NonStop System Glossary

OCA region loading
A task performed when necessary by the TNS emulation software for TNS/E systems. This task
involves mapping into memory the Itanium instructions and any tables needed at run time from the
TNS Object Code Accelerator (OCA) region (called the Itanium instruction region) of an
OCA-generated object file.
OCA region of an object file
The region of a TNS Object Code Accelerator (OCA)-generated object file, also called the Itanium
instruction region, that contains Itanium instructions and tables necessary to execute the object file
on a TNS/E system in TNS accelerated mode. The TNS Object Code Accelerator (OCA) creates
this region. See also OCA-accelerated object code. Contrast with Accelerator region of an object
file.
OCI
See TNS Object Code Interpreter (OCI).
offline
1. Used to describe tasks that are performed outside of the control of an application or computer
system.
2. Used to describe tasks that require system resources to be shut down. Contrast with online.
offline change
Any change that requires system resources to be shut down. Offline changes are usually performed
during a planned outage. Contrast with online change.
offline configuration
Configuration performed offline by Distributed Systems Management/Software Configuration
Manager (DSM/SCM). If necessary, you edit the CONFTEXT configuration file to create a new
configuration and then run DSM/SCM to generate a system image for the new configuration.
ohm
The standard unit for measuring resistance. A one-ohm resistor will conduct one ampere when one
volt is applied.
online
Used to describe tasks that can be performed while the NonStop operating system and system
utilities are operational. Contrast with offline.
online change
Any change that can be performed while an application or its system resources are operational.
In some situations, online changes might temporarily affect subsystem and application availability.
For example, altering the characteristics of a communications line might temporarily affect
applications that use the communications line. Contrast with offline change.
Online Support Center (OSC)
The group of support specialists within the HP Global Mission Critical Solution Center (GMCSC)
who respond to telephone calls regarding system problems and diagnose malfunctioning systems
using remote diagnostic links.
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