VERITAS Volume Manager 3.1 Administrator's Guide

Introduction to Volume Manager
Volumes and Virtual Objects
Chapter 1 35
select meaningful names for their volumes.
A volume can consist of up to 32 plexes, each of which contains one or
more subdisks. A volume must have at least one associated plex that has
a complete set of the data in the volume with at least one associated
subdisk. Note that all subdisks within a volume must belong to the same
disk group. See Figure 1-5, Example of a Volume with One Plex,.
Figure 1-5 Example of a Volume with One Plex
Volume vol01 in Figure 1-5, Exampleof a Volume with One Plex, has the
following characteristics:
• it contains one plex named vol01-01
• the plex contains one subdisk named disk01-01
• the subdisk disk01-01 is allocated from VM disk disk01
A volume with two or more data plexes is “mirrored” and contains mirror
images of the data. See Figure 1-6, Example of a Volume with Two
Plexes,
Figure 1-6 Example of a Volume with Two Plexes
Each plex contains an identical copy of the volume data. For more
information, see “Mirroring (RAID-1)”.
Volume vol06 in Figure 1-6, Example of a Volume with Two Plexes, has
the following characteristics:
Subdisk
Plex
disk01-01
vol01-01
vol01
Volume
vol06
disk02-01
vol06-02
disk01-01
vol06-01
Volume