From owner-freebsd-hackers@FreeBSD.ORG  Fri Jan 14 10:51:58 2011
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Date: Fri, 14 Jan 2011 13:51:56 +0300
From: "Andrey V. Elsukov" <bu7cher@yandex.ru>
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To: Daniel Braniss <danny@cs.huji.ac.il>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: more gpart/glabel problems
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On 14.01.2011 13:37, Daniel Braniss wrote:
> and on the console:
> 	GEOM: mfid0: the secondary GPT table is corrupt or invalid.
> 	GEOM: mfid0: using the primary only -- recovery suggested.
> 	GEOM: mfid0: the secondary GPT table is corrupt or invalid.
> 	GEOM: mfid0: using the primary only -- recovery suggested.
> 	GEOM: label/r0: corrupt or invalid GPT detected.
> 	GEOM: label/r0: GPT rejected -- may not be recoverable.
> 
> BTW, going the MBR way, it works as expected.
> 
> so what am I doing wrong?

GLABEL saves his metadata in the last sector of the given provider
where secondary GPT is located. You can label mfid0 with glabel and
after that create GPT on top of label/r0. This should work.

-- 
WBR, Andrey V. Elsukov