HP 3000 Enterprise Virtual Array - Manual (Page 206)

Glossary
206 Enterprise Virtual Array 3000 User Guide
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 between 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.
arbitrated loop physical address
See AL_PA.
arbitrated loop topology
See arbitrated loop.
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.
asynchronous
Events scheduled as the result of a signal requesting the event or that which is without any
specified time relation.
audible alarm
The environmental monitoring unit (EMU) alarm that sounds when there is a disk drive
enclosure element condition report. The audible alarm can be muted or disabled.