Public bug reported:
Binary package hint: grub2
I have a RAID5 mdadm array on /dev/md0. It is fully functional but I
cannot boot from it because grub detects it as "/dev/md/0" (with an
extra slash). Running "update-grub", for example, produces a grub.cfg
with the lines "set root='(md/0)'". Upon rebooting, grub reports "error:
file not found" and drops into a rescue shell.
Some (or all) disks in this array were previously used in a RAID array
using mdadm metadata version 0.90. Now, however, they are using version
1.20. Since mdadm puts metadata v1.20 in a different location, I wonder
if perhaps there's a ghost of the old 0.90 metadata hanging around,
which is confusing grub.
$ sudo mdadm --detail --scan
ARRAY /dev/md0 metadata=1.2 name=eve:0 UUID=98ab8ad1:23e4df2e:d8bb3605:b9be0e1f
$ sudo mount /dev/md0 /mnt/raid
$ sudo mount --bind /dev /mnt/raid/dev
$ sudo mount --bind /dev/pts /mnt/raid/dev/pts
$ sudo mount --bind /proc /mnt/raid/proc
$ sudo mount --bind /sys /mnt/raid/sys
$ sudo chroot /mnt/raid
# ls -l /dev/md*
brw-rw---- 1 root disk 9, 0 2011-02-06 11:14 /dev/md0
# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4]
[raid10]
md0 : active raid5 sdc1[1] sda1[0]
968576000 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
# grub-mkconfig | grep 'set root'
Generating grub.cfg ...
set root='(md/0)'
Found linux image: /boot/vmlinuz-2.6.35-25-generic
Found initrd image: /boot/initrd.img-2.6.35-25-generic
set root='(md/0)'
set root='(md/0)'
Found linux image: /boot/vmlinuz-2.6.35-24-generic
Found initrd image: /boot/initrd.img-2.6.35-24-generic
set root='(md/0)'
set root='(md/0)'
Found linux image: /boot/vmlinuz-2.6.35-23-generic
Found initrd image: /boot/initrd.img-2.6.35-23-generic
set root='(md/0)'
set root='(md/0)'
Found linux image: /boot/vmlinuz-2.6.35-22-generic
Found initrd image: /boot/initrd.img-2.6.35-22-generic
set root='(md/0)'
set root='(md/0)'
Found linux image: /boot/vmlinuz-2.6.32-25-generic
Found initrd image: /boot/initrd.img-2.6.32-25-generic
set root='(md/0)'
set root='(md/0)'
Found memtest86+ image: /boot/memtest86+.bin
set root='(md/0)'
set root='(md/0)'
Found Microsoft Windows XP Home Edition on /dev/sdb1
set root='(hd1,msdos1)'
done
$ lsb_release -rd
Description: Ubuntu 10.10
Release: 10.10
$ apt-cache policy grub-pc mdadm
mdadm:
Installed: 2.6.7.1-1ubuntu16
Candidate: 2.6.7.1-1ubuntu16
Version table:
*** 2.6.7.1-1ubuntu16 0
500 http://mirror.aarnet.edu.au/pub/ubuntu/archive/ maverick/main amd64
Packages
500 http://au.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages
100 /var/lib/dpkg/status
grub-pc:
Installed: 1.98+20100804-5ubuntu3
Candidate: 1.98+20100804-5ubuntu3
Version table:
*** 1.98+20100804-5ubuntu3 0
500 http://mirror.aarnet.edu.au/pub/ubuntu/archive/ maverick/main amd64
Packages
500 http://au.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages
100 /var/lib/dpkg/status
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/713874
Title:
grub misinterprets md/raid device
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