C.1. How LVM is implemented

The Linux LVM plug-in is compatible with volumes and volume groups from the original Linux LVM tools from Sistina Software. The original LVM is based on the concept of volume groups. A volume group (VG) is a grouping of physical volumes (PVs), which are usually disks or disk partitions. The volume group is not directly usable as storage space; instead, it represents a pool of available storage. You create logical volumes (LVs) to use this storage. The storage space of the LV can map to one or more of the group's PVs.

The Linux LVM concepts are represented by similar concepts in the EVMS LVM plug-in. A volume group is called a container, and the logical volumes that are produced are called regions. The physical volumes can be disks, segments, or other regions. Just as in the original LVM, regions can map to the consumed objects in a variety of ways.