Bug#668920: grub-pc: grub 1.99-21 fails to detect mdraid partitions

[Arne Goetje]

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On 04/16/2012 03:56 PM, Colin Watson wrote:
> On Mon, Apr 16, 2012 at 12:17:59AM +0800, Arne Goetje wrote:
>> Upgrading from 1.99-17 to 1.99-21 on wheezy today renders the
>> system unbootable. Grub cannot detect any mdraid partition and is
>> therefor unable to load the kernel.
> 
> Does it emit any error messages that might be useful to help us
> track this down?

Error message for each HD is "error: no such partition".
Since I have 4 HDs, the message appears 4 times.

>> Downgrading to 1.99-17 solves the problem.
> [...]
>> *********************** BEGIN /proc/mdstat Personalities :
>> [raid1] md1 : active raid1 sdc[0] sdd[1] 488386496 blocks [2/2]
>> [UU] md127 : active raid1 sda[0] sdb[1] 488386496 blocks [2/2]
>> [UU] unused devices: <none> *********************** END
>> /proc/mdstat
> [...]
>> * grub-pc/install_devices: /dev/sdc
> 
> This jumped out at me.  Are you quite sure that your BIOS is
> actually booting from /dev/sdc?  It's possible that it's attempting
> to boot from an old copy of the GRUB core image installed to a
> different disk, which then gets confused by the newer modules in
> /boot/grub/.  In this theory, downgrading to 1.99-17 would help
> because perhaps that core image is ABI-compatible with those
> modules; the support for non-512-byte sectors in 1.99-19 was
> probably a core/modules ABI break so this is plausible enough.
> 
> My standard advice is to install GRUB to all fixed disks 
> ('dpkg-reconfigure grub-pc') unless you have a good reason not to.

I remember I installed grub on all disks when I set up the machine.
However, 'dpkg-reconfigure grub-pc' doesn't give me any option to
configure that any more. I tried a manual 'grub-setup /dev/md127 ;
grub-setup /dev/md1' after installing the new version, but it didn't
help. grub-setup doesn't let me install on /dev/sd*, since the disks
are grouped into raid arrays now.

The boot device is /dev/md127 and the root partition /dev/md127p1.
(Itʼs named md127, because when I installed squeeze on the machine, I
chose the name md0 for the first raid array, not knowing that it would
secretly rename it to md127, since it somehow doesn't like the
numbering start from 0.)

Attached is my grub.cfg

HTH

Cheers
Arne
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