Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

■ Accessing a volume
About volume creation
Volumes are logical devices that appear as physical disk partition devices to data
management systems. Volumes enhance recovery from hardware failure, data
availability, performance, and storage configuration.
You can also use the Veritas Intelligent Storage Provisioning (ISP) feature to create
and administer application volumes. These volumes are very similar to the
traditional VxVM volumes that are described in this chapter. However, there are
significant differences between the functionality of the two types of volume that
prevents them from being used interchangeably.
See the Veritas Storage Foundation Intelligent Storage Provisioning Administrator’s
Guide.
Volumes are created to take advantage of the VxVM concept of virtual disks. A
file system can be placed on the volume to organize the disk space with files and
directories. In addition, you can configure applications such as databases to
organize data on volumes.
Disks and disk groups must be initialized and defined to VxVM before volumes
can be created from them.
See “About disk management” on page 76.
See “About disk groups” on page 194.
Types of volume layouts
VxVM allows you to create volumes with the following layout types:
A volume whose subdisks are arranged both sequentially and
contiguously within a plex. Concatenation allows a volume to be
created from multiple regions of one or more disks if there is not
enough space for an entire volume on a single region of a disk. If
a single LUN or disk is split into multiple subdisks, and each
subdisk belongs to a unique volume, this is called carving.
See “Concatenation, spanning, and carving” on page 38.
Concatenated
Creating volumes
About volume creation
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