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Date:      Tue, 13 Mar 2007 12:21:17 -0700
From:      Chuck Swiger <cswiger@mac.com>
To:        Steve Franks <stevefranks@ieee.org>
Cc:        User Questions <freebsd-questions@freebsd.org>
Subject:   Re: mirror without destroying existing contents
Message-ID:  <C006858A-710F-49F0-8EB8-068C29CC2BF7@mac.com>
In-Reply-To: <539c60b90703131212m731986b1p8603a86eca00d6b2@mail.gmail.com>
References:  <539c60b90703131212m731986b1p8603a86eca00d6b2@mail.gmail.com>

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On Mar 13, 2007, at 12:12 PM, Steve Franks wrote:
> Anyone made a mirror w/o destroying what's in the disk already?  The
> atacontrol man page is less than adequate in this respect...is is even
> possible?

Oh, yes-- it's certainly possible to create a mirror with live data,  
but one is advised to be cautious and have a full backup available in  
case of problems.  With hardware-based ATA controllers like Promise,  
3ware, etc, they should have a BIOS utility which you can use to  
create the mirror-- make sure to add the drive with valid data first,  
and then add the second or additional drives to the mirror set.

The same approach ought to work with software-mirroring such as (g) 
vinum.

-- 
-Chuck




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