Volume Group Descriptor Area (VGDA)
The Volume Group Descriptor Area (VGDA) is an area of disk, at least one per PV,containing information for the entire VG. It contains administrative information about the volume group (for example, a list of all logical volume entries, a list of all the physical volume entries and so forth). There is usually one VGDA per physical volume. The exceptions are when there is a volume group with either one or two disks (as shown in the visual).