Veritas Storage Foundation Intelligent Storage Provisioning 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

34 Understanding ISP
About ISP concepts
These concepts are defined in the following sections (in order of increasing
abstraction):
■ About disk groups
■ About LUNs
■ About attributes
■ About storage pools
■ About storage pool sets
■ About storage pool policies
■ About capabilities
■ About rules
■ About volume templates
■ About template sets
■ About user templates
■ About application volumes
■ About volume intent
About disk groups
A disk group is a named collection of disks that share a common configuration.
Volumes and other VxVM objects must be created within a disk group, and are
restricted to using disks from within that disk group.
About LUNs
A LUN, or logical unit, can either correspond to a single physical disk, or to a
collection of disks that are exported as a single logical entity, or virtual disk, by a
device driver or by an intelligent disk array’s hardware. VxVM and other Veritas
software modules may be capable of automatically discovering the special
characteristics of LUNs, or you can use disk tags to define new storage
attributes. Disk tags are administered by using the
vxdisk command or the VEA
graphical user interface.