Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Figure 1-5
Connection between objects in VxVM
vol01
vol01-01 vol02-01 vol02-02
vol02
Disk group
Volumes
vol01-01 vol02-01 vol02-02
disk01 disk02 disk03
Plexes
Subdisks
VM disks
Physical
disks
disk01-01 disk02-01 disk03-01
disk01-01 disk02-01 disk03-01
devname1 devname2 devname3
disk01-01 disk02-01 disk03-01
The disk group contains three VM disks which are used to create two volumes.
Volume vol01 is simple and has a single plex. Volume vol02 is a mirrored volume
with two plexes.
The various types of virtual objects (disk groups, VM disks, subdisks, plexes and
volumes) are described in the following sections. Other types of objects exist in
Veritas Volume Manager, such as data change objects (DCOs), and volume sets,
to provide extended functionality.
Disk groups
A disk group is a collection of disks that share a common configuration, and which
are managed by VxVM. A disk group configuration is a set of records with detailed
information about related VxVM objects, their attributes, and their connections.
A disk group name can be up to 31 characters long.
29Understanding Veritas Volume Manager
How VxVM handles storage management