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Date:      Thu, 15 Jan 2009 20:24:58 +0100
From:      Dimitry Andric <dimitry@andric.com>
To:        Marcel Moolenaar <xcllnt@mac.com>
Cc:        Randy Bush <randy@psg.com>, Luiz Otavio O Souza <lists.br@gmail.com>, George Neville-Neil <gnn@neville-neil.com>, Ben Kaduk <minimarmot@gmail.com>, current@freebsd.org
Subject:   Re: GEOM and moving to CURRENT from 7.1
Message-ID:  <496F8D8A.1060508@andric.com>
In-Reply-To: <A8E47805-888E-4282-8623-72A65B593D47@mac.com>
References:  <FC3D3CF7-091B-4ECF-BE38-6C7751C20994@neville-neil.com> <alpine.BSF.2.00.0901112002080.3696@ibyngvyr.purzvxnyf.bet> <496D0364.2060505@psg.com> <47d0403c0901131335h46e7b151p3768de9a3e2c2027@mail.gmail.com> <EC370904A7B74B93887C79E120CA2835@adnote989> <085BEE07-BAE5-4A45-A14D-9587987FAA5C@mac.com> <496F44FA.1070004@andric.com> <48C1C477-B7BE-43B0-AC57-9DEB7BF9AA88@mac.com> <496F7347.4060007@andric.com> <A8E47805-888E-4282-8623-72A65B593D47@mac.com>

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On 2009-01-15 19:05, Marcel Moolenaar wrote:
>> Hmm, strangely enough I have multiple systems which really do use ad0s1
>> while installed DD using sysinstall, and have been using that since years...
> This is a problem with sysinstall. It looks like DD is broken.
> MBR partitions are always created.

Indeed, and the MBR itself is filled with /boot/boot1, plus a partition
table.  It is possible this was done to appease some PC BIOSes, because
some of those refuse to boot, if there is no "valid" MBR with an active
partition...


> GEOM_PART correctly uses the
> BSD disklabel that's in the 2nd sector, but GEOM_MBR claims the
> MBR being unaware that the disk is DD.

But how can this be, if I don't have GEOM_MBR in my kernel config?  (I'm
using GENERIC, in fact.)


> libdisk is broken in that it should
> not create MBR slices for DD configurations to begin with...

As stated above, this might be on purpose; enough braindead BIOSes out
there... :)



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