31.9.3 DFSMSrmm

The diagnosis document for DFSMSrmm is the DFSMS/MVS DFSMSrmm Diagnosis Guide, SY27-9615. It documents how to obtain diagnostic information, eliminate common sources of errors, using the DFSMShsm Problem Determination Aid (PDA) trace formatter program, and building keyword search strings.

Maintaining the DFSMSrmm control data sets and report creation is documented in the DFSMSrmm Implementation and Customization Guide, SC26-4932.

31.9.4 DFSMSdss

The diagnosis publication for DFSMSdss is the DFSMS/MVS DFSMSdss Diagnosis Guide, LY27-9609. It provides information for building keyword search strings, format of the DFSMSdss dump data set, and the DFSMSdss patch area.

31.10 Diagnostic Reference Publications

The following books provide more detailed diagnostic information, and are useful for diagnosing specific problems:

SY28-1082OS/390 MVS Diagnosis: Procedures

SY28-1084OS/390 MVS Diagnosis: Reference

SY28-1085OS/390 MVS Diagnosis: Tools and Service Aids

SY27-9605DFSMS/MVS DFSMSdfp Diagnosis Guide

LY27-9606DFSMS/MVS DFSMSdfp Diagnosis Reference

LY27-9609DFSMS/MVS DFSMSdss Diagnosis Guide

LY27-9607DFSMShsm Diagnosis Guide

LY27-9608DFSMS/MVS DFSMShsm Diagnosis Reference

SC28-1737OS/390 SMP/E Diagnosis Guide

SY27-2639OS/390 Security Server (RACF) Diagnosis Guide

SY28-1086OS/390 JES2 Diagnosis

GC28-1790OS/390 JES2 Commands

SC33-6592OS/390 RMF Diagnosis Guide

LY43-0078VTAM Diagnosis

LY43-0105TCP/IP for MVS: Diagnosis Guide

G544-5462PSF/MVS: Diagnosis Guide and Reference

478VSE to OS/390 Migration Workbook

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IBM OS/390 manual DFSMSrmm, Diagnostic Reference Publications
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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.
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