3.1.2 Matrix Server Administration Guide

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Configure Dynamic Volumes
Matrix Server includes a Volume Manager that you can use to create,
extend, recreate, or destroy dynamic volumes. Dynamic volumes allow
large filesystems to span multiple disks, LUNs, or storage arrays.
Overview
Basic and Dynamic Volumes
Volumes are used to store PSFS filesystems. There are two types of
volumes: dynamic and basic.
Dynamic volumes are created by the Volume Manager. They can include
one or more disks, disk partitions, or LUNs that have been imported into
the matrix. These entities are called subdevices. A single PSFS filesystem
can be placed on each dynamic volume. Additional subdevices can be
added to a dynamic volume as necessary, and the filesystem on the
volume can also be extended.
A basic volume consists of a single disk, disk partition, or LUN that has
been imported into the matrix. A PSFS filesystem is then created directly
on the disk, partition, or LUN. Basic volumes can be converted to
dynamic volumes.