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Date:      Wed, 23 Sep 2009 08:22:03 -0700
From:      Ted Faber <faber@isi.edu>
To:        Dimitry Andric <dimitry@andric.com>
Cc:        freebsd-current@freebsd.org
Subject:   Re: RELENG_8 regression: cannot detect partitions (now with boot -v)
Message-ID:  <20090923152203.GC27328@zod.isi.edu>
In-Reply-To: <20090922184700.GE38036@zod.isi.edu>
References:  <20090921201903.GB52169@zod.isi.edu> <20090922041055.GA29399@zod.isi.edu> <4AB8AB12.7010406@andric.com> <20090922151441.GA38036@zod.isi.edu> <4AB90D2B.30801@andric.com> <20090922184700.GE38036@zod.isi.edu>

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On Tue, Sep 22, 2009 at 11:47:00AM -0700, Ted Faber wrote:
> On Tue, Sep 22, 2009 at 07:45:15PM +0200, Dimitry Andric wrote:
> > On 2009-09-22 17:14, Ted Faber wrote:
> > > That's the USB disk label I was using to get the boot from.  The slic=
es
> > > on ad0: /dev/ad0s1a /dev/ad0s1d and /dev/ad0s1e are the ones I don't
> > > see.
> >=20
> > Just checking. :)  Can you run (from a rescue disk or 7-STABLE):
> >=20
> >   dd if=3D/dev/ad2 count=3D4 2>/dev/null | hexdump -C
> >=20
> > and post the output here?  Output of fdisk and bsdlabel would also be
> > handy.
>=20
> The bsdlabel and fdisk were attached to the first message, but I've
> attached them here as well, along with the output of=20
>=20
> $ dd if=3D/dev/ad0 count=3D4 2>/dev/null | hexdump -C
>=20
> from the running 7.2 install.  7.2 finds the disk as ad0 not ad2.
>=20
> I've also gotten a pointer to this message, which sounds a lot like my
> problem:
>=20
> http://docs.freebsd.org/cgi/getmsg.cgi?fetch=3D774931+0+archive/2009/free=
bsd-current/20090118.freebsd-current
>=20
> I'm planning to save that sector and then try erasing it as the message
> suggests when I get access to the machine tonight.  If the output from
> the dd above will confirm that diagnosis, that would be great.  I don't
> know what a stale disklabel looks like, myself...

Just for the record, clearing the disk label as described above solved
the problem finding partition tables.

--=20
Ted Faber
http://www.isi.edu/~faber           PGP: http://www.isi.edu/~faber/pubkeys.=
asc
Unexpected attachment on this mail? See http://www.isi.edu/~faber/FAQ.html#=
SIG

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