Open Systems Architecture
OSI. A model that represents a network as a hierarchical structure of functional layers. Each
layer provides a set of functions that can be accessed and used by the layer above. Layers are
independent, in that implementation of a layer can be changed without affecting other layers
open systems management server
OSMS. An optional feature that can be enabled on the Director or Edge Switch through the
Product Manager application. When enabled, host control and management of the Director or
Edge Switch are provided through an Open System Interconnection (OSI) device attached to a
Director or Edge Switch port.
open systems mode
The mode that is used for Hewlett-Packard or open fabrics. See also
In Director or Edge Switch, in managed products, a selection between s/390 and open systems
mode. See also
OS. Software that controls execution of applications and provides services such as resource
allocation, scheduling, I/O control, and data management. Most operating systems are
predominantly software, but partial hardware implementations are possible (D, T).
OS/390™. An integrated, open-enterprise server operating system developed by IBM that
incorporates a leading-edge and open communications server, distributed data and file
services, parallel Sysplex™ support, object-oriented programming, distributed computing
environment, and open application interfaces (D).
Single fiber, multiple fibers, or a fiber bundle in a structure built to meet optical, mechanical,
and environmental specifications (D, E). See also
cable. Synonymous with
optical drive backup
A data backup system that uses rewriteable optical cartridges (ROCs) as the storage medium.
optical fiber connector
Synonymous with connector.
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