From owner-freebsd-hackers@FreeBSD.ORG  Sun Jun  1 01:57:35 2014
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Date: Sat, 31 May 2014 18:57:34 -0700
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Subject: Re: fdisk(8) vs gpart(8), and gnop
From: Freddie Cash <fjwcash@gmail.com>
To: "Michael W. Lucas" <mwlucas@michaelwlucas.com>
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There's a sysctl where you can set the minimum ashift for zfs. Then you
never need to use gnop.

I believe it's part of 10.0?