Veritas Volume Manager 5.0.1 Migration Guide, HP-UX 11i v3, First Edition, November 2009

private region A region of a physical disk used to store private, structured VxVM information.
The private region contains a disk header, a table of contents, and a configuration
database. The table of contents maps the contents of the disk.
physical extent A set of physical disk blocks on a physical volume that forms a basic unit of access
in LVM. This also forms the allocation unit for logical volumes.
snapshot A temporary extra copy (plex/mirror) created in a volume. A separate volume is
created once its contents are brought in sync with the original volume.
set of continuous
physical extents [PEs]
Set of physical sectors (blocks) contained within a single physical volume. A
physical extent is a specific, contiguous region of the disk where data resides.
This is of a constant size usually of 4 MB and has no partitions.
VGRA The Volume Group Reserved Area (VGRA) is a region on an LVM disk that holds
LVM configuration information and is at a fixed location. The location of this
fixed location depends upon whether the disk is a boot disk or a non-boot disk.
For boot disks, the VGRA starts at sector 2144. For non-boot disks, the VGRA
starts at sector 128.
volume group The collective identity of a set of physical volumes, which provide disk storage
for the logical volumes. A set of physical volumes whose space can be combined
and logically divided up into logical volumes. Only logical volumes and physical
volumes that are a part of a volume group can map together, a physical volume
can belong to only one volume group.
Glossary84