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IBM OS/390 manual 162

Models: OS/390

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Chapter 9. Telecommunications Subsystems
Chapter 8. Databases
Chapter 7. ICCF and TSO

6.1.11CICS UPSI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

6.1.12Application Programming . . . . . . . . . . . . . . . . . . . . . . . . 150

6.1.13 CICS/VSE and TS Coexistence Considerations . . . . . . . . . . . . 153

6.1.14Testing and Problem Determination Considerations . . . . . . . . . 153

6.1.15Vendor Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

6.2CICS with DL/I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

7.1Preparing to Use the System . . . . . . . . . . . . . . . . . . . . . . . . . . 155

7.1.1User Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

7.1.2LOGON Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

7.1.3Message Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

7.1.4Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

7.1.5Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

7.2Using the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

7.2.1Accessing the System . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

7.2.2Entering and Manipulating Data . . . . . . . . . . . . . . . . . . . . . 159

7.3Executing Programs at a Terminal . . . . . . . . . . . . . . . . . . . . . . 161

7.4

Submitting Jobs for Batch Execution

162

7.4.1 Using Command Procedures

163

7.5

Migrating from VSE/ICCF to MVS and TSO/E

163

7.5.1Converting ICCF Libraries . . . . . . . . . . . . . . . . . . . . . . . . . 163

7.5.2ICCF Procedures and Macros . . . . . . . . . . . . . . . . . . . . . . . 167

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

8.1DL/I and IMS/VS DB Differences . . . . . . . . . . . . . . . . . . . . . . . . 169

8.1.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

8.1.2MVS System Requirements . . . . . . . . . . . . . . . . . . . . . . . . 170

8.1.3Data Base Descriptor (DBD) . . . . . . . . . . . . . . . . . . . . . . . . 170

8.1.4 Program Specification Block (PSB)

. . . . . . . . . . . . . . . . . . . 171

8.1.5Batch Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

8.1.6Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

8.1.7Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

8.1.8Database Portability . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

8.1.9DL/I Multiple Partition Support . . . . . . . . . . . . . . . . . . . . . . 178

8.1.10Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

8.2 SQL/DS to DB2 for OS/390 Migration Consideration . . . . . . . . . . . . 178

8.2.1Descriptions of Users . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

8.2.2Other Comparison Areas . . . . . . . . . . . . . . . . . . . . . . . . . 181

8.2.3Summary of Migration Task . . . . . . . . . . . . . . . . . . . . . . . . 182

. . . . . . . . . . . . . . . . . . 185

9.1ACF/VTAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

9.1.1Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

9.1.2Resource Definition and Operation . . . . . . . . . . . . . . . . . . . . 187

9.1.3Customization and Programming . . . . . . . . . . . . . . . . . . . . . 190

9.1.4Network Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

9.2ACF/NCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

9.2.1Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

9.2.2Program Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

9.2.3Backlevel Hardware Support . . . . . . . . . . . . . . . . . . . . . . . 193

9.3BTAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

9.3.1Product Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

9.3.2Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

9.4Migrating TCP/IP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

viVSE to OS/390 Migration Workbook

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IBM OS/390 manual 162
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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.