Termos e Definições - O

Open Systems Adapter (OSA)
The Open Systems Adapter is actually a network controller that you can install in a mainframe I/O cage. The adapter integrates several hardware features and supports many networking transport protocols. The OSA card is the strategic communications device for the mainframe architecture. It has several key features that distinguish it from CCW-based communications.

Effectively, the OSA integrates the control unit and device into the same hardware. It does so by placing it on a single card that directly connects to the central processor complex I/O bus.

There are three main versions of the Open Systems Adapter:

The OSA-2
The OSA-Express
The OSA-Express2
The OSA-2 card is no longer available, but a significant number of installations still utilize them. The OSA-2 card is of interest here because it could only run using CCW-based operations. OSA-Express and OSA-Express2 cards utilized a much faster method of direct access called Queued Direct I/O (QDIO).

In addition, OSA-Express provides significant enhancements over the OSA-2 in function, connectivity, bandwidth, data throughput, network availability, reliability, and recovery. Meanwhile, the OSA-Express2 card represents the latest and most capable card in the OSA lineup.

Note that the maximum speed is a 10 Gbps data rate. In order to support such a large potential for data movement, as mentioned the OSA-Express and OSA-Express2 cards support a mode of operation called Queued Direct I/O, or QDIO. There are several different channel types supported by an OSA-Express2 card:
OSD. Queued Direct I/O (QDIO)
OSE. Non-Queued Direct I/O (non-QDIO)
OSC. OSA-Express Integrated Console Controller
OSN. Network Control Program (NCP) under Communication Contoller for Linux (CCL).
Only the OSA-Express2 card supports the OSC and OSN channel types. The following information uses the term "OSA-Express" to denote a function that both OSA-Express and OSA-Express2 can support.

OS/2 (Operating System/2)
An IBM operating system for personal computers that featured capabilities for large memory, multitasking and virtual machines.

OS/390 (Operating System/390)
IBM's premier mainframe operating system in the late 1990s. OS/390 superseded Multiple Virtual Storage (MVS), and was itself superseded by z/OS in 2000. See MVS and z/OS.

OS/400 (Operating System/400)
An IBM operating system for midrange computers.

OMEGAMON Subsystem procedure (What is/ Problems)
OMEGAMON products provides a comprehensive performance and availability solution to proactively analyze and manage operating systems, databases or other environments for optimal performance. It helps you detect bottlenecks and other potential performance problems from multiple vantage points, and quickly isolates and takes action automatically to resolve these issues. Below are few areas of MVS things that OMEGAMON can support :
CICS : Centrally monitors and manages CICS transactions and interactions with other applications/resources.
DB2 : A comprehensive tool to optimize efficiency of your DB2 database on z/OS. Monitors, analyzes and optimizes performance of DB2 database and applications on z/OS.
IMS : Provides a tool to optimize performance and availability of vital IMS systems.
NETWORK : Analyzes TCP/IP performance among CICS, DB2, IMS and other key systems
MQ SERIES : Manage and Configure WebSphere MQ, Message Broker, and InterChange Server. Provides performance management capabilities for WebSphere Application Server on z/OS
VM LINUX : Manage performance and availability of z/VM and Linux on System z.
MVS : Provides a performance and availability monitor for z/OS and OS/390 environments.
STORAGE : Provides a monitor for I/O sub-system performance and storage availability.
OMEGAMON can also support performance and problems from distributed sides.

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