From owner-freebsd-current  Sat Nov  2  8: 2:21 2002
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Date: Sun, 3 Nov 2002 03:13:23 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: "Andrey A. Chernov" <ache@nagual.pp.ru>
Cc: current@FreeBSD.ORG, <phk@FreeBSD.ORG>
Subject: Re: GEOM gets whole disk geometry for slice (instead of slice
 geometry)
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On Sat, 2 Nov 2002, Andrey A. Chernov wrote:

> On Sun, Oct 27, 2002 at 03:37:47 +0300, Andrey A. Chernov wrote:
> > I have disk shared between FreeBSD and M$ Win, two slices, and got
> > incorrect disklabel with GEOM kernel. Namely "cylinders" and
> > "sectors/unit" fields are from _whole_ disk, not from just requested
> > slice.
>
> Just found more brokeness: 'disklabel -r ad0s1' and 'disklabel ad0s1'
> shows different results, for -r case 63 added to "offset" field of all a,
> b and c partitions.

This is because -r causes the raw disk to be read and written, and GEOM is
missing the i/o-snooping code that adjusts the offsets even if the labels
are accessed by reading and writing the raw disk.

> BTW, is there is a way to turn GEOM off, something like NOGEOM kernel
> option? I want my old good disklabel back.

Just NO_GEOM.

Bruce


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