From LQWiki

A volume group is a set of physical volumes within LVM having the same physical extent (block size). Volume groups can be augmented with extra physical volumes, even on a running system.

• vgs
• vgscan
• vgcreate
• vgextend
• vgreduce
• vgdisplay
• vgimport
• vgexport
• vgchange
• vgcfgbackup