From owner-freebsd-questions@FreeBSD.ORG  Wed Jul 11 13:16:46 2012
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Date: Wed, 11 Jul 2012 07:16:45 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Kaya Saman <kayasaman@gmail.com>
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	(wonkity.com [127.0.0.1]); Wed, 11 Jul 2012 07:16:45 -0600 (MDT)
Cc: miles kuo <miles.kuo@gmail.com>, freebsd-questions@freebsd.org
Subject: Re: How to mirror the FreeBSD OS on two disks
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On Wed, 11 Jul 2012, Kaya Saman wrote:

> On Wed, Jul 11, 2012 at 10:18 AM, miles kuo <miles.kuo@gmail.com> wrote:
>> Hi all,
>>
>> I have two SAS disks for the FreeBSD install. I want to install the freeBSD
>> on one disk and mirror to another disk. Just like the AIX Mirror.
>>
>> Any changes will sync between the two disks. And if  one disk crashed or
>> disconnected, the OS could continue running on another disk.
>>
>> Does the FreeBSD support the disk mirror? How to implement it?
>
> I am no expert at this however a quick Google search comes up with:
>
> http://www.freebsd.org/doc/handbook/geom-mirror.html

The procedure shown there produces a mirror that will not boot on 
FreeBSD 9.  The release notes mention a workaround:
http://www.freebsd.org/releases/9.0R/relnotes-detailed.html#AEN1277

(There's work under way to fix that chapter.)