Manuals / IBM / Computer Equipment / Server

IBM OS/390 manual XRL/11, Dittind

Models: OS/390

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/XRL/11

 

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CICS

 

 

 

133, 133, 134, 135, 135, 136, 136, 136, 137, 137, 138,

 

 

 

138, 140, 140, 142, 143, 145, 147, 147, 149, 150, 151,

 

 

 

152, 153, 153, 153, 154, 154, 201, 201, 201, 252, 252,

 

 

 

252, 346, 366, 366, 367, 522, 522

C120001

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COBOL

 

 

 

131, 131, 131, 242, 249, 249, 249, 250, 250, 250, 250,

 

 

 

251, 252, 252, 252, 252, 253, 253, 253, 255, 255, 255,

 

 

 

256, 256, 257, 257, 257, 258, 258, 258, 259, 259, 259,

 

 

 

259, 259, 260, 260, 261, 263, 263, 265, 265, 265, 331,

 

 

 

331, 351, 354, 354, 355, 356, 366, 366, 492, 522, 526

A030004

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common applications - naming conventions

 

 

 

549, 550, 550, 551

C120008

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compiler options

C300007

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configuration management

 

 

 

469, 469, 470

C120007

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conversion considerations for all VSE COBOL compilers

C330001

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conversion services

 

 

 

519, 519

C330002

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conversion tools

 

 

 

43, 52, 486, 490, 520, 520, 522, 524, 525, 525

C340001

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customer migration example

 

 

 

529, 529, 531

C010001

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customer migration rationale

 

 

 

4, 4, 5, 5, 9

A030002

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data set name components

 

 

 

544, 546, 546, 547, 547

A030003

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data set name exclusions

 

 

 

547, 548, 548, 548, 548, 549, 549

C310009

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DFSMS/MVS diagnosis

 

 

 

476, 477, 478, 478

DITTIND

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DITTO

 

 

 

381, 381, 382, 383, 384, 384, 384, 385, 385, 385

C080001

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DL/I & IMS/VS DB differences

 

 

 

169, 170, 170, 171, 171, 173, 173, 175, 178

C120004

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DOS/VS COBOL & COBOL for OS/390 and VM language

 

 

differences

 

 

 

253, 255, 256, 256, 257

C150007

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DUMP in PL/I Optimizer

 

 

 

343, 343, 344, 344

C150004

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ENVIRONMENT attributes

 

 

 

339, 340, 340, 340

C010003

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functional reasons for migrating to OS/390

 

 

 

10, 10, 11, 11, 12

C250002

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hardware install and configure

 

 

 

402, 402, 402, 403, 404

C100002

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implementing JES2

 

 

 

209, 210, 211

C110002

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installing & configuring PSF/MVS

 

 

 

236, 236, 237, 237, 238

C110001

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introducing PSF/MVS

 

 

 

235, 235

C310003

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IPCS

 

 

 

473, 474, 474, 474

A020001

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ISV system management products

 

 

 

539, 539

C040003

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JCL differences (VSE and MVS)

 

 

 

73, 76, 76, 78, 78, 80, 81, 81, 81, 82, 84, 86, 88

C040002

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JCL high level similarities

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IBM OS/390 manual XRL/11, Dittind
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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.