Grub boot problem ofter FC4 -> FC5 upgrade

[Tod Merley]

On 10/18/06, Marnix <Fedora at harssema.com> wrote:
> Hi,
>
> After an unsuccesfull FC4 -> FC5 upgrade I find myself in the
> following situation:
>
> My server has two IDE disks hda and hdc. When it boots I see "GRUB"
> alone on the screen and then it stops. I think that means that grub is
> not able to find stage1_5 or stage2 loader. Grub used to be installed
> (FC4) on a seperate /boot partition which was a metadevice md3
> mirrored on two devices: hda1 and hdc1. When I boot from rescue CD and
> I and try to reïnstall grub on hda I get an error message:
>
> # grub --no-floppy
> grub> find /grub/stage1
>  (hd0,0)
>  (hd1,0)
>
> grub> root (hd0,0)
>  Filesystem type is ext2fs, partition type 0xfd
>
> grub> setup (hd0)
>  Checking if "/boot/grub/stage1" exists... no
>  Checking if "/grub/stage1" exists... yes
>  Checking if "/grub/stage2" exists... yes
>  Checking if "/grub/e2fs_stage1_5"" exists... yes
>  Running "embed /grub/e2fs_stage1_5 (hd0)"... 15 sectors are embedded. succeeded
>  Runing "install /grub/stage1 (hd0) (hd0)1+15 p (hd0,0)/grub/stage2
> /grub/grub.conf"... failed
>
> Error 22: No such partition
>
> I tried swapping the 2 disks, turning hda into hdc and vice versa, but
> then the word "GRUB" does not even appear on the screen, so probably
> hdc does not have an MBR at all.
>
> I want to be very carefull with hdc because I know it still contains
> all filesystems with all data, because these are mounted as
> metadevices under /mnt/sysimage when running from rescue CD.
>
> What should I do next?
>
> Cheers,
> Marnix
>
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Hi Marnix!

Frankly GRUB + RAID is an interesting area, and frankly beyond me.

I would be tempted to establish a separate non-raid disk (what you are
trying to do?).   If the disk was RAID then perhaps that is somehow
reflected in the partition table and perhaps affects how GRUB can find
stage 1.5.

I would be googleing "GRUB RAID" and comeing to understand superblocks.

Good Hunting!

Tod