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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>
Cc:        miles kuo <miles.kuo@gmail.com>, freebsd-questions@freebsd.org
Subject:   Re: How to mirror the FreeBSD OS on two disks
Message-ID:  <alpine.BSF.2.00.1207110702490.76348@wonkity.com>
In-Reply-To: <CAPj0R5L1=HaY1Bf-51FB59J6Q4pX1s4yDbzXoAAWRwei6yqt-A@mail.gmail.com>
References:  <CAGpP9XOvVor7HmxDP7SFhc7AFnpSf-s%2BgXbkJsguiAo=xNvnVA@mail.gmail.com> <CAPj0R5L1=HaY1Bf-51FB59J6Q4pX1s4yDbzXoAAWRwei6yqt-A@mail.gmail.com>

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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.)



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