25.2.1Processor Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 402

25.2.2Devices Supported by OS/390 . . . . . . . . . . . . . . . . . . . . . . 402

25.2.3DASD Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402

25.2.4Other Hardware Requirements . . . . . . . . . . . . . . . . . . . . . 403

25.2.5Inter-Systems Connectivity . . . . . . . . . . . . . . . . . . . . . . . . 404

25.3

Order and Install the OS/390 Software

405

25.3.1

Fee-based Methods of Installing OS/390

405

25.3.2

Entitled Methods of Installing OS/390

406

25.4

Set Up Standards, Procedures, and Documentation

407

25.4.1Installation Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . 407

25.4.2 Systems Management Procedures . . . . . . . . . . . . . . . . . . . 409

25.4.3Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412

25.5 Customize Your New OS/390 System . . . . . . . . . . . . . . . . . . . . 413

25.5.2MVS BCP Customization . . . . . . . . . . . . . . . . . . . . . . . . . 415

25.5.3Other OS/390 Elements . . . . . . . . . . . . . . . . . . . . . . . . . . 416

Chapter 26. Test Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . 419

26.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419

26.1.1 Differences in Testing ²Philosophy²

. . . . . . . . . . . . . . . . . . 419

26.1.2Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 419

26.2 Test Systems in the Life of the Migration . . . . . . . . . . . . . . . . . . 420

26.3VM, LPAR, or Standalone Systems . . . . . . . . . . . . . . . . . . . . . 421

26.3.1Logical Partitioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422

26.3.2Software Partitioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 423

26.3.3Our Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . 424

26.3.4Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430

26.4Parallel Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 430

26.4.2

Synchronizing VSE Applications with OS/390 Versions

430

26.5 Building the Initial OS/390 Test System

430

26.5.1

OS/390 Maintenance Environment

431

26.5.2

OS/390 Test Logical Partition

431

26.5.3

Maintaining Your OS/390 Libraries and SMP/E Zones

431

26.6 Shared DASD vs. Cloned DASD

432

26.6.1

Shared DASD between OS/390 Test Systems (vs. Cloned DASD) .

432

26.6.2

Shared DASD between VSE and OS/390 (vs. Cloned DASD) . . . .

433

 

 

Part 6. Running Your OS/390 System

435

Chapter 27. Orienting ICCF Users to TSO/ISPF

437

27.1TSO/ISPF and SDSF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 437

27.1.1Editing Data Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438

27.1.2Submitting Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439

27.1.3Using ISPF Utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439

27.1.4 Creating and Executing ISPF Applications . . . . . . . . . . . . . . . 440

27.1.5Managing Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440

27.1.6Tracking Jobs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441

27.1.7Retrieving Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441

27.1.8Using SDSF for Operators . . . . . . . . . . . . . . . . . . . . . . . . 441

Chapter 28. Orientation to OS/390 Console Operation . . . . . . . . . . . . . 443

28.1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443

28.1.1Operating Hardware Consoles . . . . . . . . . . . . . . . . . . . . . . 443

28.2 Understanding the Operator Interfaces

443

28.2.1 Controlling Consoles

. . . . . . . . . . . . . . . . . . . . . . . . . . .

444

xiiVSE to OS/390 Migration Workbook

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IBM manual Orienting Iccf Users to TSO/ISPF, Orientation to OS/390 Console Operation

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.