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Old 11-02-2007, 01:29 PM   #1
Registered: Oct 2003
Location: Tucson
Distribution: Fedora, RHEL 5
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SOLVED: Trying to rescue grub on NVIDIA RAID and Fedora 7


I have a computer running Nvidia Raid 0. had to reinstall windows and so i wanted to use the rescue cd for my distro (Fedoar 7) to reinstall grub.

Normally, I would do this:

#root (hd0,1)
#setup (hd0)
However this is not working. I am guessing it has to do with the Nvidia raid mapping system but i am not sure. In my grub configuration root shows up as (hd0,1) but for some reason grub won't accept it giving errors such as unknown device or filesystems. I will try to get the exact errors.

/boot is /dev/mapper/nvidia_ahdjiajcp3

has anyone ever successfully reinstalled grub in this scenario?

Thanks in advance

Last edited by cuco76; 11-04-2007 at 10:52 AM.
Old 11-02-2007, 01:50 PM   #2
Registered: Oct 2003
Location: Tucson
Distribution: Fedora, RHEL 5
Posts: 220

Original Poster
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OK so here are some exact error messages:

root (hd0,1)
filesystem type unknown, partition type 0x83
setup (hd0)
error 17 Cannot mount selected partition
root (hd0,0) gives 0x7 and (hd0,2) gives 0x7 partition types with the same setup error.

if i try to do: (from memory)
root (hd1,anything)
cannot mount selected something
hope this clarifies
Old 11-02-2007, 07:49 PM   #3
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Registered: Sep 2003
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grub.conf? What is that?

I do believe that your /boot has to be on a partition that is not part of the raid, if you are using software raid or LVM.

The easiest way to find it is to just do an fdisk -l on your drives, and we'll see what that turns up.
Old 11-04-2007, 10:51 AM   #4
Registered: Oct 2003
Location: Tucson
Distribution: Fedora, RHEL 5
Posts: 220

Original Poster
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OK so i got it figured out. The reason it worked is unknown to me. However it seems that when your system is using /dev/mapper's instead of /dev/hd* to point to your hardware you have to tell grub that this is the case.

I found this because from the rescue env. a fdisk -l shows up with errors until i pointed it to /dev/mapper/nvidia_whatever.

So i ran "grub --device-map=/boot/grub/" and then was able to restore grub to my mbr. I guess by default grub tries to connect to /dev/hda or sda.

Anyways hope this helps someone else out.
Old 11-04-2007, 11:15 AM   #5
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Distribution: Mac OS X Leopard 10.6.2, Windows 2003 Server/Vista/7/XP/2000/NT/98, Ubuntux64, CentOS4.8/5.4
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Thanks for posting the solution. This will come in handy for other people. I guarantee it


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