From mboxrd@z Thu Jan  1 00:00:00 1970
From: Goswin von Brederlow <goswin-v-b@web.de>
Subject: Re: Migrating RAID 1 volumes to Dual ported disks.
Date: Thu, 05 Nov 2009 03:02:05 +0100
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	(Simon Jackson's message of "Wed, 4 Nov 2009 15:24:43 +0000")
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To: Simon Jackson <sjackson@bluearc.com>
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Simon Jackson <sjackson@bluearc.com> writes:

> Sorry, I am probably being thick here, but do you mean something like:
>
> mdadm --create /dev/md10 --level=multipath --raid-devices=2 /dev/sdc /dev/sdd
>
> When I tried this I got:
>
> # mdadm --create /dev/md10 --level=multipath --raid-devices=2 /dev/sdc /dev/sdd
> mdadm: /dev/sdc is too small: 0K
> mdadm: create aborted
> #

If sdc is 0k big then it doesn't look like that is your full disk.

MfG
        Goswin