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Re: raid 1

On Wed, Jul 18, 2007 at 04:23:38PM -0700, Mike Bird wrote:
> On Wednesday 18 July 2007 15:50, besonen wrote:
> > is it true that with software raid 1 that i cannot have the boot drive
> > protected?
> No.  However, getting the mirror of the boot drive to be bootable
> under grub in readiness for when the boot drive fails does not seem
> to me to be quite as easy/reliable as it was under LILO.  Maybe a
> grub expert can post a reliable recipe here.

hmmm... my system boots from grub just fine with no magic. This is
using a raid1 /boot partition mirrored over 4 drives (for
convenience). I can manually edit the boot stanzas to boot from any of
the partitions in that array and it works fine. 

my grub stanza

title           Xen 3.0.3-1-i386 / Debian GNU/Linux, kernel
root            (hd0,0)
kernel          /xen-3.0.3-1-i386.gz
module          /vmlinuz-2.6.18-4-xen-686 root=/dev/md1 ro
console=tty0 pciback.hide=(0000:02:08.0)
module          /initrd.img-2.6.18-4-xen-686

note the root line (hd0,0). that could just as easily be (hd1,0) or
(hd2,0) or (hd3,0). I know I tested it when I built the array, but now
you've got me worried that maybe it doesn't work. ack. 

my pertinent array looks like this:

md0 : active raid1 hda1[0] hde1[3] hdg1[2] hdc1[1]
      248896 blocks [4/4] [UUUU]

and is mounted on /boot.

Am I missing something?


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