Move data/system from one drive to another on a live running system using
LVM tools.

0. Connect new drive.
1. Make it a Physical volume:  (pvcreate).
2. Extend current VolGroup to include new PV: (vgextend).
3. Move blocks from old drive to new:	(pvmove).
4. Remove old drive from VolGroup:	(vgreduce).

Credits to Phil Edwards (phil_at_linux2000_dot_com).