Two Words About LVM

• Logical Volume Manager (LVM) is a tool to decouple file-systems (and raw devices) from the physical disks.
• with LVM, we create a volume group (vg), from one or more disks.
• On top of a vg, we can create logical volumes (lv).
• File-systems get created on top of the logical volumes.
• To add new capacity, we simply add a new device to the vg, and then either create new logical volumes, or expand existing ones.
• Since the volumes are now not tied to physical devices, we can add features such as snapshots, mirroring, etc.

Originally written by guy keren