Fwd: Re: Grub not working under software RAID

["Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>]

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Forwarding for reference.

-------- Original Message --------
Subject:     Re: Grub not working under software RAID
Date:     Fri, 01 Apr 2011 11:23:37 -0400
From:     Sean Porth <sporth@tortus.com>
To:     Vladimir 'φ-coder/phcoder' Serbinenko <phcoder@gmail.com>





On 04/01/11 11:07, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
> On 01.04.2011 16:59, Sean Porth wrote:
>> backup:~# cat /proc/mdstat
>>>> Personalities : [linear] [raid1]
>>>> md1 : active raid1 sdb3[1] sda3[0]
>>>>       945513536 blocks [2/2] [UU]
>>>>
>>>> md0 : active raid1 sdb1[1] sda1[0]
>>>>       29294400 blocks [2/2] [UU]
>>
> How do you access those disks? Do you have /dev/sd[ab][13]. Is it some
> kind of VM? If none of /dev/sd[ab][13] /dev/sd[ab] exist it probably
> means that there is a bug in udev. Mdraid detection is probably done in
> kernel and so presence of nodes under /dev is irrelevant. But any action
> attempted with devices from userspace is obviously bound to fail.
>

I manually created the device nodes for /dev/sda and /dev/sdb.  I then
reran grub-mkdevicemap and now the device.map had devices in it.
Rerunning grub-install /dev/md0  now reports no errors.

So it does seem to be a bug with udev and the squeeze upgrade so I'll
move this over to a Debian bug.

Thanks for your help!





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