VERITAS Volume Manager 3.1 Migration Guide

96
public region A region of a physical disk managed by VxVM that
contains available space and is used for allocating subdisks.
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.
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.