Bug#544731: "error: no such disk" renders system unbootable

[Albin Tonnerre]

On Wed, 02 Sep 2009 20:50 +0200, Albin Tonnerre wrote :
> On Wed, Sep 02, 2009 at 08:26:25PM +0200, Felix Zielcke wrote :
> > Am Mittwoch, den 02.09.2009, 20:23 +0200 schrieb Albin Tonnerre:
> > > [20:20 ~]% sudo grub-probe -t abstraction -d /dev/mapper/lvm-system
> > > lvm
> > > 
> > > > But maybe you're affected by the same problem as in 542435, 544577 and
> > > > 543795 which was actually caused by a change in dmsetup
> > > > Check that the files in /dev/mapper are real devices and no symlinks
> > > > to /dev/dm-X
> > > 
> > > They are real devices :(
> > > 
> > > Regards,
> > 
> > Run `bash -x grub-install --modules=minicmd /dev/sda'
> > the grub-mkimage line should include lvm.
> > and then check on reboot with `lsmod' if lvm is really loaded.
> > `ls' should show the LVs
> 
> Argh. After running apt-get install --reinstall grub-pc, lvm is now listed in
> /boot/grub/grub.cfg, and grub2 is able to boot the system correctly.
> Please don't close the bug, though - this has happened to me several times in
> the past, and running grub-install after a couple grub-pc updates resulted in
> the same kind of error. I absolutely have no clue as to what just happened
> there.

Alright, so this started happening again. I'm using the latest version from
unstable, 1.97-1. Did and apt-get remove --purge grub-common grub-pc, then
removed everything in /boot/grub, and reinstalled.

[20:15 @laptop ~]% cat /boot/grub/device.map 
(hd0)	/dev/sda
[20:15 @laptop ~]% sudo grub-probe -t device /
/dev/mapper/lvm-system
[20:16 @laptop ~]% sudo grub-probe -t abstraction -d /dev/mapper/lvm-system  
grub-probe: error: no mapping exists for `lvm-system'

After adding '(lvm-system) /dev/mapper/lvm-system' to /boot/grub/devices.map:

[20:17 @laptop ~]% sudo grub-probe -t abstraction -d /dev/mapper/lvm-system 
<nothing>

Of course, the generated grub.cfg file doesn't contain any 'insmod lvm'
directive. As previously, the files in /dev/mapper/ are real block devices and
not symlinks. If there's anything I can do to help debug this issue, please let
me know.

Regards,
-- 
Albin Tonnerre
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