Re: changing the MBR for a dual-bootup system

[jdkaye10@yahoo.es]

Andreas Glaeser wrote:

> On Sun, 2006-10-15 at 18:17 +0200, jdkaye10@yahoo.es wrote:
>> Hi all,
>> I am running Debian Etch 2.6.15-1-686 on an Asus motherboard with an
>> AMD64 chip. Etch is running on /dev/hda. I wanted to try out the 64bit
>> kernel so I installed a second HD /dev/hdb and installed Sid amd64 from
>> scratch. I didn't want to get involved in chroot type stuff which is why
>> I did it this way. Both systems use grub but the MBR is pointing to
>> /dev/hdb for the menu.1st file. When I upgraded the kernel on the Etch
>> 686 system of course I had to copy the newly created menu.1st item from
>> Etch to the menu.1st file on Sid amd64 in order for it to show up on the
>> grub menu on bootup. That was ok for a while but now I'm getting disk
>> errors on /dev/hdb. I can still boot into Etch ok but I would like to
>> change things so that the MBR looks at /dev/hda instead of /dev/hdb. I
>> may have to replace the hdb drive if reformatting and reinstalling Sid
>> amd64 don't clear up the problems.
>> 
>> Can someone tell me how to tell grub to ignore /dev/hdb and look at
>> /dev/hda for the bootup menu?
>> Thanks in advance for any advice.
>> Jonathan
>> 
> Maybe ´grub-install --root-directory=/dev/hda /dev/hda´ has the desired
> effect.
> 
> 
> Regards
Thanks for that Andreas,
I'll give it a try and let you know if it works. I also created a grub boot
disk with stage2_eltorito on it. Would it be better to try it from there?
Cheers,
Jonathan