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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "Karl Denninger" <karl@denninger.net>,
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Subject: Re: MPS
Date: Tue, 30 Sep 2014 14:17:02 +0100
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----- Original Message ----- 
From: "Karl Denninger" <karl@denninger.net>

> I'd like to understand this, because I've had some trouble trying to
> convert on a running machine.  Specifically, I've had instances where
> adding labels to existing packs (using gpart modify...) and then
> destroying the glabel labels results in ZFS identifying pool members
> with their uuid instead of the label -- permanently!

ZFS persists out the data its using when changing various things but
you can disable gptid's yes with:
/boot/loader.conf
kern.geom.label.gptid.enable="0"