HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

Glossary
319HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Command Line Interface Reference Guide
DWZZB
An HP StorageWorks SCSI bus signal converter used to connect a variety of 16-bit
single-ended devices to hosts with 16-bit differential SCSI adapters. See also SCSI bus
signal converter.
DWZZC
The 16-bit SCSI table-top SCSI bus signal converter used to extend a differential SCSI bus,
or to connect a differential SCSI bus to a single-ended SCSI bus. See also SCSI bus signal
converter.
ECB
External Cache Battery. The unit that supplies backup power to the cache module in the
event the primary power source fails or is interrupted.
EIA
Electronic Industries Association. EIA is a standards organization specializing in the
electrical and functional characteristics of interface equipment.
EMU
Environmental Monitoring Unit. A unit that provides increased protection against
catastrophic failures. Some subsystem enclosures include an EMU which works with the
controller to detect conditions such as failed power supplies, failed blowers, elevated
temperatures, and external air sense faults. The EMU also controls certain cabinet hardware
including alarms and fan speeds.
environmental monitoring unit
See EMU
ESD
Electrostatic Discharge. The discharge of potentially harmful static electrical voltage as a
result of improper grounding.
extended subsystem
A subsystem in which one or two enclosures are connected to the primary enclosure.
external cache battery
See ECB
F_Port
A port in a fabric where an N_Port or NL_Port may attach.
fabric
A group of interconnections between ports that includes a fabric element.
failback
The process of restoring data access to the newly-restored controller in a dual-redundant
controller configuration. See also failover.