Bug#422851: grub-pc: Configuration fails if there is no /dev/fd0

[Sam Morris]

On Wed, 2007-05-09 at 17:16 +0200, Robert Millan wrote:
> On Wed, May 09, 2007 at 03:02:48PM +0100, Sam Morris wrote:
> > 
> > Yes, "grub-probe: error: Cannot detect partition map for md0". The
> > message doesn't appear when grub-pc's postinst is run, however.
> > 
> > > Also, what is the result of "parted /dev/md0 print" ?
> > 
> >         Disk /dev/md0: 300GB
> >         Sector size (logical/physical): 512B/512B
> >         Partition Table: loop
>                            ^^^^
> This means there's indeed no partition table, just a filesystem.
> 
> Did you install Debian on purpose without creating any partition table, or is
> this just the normal result when using software RAID?  What does parted say
> about your real disk(s)?

Interesting. This system has been installed for quite a few years; I
moved it to raid1 by hand.

The system has several disks; md0 consists of hdb2 and hdg2. Here's what
parted says about hdb:

        Disk /dev/hdb: 300GB
        Sector size (logical/physical): 512B/512B
        Partition Table: msdos
        
        Number  Start   End    Size   Type     File system  Flags
         1      32.3kB  543MB  543MB  primary                    
         2      543MB   300GB  300GB  primary  ext3         raid 

When you say there is no partition table, I guess you mean inside md0
itself? AFAIR, the array was created before partitionable md arrays were
added to Linux... or at least before mdadm had the option to create
them.

I just ran this on a system that uses RAID which I created with the etch
installer:

        Disk /dev/md8: 57.5MB
        Sector size (logical/physical): 512B/512B
        Partition Table: loop
        
        Number  Start   End     Size    File system  Flags
         1      0.00kB  57.5MB  57.5MB  ext3              

Which appears to confirm my belief that partitionable arrays are unusual
rather than the default.

-- 
Sam Morris
http://robots.org.uk/

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