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Sender: Alexander Motin <mavbsd@gmail.com>
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Date: Tue, 24 Jan 2012 01:51:38 +0200
From: Alexander Motin <mav@FreeBSD.org>
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To: Devin Teske <devin.teske@fisglobal.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Parallels v4 regression (aka ada(4) oddity) in RELENG_9
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On 01/23/12 20:06, Devin Teske wrote:
> I have a Parallels virtual machine and it runs FreeBSD 4 through 8 just
> swimmingly.
>
> However, in RELENG_9 I notice something different. My once "ad0" is now showing
> up as "ada0". However, something even stranger is that devfs is providing both
> ad0 family devices AND ada0 family devices.

That is compatibility shims. You can disable them if you want by adding 
to /boot/loader.conf line: kern.cam.ada.legacy_aliases=0

-- 
Alexander Motin