6760 ServerNet/DA Manual

Glossary
6760 ServerNet/DA Manual—424879-003
Glossary-100
unmount
(ac) power to direct-current (dc) power, batteries that store the dc power, and an
inverter that converts the dc power back into ac power for distribution to the load.
unmount. In the Network File System (NFS), to make a fileset inaccessible to the users of a
node.
unplanned outage. Time during which a computer system is not capable of doing useful
work because of an unplanned interruption. Unplanned interruptions can include
failures caused by faulty hardware, operator error, or disaster.
unshielded twisted pair (UTP). A transmission medium consisting of two twisted
conductors with no cable shielding. Contrast with shielded twisted pair (STP)
.
unspecified. Pertaining to the use of a correct value for data or the correct behavior of a
program for which the ISO/IEC IS 9945-1:1990 standard imposes no portability
requirements.
UPS. See uninterruptible power supply (UPS).
upward compatibility. The ability of a requester to operate with a server of a later revision
level. In this case, the requester is upward-compatible with the server and the server is
downward-compatible with the requester. Contrast with downward compatibility
.
user code. A logically distinct part of the HP NonStop™ Kernel operating system that
consists of the code for user processes.
user database. A database within an HP NonStop™ node that contains the user name,
user ID, group ID, initial working directory, and initial user program for each user of the
node.
user ID. The unique identification of a user within a node.
In the Guardian environment, the term “user ID” usually means the structured view of
the HP NonStop™ Kernel user ID
. In the Open System Services (OSS) environment,
the term “user ID” usually means the scalar view of the HP NonStop™ Kernel user
ID—a number called the UID
.
user library. A logically distinct part of the HP NonStop™ Kernel operating system that
consists of procedures that the operating system can link to a program file at run time.
user name. A string that uniquely identifies a user within the user database for a node.
UTC. See Coordinated Universal Time (UTC).
UTP. See unshielded twisted pair (UTP).
V. See volt (V).
V.35. The International Telecommunications Union, Telecommunication Standardization
Sector (ITU-T) standard for data transmission at 48 kilobits/second over 60 - 108