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Date: Mon, 03 Dec 2012 19:47:10 +0100
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Jason Usher <jusher71@yahoo.com>
Subject: Re: appropriate list for graid/ataraid questions ?
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Jason Usher wrote:
> Hello,
>
> I have a question or two about graid and ataraid (specifically, migrating a ataraid system to graid) and I wonder where I should post that ?
>
> I've posted to both -questions and -fs but gotten no responses.

Maybe freebsd-geom would be better.

I read your original question on the -fs. I don't have any experiences 
with graid and only few with ataraid. We used gmirror instead, because 
it is more universal (supporting migration of disks between different 
machines)
Anyway - I think it can be possible to use graid with existing data, 
because both should use the same metadata format (depending on HW / BIOS 
manufacturer).

You can try it with some FreeBSD 9 Live CD / USB booted system with a 
custom kernel (without ataraid support) and with graid loaded as a 
module. Then you will see if your existing array will be recognized or not.

Miroslav Lachman

PS: don't try it on a production system without proper backup of your 
valuable data.