Glossary
This glossary defines the special terms,
abbreviations, and acronyms used in this
publication and other related publications. If you
do not find the term you are looking for, see the
IBM Glossary of Computing Terms located at the
following Web site:
www.ibm.com/ibm/terminology
The following cross-reference conventions are
used in this glossary:
See Refers you to (a) a term that is the
expanded form of an abbreviation or
acronym, or (b) a synonym or more
preferred term.
See also
Refers you to a related term.
Abstract Windowing Toolkit (AWT). A Java graphical
user interface (GUI).
accelerated graphics port (AGP). A bus specification
that gives low-cost 3D graphics cards faster access to
main memory on personal computers than the usual
peripheral component interconnect (PCI) bus. AGP
reduces the overall cost of creating high-end graphics
subsystems by using existing system memory.
access volume. A special logical drive that allows the
host-agent to communicate with the controllers in the
storage subsystem.
adapter. A printed circuit assembly that transmits user
data input/output (I/O) between the internal bus of the
host system and the external fibre-channel (FC) link and
vice versa. Also called an I/O adapter, host adapter, or
FC adapter.
advanced technology (AT) bus architecture. A bus
standard for IBM compatibles. It extends the XT bus
architecture to 16 bits and also allows for bus
mastering, although only the first 16 MB of main
memory are available for direct access.
agent. A server program that receives virtual
connections from the network manager (the client
program) in a Simple Network Management
Protocol-Transmission Control Protocol/Internet Protocol
(SNMP-TCP/IP) network-managing environment.
AGP. See accelerated graphics port.
AL_PA. See arbitrated loop physical address.
arbitrated loop. One of three existing fibre-channel
topologies, in which 2 - 126 ports are interconnected
serially in a single loop circuit. Access to the Fibre
Channel Arbitrated Loop (FC-AL) is controlled by an
arbitration scheme. The FC-AL topology supports all
classes of service and guarantees in-order delivery of
FC frames when the originator and responder are on
the same FC-AL. The default topology for the disk array
is arbitrated loop. An arbitrated loop is sometimes
referred to as a Stealth Mode.
arbitrated loop physical address (AL_PA). An 8-bit
value that is used to uniquely identify an individual port
within a loop. A loop can have one or more AL_PAs.
array. A collection of fibre-channel or SATA hard drives
that are logically grouped together. All the drives in the
array are assigned the same RAID level. An array is
sometimes referred to as a ″RAID set.″ See also
redundant array of independent disks (RAID), RAID
level.
asynchronous write mode. In remote mirroring, an
option that allows the primary controller to return a write
I/O request completion to the host server before data
has been successfully written by the secondary
controller. See also synchronous write mode, remote
mirroring, Global Copy,Global Mirroring.
AT. See advanced technology (AT) bus architecture.
ATA. See AT-attached.
AT-attached. Peripheral devices that are compatible
with the original IBM AT computer standard in which
signals on a 40-pin AT-attached (ATA) ribbon cable
followed the timings and constraints of the Industry
Standard Architecture (ISA) system bus on the IBM PC
AT computer. Equivalent to integrated drive electronics
(IDE).
auto-volume transfer/auto-disk transfer (AVT/ADT).
A function that provides automatic failover in case of
controller failure on a storage subsystem.
AVT/ADT. See auto-volume transfer/auto-disk transfer.
AWT. See Abstract Windowing Toolkit.
basic input/output system (BIOS). The personal
computer code that controls basic hardware operations,
such as interactions with diskette drives, hard disk
drives, and the keyboard.
BIOS. See basic input/output system.
BOOTP. See bootstrap protocol.
bootstrap protocol (BOOTP). In Transmission Control
Protocol/Internet Protocol (TCP/IP) networking, an
alternative protocol by which a diskless machine can
obtain its Internet Protocol (IP) address and such
© Copyright IBM Corp. 2009 247
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