30Understanding Veritas Volume Manager

How VxVM handles storage management

Figure 1-8

Example of three subdisks assigned to one VM Disk

disk01-01

disk01-02

disk01-03

Subdisks

disk01-01

disk01-02

disk01-03

disk01

VM disk with three subdisks

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 51.

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 vol01-01shown in Figure 1-9.

Figure 1-9

Example of a plex with two subdisks

disk01-01 disk01-02

vol01-01

Plex with two subdisks

disk01-01

disk01-02

Subdisks

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HP Veritas Volume Manager 5.0 -UX 11i v3 manual Plexes