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B-2 Glossary of Terms and Abbreviations
Copyright © 2003 by LSI Logic Corporation. All rights reserved.
MPT architecture offers a single binary, operating system driver that supports
both Fibre Channel and SCSI devices now.
Host The computer system in which a storage adapter is installed. It uses the storage
adapter to transfer information to and from devices attached to the SCSI bus.
Host Adapter
Board (HAB) A circuit board or integrated circuit that provides a device connection to the
computer system.
Internal SCSI
Device A SCSI device installed inside the computer cabinet. These devices are
connected together using an unshielded ribbon cable.
Main Memory The part of a computer’s memory which is directly accessible by the CPU
(usually synonymous with RAM).
NVRAM Non-volatile Random Access Memory. Actually an EEPROM (Electronically
Erasable Read-Only Memory chip) used to store configuration information. See
EEPROM.
PCI and PCI-X Peripheral Component Interconnect (PCI) and Peripheral Component
Interconnect-extended. A high performance local bus specification that allows
connection of devices directly to computer memory. The PCI Local Bus allows
transparent upgrades from 32-bit data path at 33 MHz to 64-bit data path at 33
MHz, and from 32-bit data path at 66 MHz to 64-bit data path at 66 MHz. The
PCI-X Local Bus supports a 64-bit data path at 133 MHz.
Peripheral
Devices A piece of hardware (such as a video monitor, disk drive, printer, or
CD-ROM) used with a computer and under the computer’s control. SCSI
peripherals are controlled through a SCSI storage adapter (host adapter).
SCSI Bus A storage adapter (host adapter) and one or more SCSI peripherals connected
by cables in a linear configuration. The adapter may exist anywhere on the bus,
allowing connection of both internal and external SCSI devices. A system may
have more than one SCSI bus by using a multi-channel adapter or by using
multiple adapters.
SCSI Device Any device that conforms to the SCSI standard and is attached to the SCSI bus
by a SCSI cable. This includes SCSI storage adapters (host adapters) and SCSI
peripherals.
SCSI ID A way to uniquely identify each SCSI device on the SCSI bus. Each SCSI bus
has eight available SCSI IDs numbered 0 through 7 (or 0 through 15 for Wide
SCSI). The storage adapter (host adapter) usually gets the highest ID (7 or 15)
giving it priority to control the bus.