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Date: Fri, 12 Jan 2007 11:40:35 -0500
From: Caleb Hug <hug@mit.edu>
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Subject: [linux-lvm] Re: FC6: pvmove gives "device-mapper: reload ioctl
 failed: Invalid argument"
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To: linux-lvm@redhat.com

Hi,
I had exactly the same problem.  My guess is that it has something to do 
with the device-mapper not getting along with the x86_64 kernel. 

This is how I proceeded:
1) booted knoppix
2) loaded the dm-mod, and the dm-mirror modules:
    modprobe dm-mod
    modprobe dm-mirror
3) pvmove /dev/sddc1 ... and so on

seems to work fine,
~caleb