VERITAS Volume Manager 3.1 Administrator's Guide

Introduction to Volume Manager
Volumes and Virtual Objects
Chapter 1 33
Figure 1-2 Example of a Subdisk
A VM disk can contain multiple subdisks, but subdisks cannot overlap or
share the same portions of a VM disk. See Figure 1-3, Example of Three
Subdisks Assigned to One VM Disk,
Figure 1-3 Example of Three Subdisks Assigned to One VM Disk
Any VM disk space that is not part of a subdisk is free space. You can use
free space to create new subdisks.
Volume Manager release 3.0 or higher supports the concept of layered
volumes in which subdisk objects can contain volumes. For more
information, see “Layered Volumes”.
Plexes
The Volume Manager uses subdisks to build virtual objects called
plexes. A plex consists of one or more subdisks located on one or more
physical disks. See Figure 1-4, Example Plex With Two Subdisks,.
Subdisk
VM Disk With One Subdisk
disk01
disk01-01
disk01-01
VM Disk
Physical Disk
Subdisks
devname
disk01
disk01-01
disk01-02
disk01-03