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Date: Sun, 23 Feb 2014 19:12:48 -0800
From: Julie Ashworth <ashworth@berkeley.edu>
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Subject: Re: [linux-lvm] LV mirror extents on same physical device
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To: LVM general discussion and development <linux-lvm@redhat.com>

On 23-02-2014 21.03 -0600, Roger Heflin wrote:
> without the anywhere option it indicates you need *4* devices, 2 for
> data, and 2 for mirror log, using anywhere removes the more than 1
> device for everything,.

The -alloc=aywhere simply refers to the log. I'm not concerned about the log, I'm concered about the actual image extents, which seem to be both on /dev/md1.
 
> Using this format should allow you to force the move of a copy from
> one device to another, see the pvmove man page for more details.
> 
> pvmove /dev/sdb1:1000-1999 /dev/sdc1:0-999

The end goal is to convert the mirror to a linear volume (on /dev/md2). 
I'm still not convinced that pvmove is the right utility for mirrored extents. But thanks for the advice - I will try it if lvconvert -m0 fails. (this is a test server).

best,
Julie