This section explains how you would back up and recover volumes managed by Linux Logical Volume Manager (LVM), called logical volumes; and multiple-disk (MD) devices, called Linux Software RAID.
To learn more about LVM please visit http://tldp.org/HOWTO/LVM-HOWTO/ or http://www.centos.org/docs/5/html/5.1/Deployment_Guide/ch-lvm.html.