I decided to experiment with ubuntu 9.04, having almost always used Red Hat
or CentOS or Fedora beforehand, and I am having a hell of a time getting
the software RAID to cooperate.
I installed ubuntu 9.04 amd64 desktop on a Dell Optiplex 740 with the hack
I found in an ubuntu forum of booting from the cd, installing mdadm, then
running the installer, so it recognizes RAID as an option during the disk
partitioning setup. That I had to do this, where it's out-of-the-box with
any Red Hat or CentOS or Fedora install struck me as bizarre, but whatever.
Anyway, when the grub boot selection is:
title Ubuntu 9.04, kernel 2.6.28-11-generic
root (hd0,2)
kernel /boot/vmlinuz-2.6.28-11-generic root=/dev/md3 ro
quiet splash
initrd /boot/initrd.img-2.6.28-11-generic
it starts to boot, does some schmancy ubuntu splash screen and then states
that it can't find /dev/md3.
When the grub selection is:
title Ubuntu 9.04, kernel 2.6.28-11-generic-sda3
root (hd0,2)
kernel /boot/vmlinuz-2.6.28-11-generic root=/dev/sda3 ro
quiet splash
initrd /boot/initrd.img-2.6.28-11-generic
it comes up with nothing in /proc/mdstat until I run "mdadm --auto-detect".
However, it has dutifully mounted /dev/md3 as /. Problem is, it's only
really using /dev/sda3, but /dev/sdb3 is listed in /proc/mdstat as the only
disk in the mirror. And since /dev/sda3 is really being used as /, I cannot
re-add it to /dev/md3.
Ideas?
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