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

Glossary
HP NonStop S-Series Server Description Manual—520331-003
Glossary-111
TSM Service Application
TSM Service Application. See Compaq TSM Service Application.
two-lane link. The two single-mode fiber-optic (SMF) ServerNet cables that connect the HP
NonStop™ Cluster Switches on the same external fabric (for example, X1, X2, and X3)
in a tri-star topology.
UCME. See uncorrectable memory error (UCME).
UID. A nonnegative integer that uniquely identifies a user within a node.
In the Open System Services (OSS) environment, the UID is the scalar view of the HP
NonStop™ Kernel user ID. The UID is used in the OSS environment for functions
normally associated with a UNIX user ID.
unattended site. A computer environment where there is no operator residing on site and
the only access is from a central monitoring station.
uncorrectable memory error (UCME). An error caused by incorrect data at a particular
memory location. The cause of the error is such that the error is not automatically
corrected by the system, and memory replacement is required. Contrast with
correctable memory error (CME).
undefined. Pertaining to the use of an incorrect value for data or the incorrect behavior of a
program for which the ISO/IEC IS 9945-1:1990 standard imposes no portability
requirements.
undervoltage. A negative change in the amplitude of the voltage.
unicode. A 2-octet (2-byte) character code designed to represent more alphabetic and
graphic characters than allowed by the ASCII character set. When the first octet of a
unicode character is zero, the second octet maps to the ISO 8859-1 (ASCII) character
set. Unicode is the standard character set for encoding characters in implementations
of the Java language and is the default character code set used by several Microsoft
Windows operating systems.
uninterruptible power supply (UPS). The equipment used to provide an uninterruptible
source of power to connected equipment if a main power outage occurs. The basic
components of any UPS system are a rectifier/charger that converts alternating-current
(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.
unitary segment. See segment.
unmount. 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.