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Logical Volume Manager (LVM) is a way to format your drives which allows you to easily resize partitions, take snapshots, and stripe partitions across multiple disks. Many operations can also be done online while the partition is mounted.
Background
Volume groups span one or more physical volumes.
Logical volumes are the final partitions which you put a filesystem on. Each logical volume lies on a single volume group.
Usage
Logical Volume
# Show
sudo lvs
# Create
lvcreate -l +100%FREE MyVolGroup -n homevol
# Resize
lvresize -l +100%FREE --resizefs MyVolGroup/mediavol
Resources
