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