From owner-freebsd-geom@FreeBSD.ORG  Tue Jan 31 16:52:28 2012
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Date: Tue, 31 Jan 2012 11:52:26 -0500
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From: Vick Khera <vivek@khera.org>
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Subject: Re: gmirror failed with error 19.
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On Tue, Jan 31, 2012 at 8:15 AM, Vick Khera <vivek@khera.org> wrote:
> My solution was to re-break the gmirror from FreeBSD 8 kernel, boot
> into FreeBSD 9 kernel and world, then reformat the second drive using
> GPT, dump/restore from first drive, boot to second drive, reformat
> first drive, set up gmirror per partition, then reboot.

My step-by-step is posted. Hope it helps someone get over the busted
gmirror situation where you get this error:

GEOM_PART: integrity check failed (mirror/gm0, MBR)

http://vivek.khera.org/mini-blog/upgradefreebsd82to90withgmirrorbootdisk