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Date: Mon, 8 Jun 2009 23:23:00 +0100
From: Alasdair G Kergon <agk@redhat.com>
Subject: Re: [linux-lvm] pvmove or lv mirror/unmirror
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To: LVM general discussion and development <linux-lvm@redhat.com>

pvmove should work OK, but with a large amount of data you might consider
dividing it into several smaller pvmove commands with the range syntax
  SourcePhysicalVolume[:PE[-PE]...
  /dev/xda:0-100000
to give you more checkpoints along the way.

Alasdair