Re: GRUB2 hangs on "GRUB Loading."

[Michael Evans]

On Fri, Apr 16, 2010 at 4:49 AM, Kim Eik <address@hidden> wrote:
> I have been running a server for about half a year. And i have restarted the
> machine countless times w/o any problems. However two days ago, grub stopped
> working.
>
> The machine is running ubuntu server 9.10, i have two physical disks
> mirrored with sw raid and several lvm partitions on top. The machine is also
> running ACHI.
>
> I have booted the system using a usb pendrive with ubuntu-alternate, and
> reinstalled grub from a chrooted environment. But sadly to no effect.
>
> I have also tried installing grub to the mbr of both disks and booting from
> each of them. Also without any effect.
>
> I do however have a hunch that the fault may lie in a dist-upgrade from
> somewhere between my previous successfull boot and now. So i am gonna try to
> see if i can rollback some installed software and see if this fixes grub.
>
> Is there anything you guuys can suggest that i do? I am not very familiar
> with the inner workings of grub2 so any help is appreciated.
>
> Thanks
> -Kim
>
>
> _______________________________________________
> Help-grub mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/help-grub
>

Booting from a USB drive, or any other 'hard disk emulation mode'
device will cause your bios-disk order to be detected different when
running grub than it will be during a normal operation.

You probably need to look in to manually editing /boot/grub/device.map
(google for it) and specifying the proper bios-disk mapping.  Whatever
disk your bios is trying to boot off of will be hd0; there is usually
no solid standard for the other devices, but they MAY be stable for a
single bios version on a single system.