HP 4000.6000.8000 Enterprise Virtual Arrays - Manual (Page 164)

baud The maximum rate of signal state changes per second on a communication circuit. If each signal
state change corresponds to a code bit, then the baud rate and the bit rate are the same. It is
also possible for signal state changes to correspond to more than one code bit so the baud rate
may be lower than the code bit rate.
bay The physical location of an element, such as a drive, I/O module, EMU or power supply in a
drive enclosure. Each bay is numbered to define its location.
bidirectional Also called Bi-Di. The movement of optical signals in opposite directions through a common fiber
cable such as the data flow path typically on a parallel printer port. A parallel port can provide
two-way data flow for disk drives, scanning devices, FAX operations and even parallel modems.
block Also called a sector. The smallest collection of consecutive bytes addressable on a disk drive. In
integrated storage elements, a block contains 512 bytes of data, error codes, flags, and the
block address header.
blower A variable speed airflow device that pulls air into an enclosure or element. It usually pulls air in
from the front and exhausts the heated air out the rear.
C
cabinet An alternate term used for a rack.
cable assembly A fiber optic cable that has connectors installed on one or both ends. General use of these cable
assemblies includes the interconnection of multimode fiber optic cable assemblies with either LC
or SC type connectors.
•
When there is a connector on only one end of the cable, the cable assembly is referred to
as a pigtail.
•
When there is a connector on each end of the cable, the cable assembly is referred to as
a jumper.
CAC Corrective Action Code. An HP P6000 Command View graphical user interface (GUI) display
component that defines the action required to correct a problem.
See also read cache,write cache, and mirrored cache.
cache High-speed memory that sets aside data as an intermediate data buffer between a host and the
storage media. The purpose of cache is to improve performance.
cache battery A rechargeable unit mounted within a controller enclosure that supplies back-up power to the
cache module in case of primary power shortage.
cache battery
indicator An orange light emitting diode (indicator) that illuminates on the controller operator control
panel (OCP) to define the status of the HSV Controller cache batteries. 1.
2. An amber status indicator that illuminates on a cache battery. When illuminated, it indicates
that one or more cache battery cells have failed and the battery must be replaced with a
new battery.
carrier A drive-enclosure-compatible assembly containing a disk drive or other storage devices.
client A software program that uses the services of another software program. The HP P6000 Command
View client is a standard internet browser.
communication
logical unit number
(LUN) See console LUN.
condition report A three-element code generated by the EMU in the form where e.t. is the element type (a
hexadecimal number), en. is the element number (a decimal number), and ec is the condition
code (a decimal number).
console LUN A SCSI-3 virtual object that makes a controller pair accessible by the host before any virtual disks
are created. Also called a communication LUN.
console LUN ID The ID that can be assigned when a host operating system requires a unique ID. The console
LUN ID is assigned by the user, usually when the storage system is initialized.
See also console LUN.
164 Glossary