Avago Technologies MegaRAID SAS 8204ELP - Manual (Page 80)

A-2 Glossary of Terms and Abbreviations
Copyright © 2005-2007 by LSI Logic Corporation. All rights reserved.
architectures. Fusion-MPT architecture offers a single binary, operating
system driver that supports both Fibre Channel and SCSI devices.
host The computer system in which a RAID controller is installed. The host
uses the RAID controller to transfer information to and from devices
attached to the SCSI bus.
host adapter
board A circuit board or integrated circuit that provides a device connection to
the computer system.
hot spare An idle, powered on, standby drive ready for immediate use in case of
disk failure. It does not contain any user data. A hot spare can be
dedicated to a single redundant array or it can be part of the global
hot-spare pool for all arrays managed by the controller.
When a disk fails, the controller firmware automatically replaces and
rebuilds the data from the failed drive to the hot spare. Data can be
rebuilt only from virtual disks with redundancy (RAID levels 1, 5, 10, and
50; not RAID level 0), and the hot spare must have sufficient capacity.
Internal SAS
device A SAS device installed inside the computer cabinet. These devices are
connected by using a shielded cable.
main memory The part of computer memory that is directly accessible by the CPU
(usually synonymous with RAM).
NVRAM Acronym for nonvolatile random access memory. An EEPROM
(Electronically Erasable Read-Only Memory chip) that stores
configuration information. Refer to EEPROM.
PCI Acronym for peripheral component interconnect. A high-performance,
local bus specification that allows the 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.
PCI Express Acronym for peripheral component interconnect Express. A
high-performance, local bus specification that allows the connection of
devices directly to computer memory. PCI Express is a two-way, serial
connection that transfers data on two pairs of point-to-point data lines.
PCI Express goes beyond the PCI specification in that it is intended as
a unifying I/O architecture for various systems: desktops, workstations,
mobile, server, communications, and embedded devices.