HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide (EK-G80TS-SA. C01, March 2005)

Glossary
292 HSG60 and HSG80 Array Controller and Array Controller Software Troubleshooting Guide
parity
A method of checking if binary numbers or characters are correct by counting the ONE bits.
In odd parity, the total number of ONE bits must be odd; in even parity, the total number of
ONE bits must be even. Parity information can be used to correct corrupted data. RAIDsets
use parity to improve the availability of data.
parity bit
A binary digit added to a group of bits that checks to see if errors exist in the transmission.
parity check
A method of detecting errors after data is sent over a communications line. With even
parity, the number of ONEs in a set of binary data should be even. With odd parity, the
number of ONEs should be odd.
parity RAID
See RAIDset.
participating mode
A mode within an L_port that allows the port to participate in loop activities. A port must
have a valid AL_PA to be in Participating mode.
partition
A logical division of a container, represented to the host as a logical unit.
PCM
Polycenter Console Manager.
PCMCIA
Personal Computer Memory Card Industry Association. An international association
formed to promote a common standard for PC card-based peripherals to be plugged into
computers. The card, commonly known as a PCMCIA card or program card, is about the
size of a credit card.
See also program card.
peripheral device
Any unit, distinct from the CPU and physical memory, that can provide the system with
input or accept any output from the unit. Terminals, printers, tape drives, and disks are
peripheral devices.
pluggable
A replacement method that allows the complete system to remain online during device
removal or insertion. The system bus must be halted, or quiesced, for a brief period of time
during the replacement procedure.
See also hot-pluggable.