HP 3000 Enterprise Virtual Array - Manual (Page 225)

Glossary
225 Enterprise Virtual Array 3000 User Guide
port-wine colored
An HP convention of applying the color of port wine to a CRU tab, lever, or handle to identify
the unit as hot-pluggable.
power distribution module
See PDM.
power distribution unit
See PDU.
power supply
An element that develops DC voltages for operating the storage system elements from either
an AC or DC source.
preferred address
An AL_PA which a node port attempts to acquire during loop initialization.
preferred path
A preference for which controller of the controller pair manages the virtual disk. This
preference is set by the user through the element manager when creating the virtual disk. A
host can change the preferred path of a virtual disk at any time. The primary purpose of
preferring a path is load balancing.
protocol
The conventions or rules for the format and timing of messages sent and received.
pushbutton
A switch that is engaged or disengaged when it is pressed.
quiesce
The act of rendering bus activity inactive or dormant. For example, “quiesce the SCSI bus
operations during a device warm-swap.”
rack
A floor-standing structure primarily designed for, and capable of, holding and supporting
storage system equipment. All racks provide for the mounting of panels per Electronic
Industries Alliance (EIA) Standard RS-310-C.
rack-mounting unit
A measurement for rack heights based upon a repeating hole pattern. It is expressed as “U”
spacing or panel heights. Repeating hole pattern are spaced every 1.75 inches (44.45 mm) and
based on EIA’s Standard RS-310-C. For example, a 3U unit is 5.25-inches (133.35 mm) high,
and a 4U unit is 7.0-inches (177.79 mm) high.