How to mirror the FreeBSD OS on two disks

Warren Block wblock at
Wed Jul 11 13:16:46 UTC 2012

On Wed, 11 Jul 2012, Kaya Saman wrote:

> On Wed, Jul 11, 2012 at 10:18 AM, miles kuo <miles.kuo at> 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:

The procedure shown there produces a mirror that will not boot on 
FreeBSD 9.  The release notes mention a workaround:

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

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