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Date: Fri, 18 Aug 2006 22:58:22 +0000
From: Jason Morgan <jwm-freebsd-questions@sentinelchicken.net>
To: freebsd-questions@freebsd.org
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Subject: Re: gmirror on different sized disks
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On Fri, Aug 18, 2006 at 03:47:57PM -0500, Doug Poland wrote:
> Hello,
> 
> Until just a few moments ago, I thought I had identical sized drives
> (arrays, really) on my i386 6.1-STABLE box.
> 
> I was trying to create a gmirror on ar1 from ar0 when gmirror reported
> to me:  Provider ar1 too small.
> 
> my dmesg reports:
> ar0: 152638MB <Promise Fasttrak RAID0 (stripe 128 KB)> status: READY
> ar1: 152637MB <Intel MatrixRAID RAID0 (stripe 128 KB)> status: READY
> 
> So it would seem I'm 1MB away from being able to create a "whole disk"
> mirror of ar0 on ar1.
> 
> Is my only recourse to mirror individual slices, as described in
> http://people.freebsd.org/~rse/mirror/ ??
> 
> Thanks for any help/pointers/suggestions.

Use your smaller disk as the first drive your insert into the mirror and 
I think you'll be ok.

-Jason