NonStop S-Series Hardware Installation and FastPath Guide (G06.26+)

Glossary
HP NonStop S-Series Hardware Installation and FastPath Guide—529876-001
Glossary-62
logical segment
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.
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). (1) A unique number used on a SCSI bus to differentiate
between devices on the bus. (2) 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™ 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 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
.
MAF. See missed address file (MAF).
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.
main service entrance. The enclosure containing connection panels and switchgear,
located at the point where the utility power lines enter the building.