NonStop S-Series Server Description Manual (G06.24+)

Glossary
HP NonStop S-Series Server Description Manual—520331-003
Glossary-57
logical device name
logical device name. The name assigned to an I/O process during its configuration. Other
processes use the logical device name when issuing Guardian procedure calls to the
I/O process.
logical device number. A number that identifies a particular I/O device in the system.
Logical device numbers are assigned to physical I/O devices.
logical disk volume. A hardware device or device pair that provides persistent, highly
accessible storage for data on a medium that is either magnetic or optical.
logical interface (LIF). A process that allows an application or another process to
communicate with data communications hardware.
logical memory unit (LMU). A group of four memory units. Memory on a processor and
memory board (PMB) is divided into two LMUs. One LMU contains memory units in
slots MS1 through MS4; the other LMU contains memory units in slots MS5 through
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. There are two types of
logical segments: 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).
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.
MAC address. See media access control (MAC) address.