By this time, many Linux users may well know about the Logical Volume Management in Linux and the software RAID subsystem. The Logical Volume Manager (LVM) is a mechanism for virtualizing disks. It creates “Virtual disk drives and volumes(partitions)” out of one or more physical hard drives, allowing users to grow, shrink, move those VOLUMES from drive to drive as needed. In a Logical Volume Set, Logical Volumes are easy to resize without the need for repartitioning, backing up or losing the DATA whereas RAID provides a Fault Tolerant Mechanism for Disk crashes. Uses of LVM include extensively larger databases and file servers, but even home users may want large partitions for storing large amount of media files, etc.