Fast Ethernet Adapter Installation and Support Guide

Glossary
Fast Ethernet Adapter Installation and Support Guide—425685-003
Glossary-64
open file
open file. In the Open System Services (OSS) file system, a file with a file descriptor.
open file description. In the Open System Services (OSS) file system, a data structure
within an HP NonStop™ node that contains information about the access of a process
or of a group of processes to a file. An open file description records such attributes as
the file offset, file status, and file access modes. An open file description is associated
with only one open file but can be associated with one or more file descriptors.
open migration. In the Open System Services (OSS) file system, the set of events and
outcomes that occur when an open file description is inherited by a child process in a
different processor than its parent process. Contrast with open propagation.
open propagation. In the Open System Services (OSS) file system, the set of events and
outcomes that occur when an open file description is inherited by a child process in the
same processor as its parent process. Contrast with open migration.
Open SCSI. A subsystem that provides the hardware and software for a SCSI-2 open
interface that runs on HP NonStop™ S-series servers and to which developers can
attach small computer system interface (SCSI) devices.
open system. A system with interfaces that conform to international computing standards
and therefore appear the same regardless of the system’s manufacturer. For example,
the Open System Services (OSS) environment on HP NonStop™ systems conforms to
international standards such as ISO/IEC IS 9945-1:1990 (ANSI/IEEE Std. 1003.1-
1990, also known as POSIX.1), national standards such as FIPS 151-2, and portions
of industry specifications such as the X/Open Portability Guide Version 4 (XPG4).
Open System Services (OSS). An open system environment available for interactive or
programmatic use with the HP NonStop™ Kernel operating system. Processes that
run in the OSS environment usually use the OSS application program interface;
interactive users of the OSS environment usually use the OSS shell for their command
interpreter. Synonymous with “Open System Services (OSS) environment.” Contrast
with Guardian.
Open System Services (OSS) environment. The HP NonStop™ Kernel Open System
Services (OSS) application program interface (API), tools, and utilities.
Open System Services (OSS) Monitor. A Guardian utility that accepts commands affecting
OSS objects through an interactive Guardian interface named the Subsystem Control
Facility (SCF).
Open System Services (OSS) signal. A signal model defined in the POSIX.1 specification
and available to TNS processes and TNS/R native processes in the OSS environment.
OSS signals can be sent between processes.
Open Systems Interconnection (OSI). A seven-layer network architecture model defined
by the International Organization for Standardization (ISO). The two lowest layers deal
with the physical connections and their protocols. The five upper layers deal with
network services, such as network file transfers and accessing remote databases.