From owner-freebsd-geom@FreeBSD.ORG  Sat Sep  8 19:42:01 2012
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From: Nicola Tiling <nti@w4w.net>
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Date: Sat, 8 Sep 2012 21:41:51 +0200
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To: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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Subject: Re: GPT partitions missing, upgrading 7.4 to 8.3
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I've build a new kernel with

nooptions   GEOM_PART_BSD
nooptions   GEOM_PART_EBR
nooptions   GEOM_PART_EBR_COMPAT
nooptions   GEOM_PART_MBR
options     GEOM_BSD
options     GEOM_LABEL
options     GEOM_PART_GPT
options     GEOM_MBR

Now my gpt partitions are seen under 8.3 :-) I'm unsure wether to use =
GEOM_BSD or GEOM_PART_BSD - but it works.

Thanks - Nicola

>> GEOM_PART_GPT cannot be nested.
>> You should backup your data and recreate your partitions, then =
restore the data.
>>=20
>> The hackish way: you can remove GEOM_PART_MBR and GEOM_PART_EBR from =
your kernel config,
>> and use GEOM_MBR instead. But you can still use GEOM_PART_GPT. In =
this case GEOM_PART_GPT will be
>> attached to the GEOM_MBR provider and nesting will not be detected.
>>=20
>> --=20
>> WBR, Andrey V. Elsukov