Logical Volume Manager concepts

Before you can start using Logical Volume Manager you must understand the basic mechanics and terminology.

Vary-on process
The vary-on process is one of the mechanisms that the LVM uses to ensure that a volume group is ready to use and contains the most up-to-date data.
Quorum
The quorum is one of the mechanisms that the LVM uses to ensure that a volume group is ready to use and contains the most up-to-date data.
Mirror Pools
Mirror pools make it possible to divide the physical volumes of a volume group into separate pools.
Geographic Logical Volume Manager
Geographic Logical Volume Manager (GLVM) allows you to maintain a mirror copy of your data at a geographically distant location.
Nonquorum volume groups
The Logical Volume Manager (LVM) automatically deactivates the volume group when it lacks a quorum of Volume Group Descriptor Areas (VGDAs) or Volume Group Status Areas (VGSAs). However, you can choose an option that allows the group to stay online as long as there is one VGDA/VGSA pair intact. This option produces a nonquorum volume group.
Conversion of a volume group to nonquorum status
You can change a volume group to nonquorum status to have data continuously available even when there is no quorum.

Parent topic: Logical Volume Manager