Bug#491977: grub-probe fails with "Cannot find a GRUB drive for /dev/dm-N."

[Moritz Naumann]

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Robert Millan wrote:
> Please try:
> 
>   mdadm -D -b /dev/md0
>   mdadm -D /dev/md0

> debby:~# mdadm -D -b /dev/md0
> ARRAY /dev/md0 level=raid1 num-devices=1 spares=1 UUID=b36bed37:7b1ca284:5f985e7d:0ec83b51

> debby:~# mdadm -D /dev/md0
> /dev/md0:
>         Version : 00.90.03
>   Creation Time : Thu Jun 16 19:10:19 2005
>      Raid Level : raid1
>      Array Size : 192640 (188.16 MiB 197.26 MB)
>   Used Dev Size : 192640 (188.16 MiB 197.26 MB)
>    Raid Devices : 1
>   Total Devices : 2
> Preferred Minor : 0
>     Persistence : Superblock is persistent
> 
>     Update Time : Mon Jul 28 22:24:03 2008
>           State : clean
>  Active Devices : 1
> Working Devices : 2
>  Failed Devices : 0
>   Spare Devices : 1
> 
>            UUID : b36bed37:7b1ca284:5f985e7d:0ec83b51
>          Events : 0.12672
> 
>     Number   Major   Minor   RaidDevice State
>        0     254        5        0      active sync   /dev/dm-5
> 
>        1     254        2        -      spare   /dev/dm-2
> debby:~# 

I'm aware this is a silly configuration, 1 active device 1 spare with a
total of two devices. So, while this configuration neither gives me
redundancy nor speedy access it is still a perfectly legal configuration
as per mdraid. I didn't think of wheter or not this could be the cause
of the grub problems until now.

> also check if the problem disappears with older versions of the mdadm package
> (e.g. the one in etch).

I'll do this next if you think the above is not causing the grub issues.

Thanks for all your help.

Moritz
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