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Date:      Tue, 07 Feb 2017 18:33:21 +0200
From:      Toomas Soome <tsoome@me.com>
To:        FreeBSD-current@FreeBSD.org
Subject:   Re: gptzfsboot trouble
Message-ID:  <26D78147-119E-4BB7-B567-2B2C09C321BE@me.com>
In-Reply-To: <000d01d2815c$74f1be60$5ed53b20$@btinternet.com>
References:  <000d01d2815c$74f1be60$5ed53b20$@btinternet.com>

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> On 7. veebr 2017, at 18:08, Thomas Sparrevohn =
<Thomas.Sparrevohn@btinternet.com> wrote:
>=20
> Hi all
>=20
>=20
>=20
> Last week I decided to upgrade my FreeBSD installation - it's been a =
while
> (September 16 was last time). Unfortunately CURRENT does not boot and =
cash
> in a weird way. Both 11-RELEASE and 12 CURRENT boot loader seems to =
attempt
> to read blocks that exceeds the physical disk. Initially I through it =
was a
> hard disk error - but after a "oh" experience I realised that the
> "gptzfsboot: error 4 lba 921592" is actually beyond the physical =
boundaries
> of the disk (300GB disk). In order to rule out different options - I
> installed a vanilla 11-RELEASE on the 300G with a simple stripe - it =
also
> gives the error but does boot - the LBA of the error is slightly =
different
> on 11 CURRENT and comes up with LBA 921600
>=20
>=20
>=20
> I have scanned all the disks for physical faults and there seems to be =
none
> and I have tried doing a single disk installation on each disk - they =
give
> the same error - Does anybody have any idea? Included Photos as =
sometimes it
> get through to the actual boot menu but then crash in another place
>=20


The gptzfsboot does read the backup label from the disk and the GPT =
backup label is stored at the end of the disk. The location of the =
backup label is in the primary GPT table, alternate sector field. I =
wonder if that location is somehow set to bad value=E2=80=A6

rgds,
toomas=



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