HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and Configuration Guide

Glossary
–11HSG80 ACS Solution Software Version 8.7 for Compaq Tru64 UNIX Installation and
Configuration Guide
Glossary–11
initiator
A SCSI device that requests an I/O process to be performed by another
SCSI device, namely, the SCSI target. The controller is the initiator on
the device bus. The host is the initiator on the host bus.
instance code
A four-byte value displayed in most text error messages and issued by
the controller when a subsystem error occurs. The instance code
indicates when during software processing the error was detected.
interface
A set of protocols used between components, such as cables,
connectors, and signal levels.
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
(see SBB).
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.