VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Understanding VERITAS Volume Manager
Device Discovery
Chapter 116
Combining Virtual Objects in VxVM
VxVM virtual objects are combined to build volumes. The virtual objects
contained in volumes are VM disks, disk groups, subdisks, and plexes.
Volume Manager objects are organized as follows:
• VM disks are grouped into disk groups
• Subdisks (each representing a specific region of a disk) are combined
to form plexes
• Volumes are composed of one or more plexes
The figure, “Connection Between Objects in VxVM,”, shows the
connections between Volume Manager virtual objects and how they
relate to physical disks. The disk group consists of two VM disks: disk01
has a volume with one plex and two subdisks, and disk02 has a volume
with one plex and a single subdisk
Figure 1-11 Connection Between Objects in VxVM
VM Disk
Physical Disk
disk01
vol01-01
disk01-01
disk01-02
vol01
disk01-01
disk01-02
Disk Group
VM Disk
disk02
vol02-01
disk02-01
vol02
disk02-01
Physical Disk
Volume
Volume
Plex
Plex
Subdisk
Subdisks
devname1
devname2