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Date: Mon, 15 Jun 2009 14:13:59 +1000
From: Emil Mikulic <emikulic@gmail.com>
To: freebsd-stable@freebsd.org
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Subject: Re: Does this disk/filesystem layout look sane to you?
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On Sun, Jun 14, 2009 at 07:16:52PM -0700, Freddie Cash wrote:
> I don't know for sure if it's the same on FreeBSD, but on Solaris, ZFS will
> disable the onboard disk cache if the vdevs are not whole disks.

pjd@ has stated in the past that this doesn't apply to FreeBSD:
http://lists.freebsd.org/pipermail/freebsd-stable/2008-May/042734.html