NonStop S-Series System Expansion and Reduction Guide

Table Of Contents
Glossary
G-Series Common Glossary
Glossary-59
logical segment
MS8. An LMU must have memory units installed either in all of its slots or in none of its
slots. See also memory unit
.
logical segment. A single data area consisting of one or more consecutive 128-kilobyte
unitary segments that is dynamically allocated by a process. The two types of logical
segments are selectable segments and flat segments. See also selectable segment
and flat segment
.
logic board (LB). (1) See cluster switch logic board. (2) A printed wiring assembly (PWA)
on which computer circuits (chips and wiring) are mounted. One type of logic board is a
processor and memory board (PMB). Another type is a multifunction I/O board
(MFIOB).
logical network partitioning. An HP NonStop™ TCP/IPv6 feature that allows you to divide
the system into separately addressed IP subnetworks whereby applications have
access only to a defined set of network interfaces (IP addresses).
logical unit number (LUN). The logical unit in the Enterprise Storage System (ESS) that
maps the LDEV onto a port
. Specification of the port and LUN specifies an LDEV.
login. The activity by which a user establishes a locally authenticated identity on a server.
Each login has one login name.
login name. A user name associated with a session.
logon sequence. The process through which the HP NonStop™ S-series server to be
managed is determined, the security constraints to interact with that server are met,
and a connection with that server is established.
low-level link. A connection between the OSM or TSM client software running on a system
console and the master service processors (MSPs) on an HP NonStop™ S-series
server. When the HP NonStop Kernel operating system is not running, communication
must take place over a low-level link. You can also communicate with a NonStop
S-series server over a low-level link when the operating system is running. See also
service connection
.
low PIN. A process identification number (PIN) that is in the range 0 through 254. Contrast
with high PIN
.
LUN. See logical unit number (LUN).
MAC address. See media access control (MAC) address.
main bonding jumper. The connection between the grounded circuit conductor and the
equipment grounding conductor at the service.
main memory. Data storage, specifically the chips that store the programs and data
currently in use by a processor. On HP NonStop™ S-series servers, main memory is
stored on the processor and memory board (PMB) in the processor multifunction