NonStop S-Series Hardware Installation and FastPath Guide (G06.25+)

Glossary
HP NonStop S-Series Hardware Installation and FastPath Guide—529443-001
Glossary-74
Open Systems Interconnection Layer 2
Open Systems Interconnection Layer 2. The data-link control level of the Open Systems
Interconnection (OSI) model, composed of asynchronous or minimal line control
protocols, byte-oriented or character-oriented protocols, and bit-synchronous or
bit-oriented protocols. Data link protocols can be defined in terms of method of access
of data, link relationship of stations, error detection scheme, error recovery, message
formatting, logical half-duplex or full-duplex operation, code, and machine
transparency.
operating system. See HP NonStop™ operating system.
operating system image. See OSIMAGE.
operational environment. The conditions under which your system performs. These
conditions include the devices and communications lines that are made active and the
system and application processes that are started at system startup.
operator. (1) A symbol, such as an arithmetic or conditional operator, that performs a
specific operation on operands. (2) In Network Control Language (NCL), a lexical
element used for working on terms in expressions. The five types of operators are
parenthetical, arithmetic, Boolean, relational, and string. (3) For an HP NonStop™
server, the person or program responsible for day-to-day monitoring and maintenance
tasks associated with the HP NonStop operating system and the hardware of a
NonStop node. The operator issues commands to subsystems; retrieves, examines,
and responds to event messages; or does any combination of those things. See also
local operator. Contrast with administrator. (4) For a UNIX system, any interactive user
of that system.
operator message. A message, intended for an operator, that describes a significant event
on an HP NonStop™ server. An operator message is the displayed-text form of an
Event Management Service (EMS) event message.
option. In a UNIX or Open System Services (OSS) command, a flag and its parameters or
a flag without parameters.
orphaned process group. In the Open System Services (OSS) environment, a process
group in which the parent of every member is also either a member of the process
group or a member of a different session.
orphan file. In the Open System Services (OSS) environment, a file with no corresponding
inode in the PXINODE file.
orphan inode. In the Open System Services (OSS) environment, an inode that appears in
the PXINODE file but has no links in the PXLINK file.
OS. See HP NonStop™ operating system.
OSC. See Online Support Center (OSC).