Re: Grub boot problem ofter FC4 -> FC5 upgrade

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On 10/18/06, Marnix <Fedora@xxxxxxxxxxxx> 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

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