I'm not sure if this is a GRUB2 problem or a RAID/MD issue but here goes...
I want to set up a machine that will boot two Linux installations using
raid 1 partitions and Windows XP on a single partition.
I have two identical disks partitioned as follows
$ cat /proc/partitions
major minor #blocks name
8 0 244198584 sda
8 1 30720000 sda1
8 2 30720000 sda2
8 3 40960000 sda3
8 4 1 sda4
8 5 4194304 sda5
8 6 137601024 sda6
8 16 244198584 sdb
8 17 30720000 sdb1
8 18 30720000 sdb2
8 19 40960000 sdb3
8 20 1 sdb4
8 21 4194304 sdb5
8 22 137601024 sdb6
I installed WinXP first in sda3.
I then installed Ubuntu 11.04 from the Alternate CD and created some
raid1 devices
md0 sda1 sdb1 /
md1 sda5 sdb5 swap
md2 sda6 sdb6 /home
I set the boot flag on sda1 and sdb1.
This worked a treat. I could boot in to either Ubuntu 11.04 to WinXP.
I tested the RAID1 (power down, unplug a disk, power up, power down,
replug the disk, power up, use 'mdadm --add' to rebuild the array).
Brilliant.
Then I installed Xubuntu 11.10 from the Alternate CD. For this install
I created one new raid1 device (md3) and reused md1 and md2
md3 sda2 sdb2 /
md1 sda5 sdb5 swap
md2 sda6 sdb6 /home
I set the boot flag on sda2 and sdb2.
After the install had completed and grub2 had built the grub.cfg I only
had my new Xubuntu 11.10 in the boot menu. The Xubuntu 11.10 install
works perfectly (and I can boot in to Win XP) but I can't boot in to the
Ubuntu 11.04 installation. I've re-run 'update-grub' but it doesn't
find the other installation.
If I run 'sudo mount /dev/md0 /mnt' I can access the Ubuntu 11.04 files.
Is my intended configuration (tri-boot with two raid1, partition based,
Linux installations and XP on a single parition) unachievable?
Gav
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