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From: Marcel Moolenaar <xcllnt@mac.com>
To: Dimitry Andric <dimitry@andric.com>
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Date: Thu, 15 Jan 2009 09:00:00 -0800
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Subject: Re: GEOM and moving to CURRENT from 7.1
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On Jan 15, 2009, at 6:15 AM, Dimitry Andric wrote:

> On 2009-01-14 17:34, Marcel Moolenaar wrote:
>>> The only way i've found to boot my system again is to compile a new
>>> kernel with GEOM_BSD and GEOM_MBR, instead of GEOM_PART_*.
>>
>> Wipe out your second sector on the disk. You have a
>> stale BSD disklabel that prevents the MBR from being
>> used.
>
> Hmm, in my case I can't do so, since I have a "Dangerously Dedicated"
> FreeBSD MBR partition.

You don't have a DD installation if your root file system
is mounted on ad0s1a. You have a DD installation if your
root file system is mounted on ad0a.

In the DD case, the BSD disklabel in the 2nd sector is the
one that's being used. In the non-DD case the BSD disklabel
is in the 2nd sector of the first slice (sector 64 on the
disk in the most common case).

-- 
Marcel Moolenaar
xcllnt@mac.com