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

Figure 1-8
Example of three subdisks assigned to one VM Disk
Subdisks
VM disk with three subdisks
disk01
disk01-01
disk01-02
disk01-03
disk01-02 disk01-03disk01-01
Any VM disk space that is not part of a subdisk is free space. You can use free
space to create new subdisks.
Plexes
VxVM uses subdisks to build virtual objects called plexes. A plex consists of one
or more subdisks located on one or more physical disks.
Figure 1-9 shows an example of a plex with two subdisks.
Figure 1-9
Example of a plex with two subdisks
Plex with two subdisks
Subdisks
vol01-01
disk01-01 disk01-02
disk01-01 disk01-02
You can organize data on subdisks to form a plex by using the following methods:
■ concatenation
■ striping (RAID-0)
■ mirroring (RAID-1)
■ striping with parity (RAID-5)
Concatenation, striping (RAID-0), mirroring (RAID-1) and RAID-5 are types of
volume layout.
See “Volume layouts in VxVM” on page 34.
Understanding Veritas Volume Manager
How VxVM handles storage management
32