HP StorageWorks 4400 User Manual

Glossary
This glossary defines terms used in this guide or related to this product and is not a comprehensive
glossary of computer terms.
µm A symbol for micrometer; one millionth of a meter. For example, 50 µm is
equivalent to 0.000050 m.
3U A unit of measurement representing three “U” spaces. “U” spacing is used to
designate panel or enclosure heights. Three “U” spaces is equivalent to 5.25
inches (133 mm).
See also rack-mounting unit.
active member of
a virtual disk
family
An active member of a virtual disk family is a simulated disk drive created by
the controllers as storage for one or more hosts. An active member of a virtual
disk family is accessible by one or more hosts for normal storage. An active
virtual disk member and its snapshot, if one exists, constitute a virtual disk family.
An active member of a virtual disk family is the only necessary member of a
virtual disk family.
See also virtual disk, virtual disk copy, virtual disk family, and snapshot.
adapter See controller.
allocation policy Storage system rules that govern how virtual disks are created. Allocate
Completely and Allocate on Demand are the two rules used in creating virtual
disks.
• Allocate Completely—The space a virtual disk requires on the physical disks
is reserved, even if the virtual disk is not currently using the space.
• Allocate on Demand—The space a virtual disk requires on the physical disks
is not reserved until needed.
ambient
temperature
The air temperature in the area where a system is installed. Also called intake
temperature or room temperature.
ANSI American National Standards Institute. A non-governmental organization that
develops standards (such as SCSI I/O interface standards and Fibre Channel
interface standards) used voluntarily by many manufacturers within the United
States.
arbitrated loop A Fibre Channel topology that links multiple ports (up to 126) together on a
single shared simplex media. Transmissions can only occur a single pair of nodes
at any given time. Arbitration is the scheme that determines which node has
control of the loop at any given moment
array All the physical disk drives in a storage system that are known to and under the
control of a controller pair.
array controller See controller.
HP StorageWorks 4400 Enterprise Virtual Array user guide 109

HP StorageWorks 4400 Specifications

General

Brand	HP
Model	StorageWorks 4400
Category	Storage
Language	English