Re: Linux mdadm superblock question.

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On Sat, Feb 13, 2010 at 1:35 AM, Giovanni Tessore <giotex@xxxxxxxxxx> wrote:
>
>>> I recently reinstalled my systems, and I had to use superblock 0.9 to be
>>> able to boot ext4 from raid-1 (kernel 2.6.31 - grub2 1.97-beta4).
>>> I didn't go deep with it as I was quite in hurry, so I'm not sure if it
>>> depends by grub2 or by kernel's md autodetection at boot.
>>> I used superblock 1.1 for the others md devices.
>>>
>>> ...
>>
>> mdadm 1.0 block devices, since stored at the end, can still be used
>> /read only/ the same way that 0.90 devices were used before grub knew
>> how to talk to them.  By looking at the underlying block devices and
>> ignoring their tails.  This does however only hold for raid-1 layouts
>> with the 1.0 or 0.90 format labels.
>
> I guessed so, infact I created superblock 1.0 for the raid-1 devices md0
> (root) and md1 (swap), while 1.1 for the others .. but it didn't work and I
> had to revert to 0.9 for root and swap ...
>
> Regards
>
> --
> Cordiali saluti.
> Yours faithfully.
>
> Giovanni Tessore
>
>
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Just a guess, but did you tell grub root was /dev/md0 or did you say
root was /dev/sd(whatever backs md0) ?
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