XRL/23, Cortex MS | IBM OS/390 guide

/XRL/23

	452	(1)	managing remote operations
		(2)	JES2 RJE operations
			452, 452, 453, 453, 453
D280018	2043CH28
	453	(1)	managing remote operations
		(2)	NJE operations
			454, 454
D310005	2043CH31
	476	(1)	DFSMS/MVS diagnosis
		(2)	DFSMSdfp
			476, 476, 477
D320003	2043CH32
	484	(1)	conversion process
		(2)	recommendations
			484, 484, 484, 484, 485, 485, 486
D320006	2043CH32
	487	(1)	mass conversion - background, benefits & method
		(2)	overview/benefits
			488, 488, 489, 489
D320009	2043CH32
	490	(1)	mass conversion - background, benefits & method
		(2)	CORTEX MS
			492, 492, 492, 492, 492, 492
D320010	2043CH32
	494	(1)	preparation phases
		(2)	Phase 0: project management & technical leadership
			494
D320012	2043CH32
	495	(1)	preparation phases
		(2)	Phase 1: application inventory
			496, 496, 496, 496
D320015	2043CH32
	499	(1)	preparation phases
		(2)	Phase 2: conversion specifications
			500, 501, 501
D320017	2043CH32
	501	(1)	preparation phases
		(2)	Phase 3: customization/development of conversion tools
			502, 502
D320018	2043CH32
	503	(1)	conversion phases
		(2)	program conversion
			503, 504
D320023	2043CH32
	506	(1)	conversion phases
		(2)	Phase 5: OS/390 regression tests & repeated trial
		conversions
			507, 507, 507, 507, 508, 508, 508, 508, 510
D320025	2043CH32
	511	(1)	conversion phases
		(2)	unit testing
			512, 512, 512, 512
D320026	2043CH32
	513	(1)	conversion phases
		(2)	system testing
			513, 513, 514
D320027	2043CH32
	514	(1)	conversion phases
		(2)	parallel/production simulation testing
			514, 515, 515
D320029	2043CH32
	516	(1)	implementation phases
		(2)	Phase 6: actual conversion & switchover
			516, 517
D320030	2043CH32
	517	(1)	implementation phases
		(2)	switchover
			517, 518
D330004	2043CH33
	520	(1)	conversion tools
		(2)	IBM OPTI-AUDIT for VSE
			521, 521
D330005	2043CH33
	522	(1)	conversion tools
		(2)	IBM COBOL and CICS CCCA
			523, 523
D330007	2043CH33
	525	(1)	conversion tools
		(2)	Computer Associates
			525, 525
D330008	2043CH33
	525	(1)	conversion tools
		(2)	The Source Recovery Company
			526, 526, 526, 526, 526, 526
D340001	2043CH34

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.

IBM OS/390 manual XRL/23, Cortex MS

Models: OS/390

/XRL/23

conversion process

CORTEX MS

OS/390 specifications