NonStop S-Series Planning and Configuration Guide (G06.25+)

Glossary
HP NonStop S-Series Planning and Configuration Guide—523303-015
Glossary-115
UPS
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 (UC). See TNS code space.
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 (UL). See TNS code space.
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
kilohertz group band circuits. It contains the 34-pin V.34 connector specifications
normally implemented on a modular RJ-45 connector. V.35 is the equivalent of
Electronics Industry Association (EIA) RS-422/RS-449.
V AC. Volts of alternating current.
vertical tetrahedron. A topology of HP NonStop™ S-series servers in which the ServerNet
connections between the layers of a cluster switch group
form a tetrahedron. See also
tetrahedron
, tetrahedral topology, and cluster switch layer.
virtual file system. In UNIX and Open System Services (OSS), a file system that allows
files of a fileset to be distributed across several physical devices.