In this article we will introduced LVM (Logical Volume Management), a versatile tool to manage and create lvm storage devices that provides scalability, when combined with RAID. We will use three disks of 8 GB each (/dev/sdb, /dev/sdc, and /dev/sdd) to create three physical volumes. You can either create the PVs directly on top of the device, or partition it first.
http://www.tecmint.com/manage-and-create-lvm-parition-using-vgcreate-lvcreate-and-lvextend/
