setup-storage and grub issue

[Michael Tautschnig]

> Michael Tautschnig wrote:
> >> I started playing around with setup-storage to setup a
> >> lvm-on-raid1-2disk box. setup-storage really works out fine, but grub
> >> installation fails, apparently because the $BOOT_DEVICE is set nowhere.
> >> disk_var.sh only defines $SWAP_LIST and $ROOT_PARTITION
> >>     
> > Hmm, yes, $BOOT_* only get defined in case they reside on a normal partition. I
> > think I can easily fix this if you can give me a hint what they should be set to
> > in this case. Ok, $BOOT_PARTITION is obvious, but what should $BOOT_DEVICE be
> > set to? I'm lacking the knowledge about RAID&grub, apparently. Could you help me
> > out?
> >   
> I haven't figured out the proper method yet.
> Anyhow installing grub in the MBR of disk1 is sufficient to boot the
> installed system.
> So in my case BOOT_DEVICE should be /dev/sda.
> 
> But to boot in case of a failure of the primary disk, grub has to be
> installed to the MBR of disk2 also. Obviously this will only work for
> RAID1. Additionally some howtos suggest a kind of device swap magic to
> make grub think that disk2 is disk1 on install.
> 
> Also menu.lst needs to be modified to contain a fallback entry that
> boots from disk2. This will have to be updated by hand on every kernel
> upgrade - unless update-grub will be patched to handle such RAID setups.
> 
> Finally mdadm has to be on the package list for the installed system.
> Then the created initramfs will happily boot from the RAID1 rootfs
> without further intervention. This should probably be mentioned in the wiki.
>

Hmm, ok, this is not as straightforward as I hoped. I need to look into this
more thoroughly, but this will take some time.

Until then I suggest you modify the GRUB/* scripts such as to work without the
BOOT_DEVICE/BOOT_PARTITION information, which I guess will be quite a quick fix.

Sorry,
Michael

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