Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Compaq Tru64 UNIX Installation and Configuration Guide

Glossary–9
I/O Refers to input and output functions.
I/O driver The set of code in the kernel that handles the physical I/O to a device. This is
implemented as a fork process. Same as driver.
I/O interface See interface.
I/O module A 16-bit SBB shelf device that integrates the SBB shelf with either an 8-bit
single ended, 16-bit single-ended, or 16-bit differential SCSI bus.
I/O operation The process of requesting a transfer of data from a peripheral device to
memory (or visa versa), the actual transfer of the data, and the processing and
overlaying activity to make both of those happen.
IPI Intelligent Peripheral Interface. An ANSI standard for controlling peripheral
devices by a host computer.
IPI-3 Disk Intelligent Peripheral Interface Level 3 for Disk
IPI-3 Tape Intelligent Peripheral Interface Level 3 for Tape
JBOD Just a bunch of disks. A term used to describe a group of single-device logical
units.
kernel The most privileged processor access mode.
LBN Logical Block Number.
L_port A node or fabric port capable of performing arbitrated loop functions and
protocols. NL_Ports and FL_Ports are loop-capable ports.
LED Light Emitting Diode.
link A connection between two Fibre Channel ports consisting of a transmit fibre
and a receive fibre.
local connection A connection to the subsystem using either its serial maintenance port or the
host SCSI bus. A local connection enables you to connect to one subsystem
controller within the physical range of the serial or host SCSI cable.
local terminal A terminal plugged into the EIA-423 maintenance port located on the front
bezel of the controller. See also maintenance terminal.
logical bus A single-ended bus connected to a differential bus by a SCSI bus signal
converter.