HP-UX System Administrator's Guide: Overview

Table 3-1 Volume Manager Feature and Terminology Comparison (continued)
VERITAS Volume Manager (VxVM)HP Logical Volume Manager
(LVM)
Feature
a special area known as a “private
region” of each physical volume.
a special reserved area at the
beginning of each physical
volume.
Volume and Volume Group
configuration information is
stored in...
Mirrors consist of plexes, each of
which is a copy of the volume being
mirrored. The base version of the
VERITAS Volume Manager allows
you to mirror your root file system
(only).
Like LVM, VERITAS Volume
Manager requires an additional
license to support mirroring (beyond
the mirroring of your root file
system), but with the additional
license VxVM supports up to 32
copies of your data.
You need to add the
MirrorDisk/UX product to your
system to support mirroring.
Mirrordisk/UX supports up to
three copies of data if you are
using LVM with Version 1
volume groups, and up to six
copies of data if you are using
LVM with Version 2 volume
groups.
Mirrors (copies of data)
NOTE: VERITAS Volume Manager is available in several versions as of the Release
of HP-UX 11i version 3. Values and features shown are for VxVM Version 4.1. Consult
the VERITAS Volume Manager Release Notes of the appropriate version for that
version’s specifications.
The VERITAS Volume Manager has two licensing levels, base and full. Unless stated
otherwise, the features listed in the previous table are for the base level license. See the
VERITAS Volume Manager documentation for the additional features supported with
the full license level.
Volume Groups
When using a volume manager, the first step is to group physical drives into pools of
disk space called:
• disk groups, if you are using the VERITAS Volume Manager (VxVM)
or
• volume groups, if you are using the Logical Volume Manager (LVM)
NOTE: The individual disks in the disk/volume groups are called:
• VM disks, if you are using the VERITAS Volume Manager (VxVM).
or
• physical volumes, if you are using the Logical Volume Manager (LVM)
52 Major Components of HP-UX