VMWare ESX server and now that I have the file share aspect of it set up, I copied all my data off the /storage share and removed the 3x500GB drives.

However, now my system can't boot since mdadm now labels the 2x20GB drives as /dev/md0 and /dev/md1, respectively.

My system is using lilo as a bootloader. I've even gone so far as to plug the 3x500GB drives back in but all I seem to get is initramfs prompt. I did get it to boot normally once but then the 3x500GB drives were /dev/md0 again and I could not execute /sbin/lilo to boot to md0 in the future (which would be my RAID 1 array after I power down and remove the 500GB drives again) because the 3x500GB drives are currently RAID 5 and lilo won't apply the changes.

I know all I need to do is change lilo.conf to reflect the correct md0 to boot to, however I have no way of running /sbin/lilo to apply the changes. Any suggestions?
Old 07-27-2007, 09:25 PM   #2
Simon Bridge
LQ Guru
Registered: Oct 2003
Location: Waiheke NZ
Distribution: Ubuntu
Posts: 9,211

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When you remove an array, it is tidier to dismantle it with mdadmin before unplugging things.

But, surely, all you need is the boot device specified as /dev/md0 in lilo.conf and an adjusted fstab?
Old 07-27-2007, 09:58 PM   #3
Child of Wonder
Registered: Jul 2004
Location: Sioux Falls, SD
Distribution: Debian, Ubuntu, Fedora, Red Hat
Posts: 69

Original Poster
Rep: Reputation: 16
Yeah, that's what it needed. Once I got a temporary CD-ROM installed in the server and booted to a rescue disk, it was a simple matter of editing lilo.conf to use /dev/md0, editing fstab, and then using chroot to run /sbin/lilo.



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