LVM

AN!Wiki :: LVM

LVM is an acronym for Logical Volume Management.

It is a tool that takes one or more real or virtual disks and assigns them as Physical Volumes (PVs). From one or more PVs you can create a Volume Group (VG). The VG acts as a pool of raw space from which one or more Logical Volumes (LVs) can be created. These LVs are essentially a tradition partition on top of which you can format with a filesystem, assign to a RAID device and so on.

PV

Physical Volume; This is a raw partition from a disk assigned to be used in an LVM.

VG

Volume Group; This is a pool of one or more PVs. From this pool of raw space, LVs are created.

LV

Logical Volume; This is similar to a traditional raw partition. You can format an LV with a filesystem, add it to a RAID or DRBD array and so on.

CLVM

When LVM is used in a cluster, it is referred to as Clustered LVM. This indicates that it has been made "cluster aware" and now relies on the cluster's DLM for safe operation. CLVM relies on the clvmd daemon to operate.

 

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