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To: Dimitry Andric <dimitry@andric.com>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Tue, 21 Oct 2003 20:17:24 +0200."
             <13041066290.20031021201724@andric.com> 
Date: Tue, 21 Oct 2003 20:28:10 +0200
Message-ID: <11801.1066760890@critter.freebsd.dk>
cc: FreeBSD-Current List <freebsd-current@freebsd.org>
Subject: Re: MBR zapped when panicking? 
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In message <13041066290.20031021201724@andric.com>, Dimitry Andric writes:

>Note that all disks in this machine are Dangerously Dedicated (see
>attached fdisk-ad[023].txt). I hope that's not totally unsupported,
>but what I do observe is that all these DD partitions seem to start at
>offset 0 instead of 1, thereby making the MBR actually part of the
>partition itself. Could this be a reason for something (GEOM?)
>stomping over the MBR when the box panics?

Well, GEOM is no more likely to stomp on anything than your average
filesystem.  Less in fact because GEOM does not originate I/O request,
only pass them through.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.