VERITAS Volume Manager 4.1 Migration Guide

Glossary
set of continuous physical extents [PEs]
Glossary84
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.