I never thought I'd say this, but I think it's easier to do this with
GRUB 2. Anyway I did an installation to raid1's in CentOS 6's
installer, which still uses GRUB legacy. I tested removing each of the
two devices and it still boots. These are the commands in its log:
: Running... ['/sbin/grub-install', '--just-copy']
: Running... ['/sbin/grub', '--batch', '--no-floppy',
'--device-map=/boot/grub/device.map']
: grub> device (hd0) /dev/vdb
: grub> root (hd0,1)
: grub> install --stage2=/boot/grub/stage2 /grub/stage1 d (hd0,1)
/grub/stage2 p (hd0,1)/grub/grub.conf
: Running... ['/sbin/grub', '--batch', '--no-floppy',
'--device-map=/boot/grub/device.map']
: grub> root (hd0,1)
: grub> install --stage2=/boot/grub/stage2 /grub/stage1 d (hd0,1)
/grub/stage2 p (hd0,1)/grub/grub.conf
I do not know why there's a duplication of the install command. It
also looks like the way it knows it's supposed to install two
bootloader stage1 and stage2 to two different devices is with
devices (hd0) /dev/vdb
I don't know why the split referencing. (hd0) is /dev/vda and (hd1) is
/dev/vdb. Weird. But it does work.
hd0,1 in my case is /boot, but yours is hd0,0 since it's the first
partition. So anywhere the steps above say hd0,1 you probably need
hd0,0.
Chris Murphy
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