Description of problem:
pvmove fails with device-mapper error.
The system with the problem was installed from scratch with
a root LVM filesystem. After installation, an old LVM1 volume
group (localvg1) was converted to LVM2 and imported into new
volume group (localvg2). All volumes function properly other
than the pvmove failing. The old volume group was created
under RHEL v3WS.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Run pvmove
[root@rutabaga ~]# pvmove -v -n /dev/localvg2/home /dev/sda1 /dev/hda2
Finding volume group "localvg2"
Archiving volume group "localvg2" metadata.
Creating logical volume pvmove0
mirror: Required device-mapper target(s) not detected in your kernel
The move should succeed.
You'll need to load the dm-mirror module into your kernel.
Newest 'mkinitrd' see this done automatically at boot time.
(See also bz #122991.)