Date: Fri, 2 Oct 2015 17:06:41 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: "Chad J. Milios" <milios@ccsys.com> Cc: "William A. Mahaffey III" <wam@hiwaay.net>, FreeBSD Questions !!!! <freebsd-questions@freebsd.org> Subject: Re: Geom question Message-ID: <alpine.BSF.2.20.1510021704110.7062@wonkity.com> In-Reply-To: <560F04A5.1060102@ccsys.com> References: <560EDE45.3040605@hiwaay.net> <3D81C7BC-1A31-4046-88B7-50F25EA3B952@ccsys.com> <560EEE5F.3080904@hiwaay.net> <alpine.BSF.2.20.1510021521390.7062@wonkity.com> <560F04A5.1060102@ccsys.com>
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On Fri, 2 Oct 2015, Chad J. Milios wrote: >> GPT does not work well with that. If the target device is larger, the >> backup GPT that is supposed to go at the very end of the disk ends up >> someplace before that. If the target device is smaller, well, it won't >> work at all. > > he's right. unless your md is exactly the correct total size, to the byte, > the backup GPT header will be lost after copying to a different device. alas, > it is a backup after all, unless/until the primary header suffers calamity, > it'll cause you no grief. Well... due to kern.geom.part.check_integrity defaulting to 1, the system might refuse to boot. Or it might just complain, I forget.
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