Fwd: grub-probe seems to be having problems

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Any takers?  -John

----- Forwarded Message -----
From: "Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@xxxxxxxxx>
To: "Lennart Sorensen" <lsorense@xxxxxxxxxxxxxxxxxxx>
Cc: "The development of GRUB 2" <grub-devel@xxxxxxx>, "Marco d'Itri" <md@xxxxxxxx>
Sent: Tuesday, March 20, 2012 6:28:18 AM
Subject: Re: grub-probe seems to be having problems

On 19.03.2012 22:28, Lennart Sorensen wrote:
> On Fri, Mar 09, 2012 at 03:37:57PM -0500, Lennart Sorensen wrote:
>> Interestingly after poking at reading all the disks and poking mdadm
>> --examine and --detail, now grub-prob likes md1, but still dislikes md0.
>> root@rceng03new:/tmp# /usr/sbin/grub-probe --device-map= --target=abstraction --device /dev/md1
>> diskfilter mdraid1x raid5rec
>> root@rceng03new:/tmp# /usr/sbin/grub-probe --device-map= --target=abstraction --device /dev/md0
>> /usr/sbin/grub-probe: error: Couldn't find physical volume `(null)'. Check your device.map.
>> md1 was failing before with the same grub code.
>> I don't get it.  I wonder if there is any known issues in 2.6.32 kernel
>> and/or mdadm - v3.1.4 - 31st August 2010
> Any suggestion for how to try and debug this myself, like which
> file/function to start debuging at?  I would like to put this machine
> in to production use soon, but I would also like to take this chance to
> fix the bug in grub first.

There is no need to debug. I know exactly why GRUB is confused: because 
as far as my understanding goes the superblock makes no sense (details 
in previous mail). What we need is that someone familiar with md tells 
me how this sector should be interpreted.

Vladimir 'φ-coder/phcoder' Serbinenko

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