Expand Configuration and Management Manual (G06.24+)

Glossary
Expand Configuration and Management Manual—523347-008
Glossary-10
Layer 4 send window
Layer 4 send window. A data structure that determines how many Expand packets are
sent before an acknowledgment is required on a single end-to-end (Layer 4)
connection.
LBU. The logical interface to a ServerNet/FX adapter. There are two LBUs: $ZZFOX.#X and
$ZZFOX.#Y. LBUs are created using the ServerNet/FX adapter subsystem SCF ADD
LBU command. (On non-NonStop S-series servers, LBU is an abbreviation for local
bus unit.)
line. A single physical connection between two systems. See also route and path.
line buffer. A portion of the Expand line-handler process data space used to buffer
incoming and outgoing messages after they have been formatted into packets by the
Expand line-handler process.
line function. One of the two functions of an Expand line-handler process. A single-line
Expand line-handler process performs both line and path functions with a single logical
device. A multi-line path requires a logical device to manage the path function and a
separate logical device for each line in the path.
line handler. See Expand line-handler process.
line logical device. A logical device that manages a line in a multi-line path. One line
logical device is required for each line in a multi-line path.
LNP. See logical network partitioning.
load. (1) To transfer the operating system image or an application from a disk into a
computer’s memory so that the operating system or application can run. (2) To insert a
tape into a tape drive, which prepares it for a tape operation (read or write).
load balancing. A term used to refer to the balancing of traffic on multi-CPU paths. $NCP
periodically runs a rebalancing algorithm that reconsiders the pairings of Expand line-
handler processes on each multi-CPU path. If the load is unbalanced, $NCP changes
some Expand line-handler process pairs. You can initiate an immediate rebalance
using the SCF RESET PROCESS command or specify when rebalancing should occur
using the SCF ALTER PROCESS command. See also rebalancing algorithm and
Expand line-handler process pair.
load factor. The ratio between a path’s effective time factor (ETF) and its base time factor
(TF). See also effective time factor (ETF).
local system. A term used to refer to the system to which your terminal is directly
connected.
logical device name. The name assigned to an input-output process (IOP) during its
configuration.