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5.2.1. Overview
A side effect of LVM's power and flexibility is a greater degree of complication. Before diving into the LVM installation process, it is best to get familiar with some terms.
• Physical Volume (PV): physical hard disk, disk partition or software RAID partition formatted as LVM PV.
• Volume Group (VG): is made from one or more physical volumes. A VG can can be extended by adding more PVs. A VG is like a virtual disk drive, from which one or more logical volumes are carved.
• Logical Volume (LV): is similar to a partition in a non-LVM system. A LV is formatted with the desired file system (EXT3, XFS, JFS, etc), it is then available for mounting and data storage.