VERITAS Volume Manager 3.1 Administrator's Guide

Introduction to Volume Manager

Virtual Object Data Organization (Volume Layouts)

Chapter 1 43

multi-user applications across multiple disks.

Figure 1-12, Example of a Striped Plex with One Subdisk per Column,

shows a striped plex with three equal-sized, single-subdisk columns.

There is one column per physical disk.

Figure 1-12 Example of a Striped Plex with One Subdisk per Column

The example in Figure 1-12, Example of a Striped Plex with One Subdisk

per Column, shows three subdisks that occupy all of the space on the VM

disks. It is also possible for each subdisk in a striped plex to occupy only

a portion of the VM disk, which leaves free space for other disk

management tasks.

Figure 1-13, Example of a Striped Plex with Concatenated Subdisks per

Column, shows a striped plex with three columns containing subdisks of

different sizes. Each column contains a different number of subdisks.

There is one column per physical disk. Striped plexes can be created by

using a single subdisk from each of the VM disks being striped across. It

is also possible to allocate space from different regions of the same disk

or from another disk (for example, if the plex is grown). Columns can

contain subdisks from different VM disks if necessary.

VM Disks

Physical Disks

column 1

column 2

column 3

Striped Plex

devname

disk01

disk01-01

disk03

disk03-01

disk02

disk02-01

SU = Stripe Unit

su1

su2

su3

su4

su5

su6

su4su1

su2 su5

su3 su6