VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Device Discovery
10 VERITAS Volume Manager Administrator’s Guide
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.
VxVM release 3.0 or higher supports the concept of layered volumes in which subdisks
can contain volumes. For more information, see “Layered Volumes” on page 30.
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. For example, see the plex vol01-01
shown in “Example of a Plex with Two Subdisks”
Example of a Plex with Two Subdisks
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 described in
“Volume Layouts in VxVM” on page 13.
VM DiskPhysical Disk Subdisks
devname
disk01
disk01-01
disk01-02
disk01-03
disk01-01
disk01-02
disk01-03
disk01
vol01-01
disk01-01
disk01-02
disk01-01
disk01-02
Plex
Subdisks