Chapter 1 Further Reading: The z/OS Ecosystem

Tier 1: Verified IBM Documentation

These are primary sources available directly from IBM's documentation library. All URLs are to IBM's official documentation sites.

z/OS Fundamentals

IBM z/OS Concepts IBM Publication SC28-3448. The definitive introduction to z/OS architecture, covering address spaces, dispatching, storage management, and system services. Start with chapters on "Work Management" and "Data Management" for the most relevant material to this chapter. Available at: IBM Documentation — z/OS library (https://www.ibm.com/docs/en/zos)

ABCs of z/OS System Programming (13-volume series) IBM Redbook series SG24-6981 through SG24-6990 and beyond. The most comprehensive reference for z/OS systems programming. Volume 1 covers z/OS fundamentals and job management. Volume 3 covers JES2 and JES3. Volume 10 covers Parallel Sysplex. Available at: IBM Redbooks (https://www.redbooks.ibm.com/)

z/OS MVS Planning: Workload Management IBM Publication SA23-1391. The complete reference for WLM concepts, service classes, classification rules, and goal management. Chapter 2 ("Workload Management Concepts") is essential reading for understanding how WLM affects COBOL application performance. Available at: IBM Documentation — z/OS library

Parallel Sysplex

z/OS Parallel Sysplex Overview: Introducing Data Sharing and Parallelism IBM Publication SA22-7661. This is the architectural overview of Parallel Sysplex — coupling facility, XCF, GRS, and data sharing concepts. Read this before diving into subsystem-specific data sharing documentation. Available at: IBM Documentation — z/OS library

Parallel Sysplex Concepts and Planning IBM Redbook SG24-2581. Practical guidance for Parallel Sysplex design and implementation. Includes capacity planning worksheets, coupling facility sizing guidelines, and configuration examples. Particularly relevant: the chapter on coupling facility structure sizing. Available at: IBM Redbooks

z/OS MVS Setting Up a Sysplex IBM Publication SA23-1399. The implementation guide for Parallel Sysplex. While more operational than architectural, the early chapters on Sysplex topology and coupling facility configuration provide essential context for the architecture decisions discussed in this chapter. Available at: IBM Documentation — z/OS library

DB2

DB2 13 for z/OS: Data Sharing — Planning and Administration IBM Publication SC28-4189. The authoritative reference for DB2 data sharing architecture. Chapters on lock structure, group buffer pools, and peer recovery are directly relevant to Section 1.4 of this chapter. Chapter 1 ("Introduction to data sharing") is a required read. Available at: IBM Documentation — Db2 for z/OS library

DB2 for z/OS: What's New? Published with each DB2 release. Tracks the evolution of data sharing capabilities, coupling facility enhancements, and performance improvements across DB2 versions. Useful for understanding which features are available at your DB2 release level. Available at: IBM Documentation — Db2 for z/OS library

CICS

CICS Transaction Server for z/OS: CICS Concepts and Planning IBM Publication SC34-7382 (version varies by CICS TS release). Covers CICS architecture, the quasi-reentrant model, task management, and CICS's interaction with DB2 and MQ. Chapter on "How CICS Manages Its Tasks" explains the dispatcher model described in Section 1.3. Available at: IBM Documentation — CICS TS library

CICSPlex SM: Managing Business Applications IBM Publication SC34-7382. Covers CICSPlex SM's workload management capabilities, including dynamic transaction routing across AORs. Relevant to understanding how CICS distributes transactions in a Parallel Sysplex environment. Available at: IBM Documentation — CICS TS library

MQ

IBM MQ for z/OS: Concepts and Planning IBM Publication SC34-6926. Covers queue-sharing groups, shared queues, and MQ's use of the coupling facility. The chapter on "Shared queues and queue-sharing groups" explains how MQ achieves high availability in a Parallel Sysplex. Available at: IBM Documentation — IBM MQ library

Language Environment

z/OS Language Environment Programming Guide IBM Publication SA38-0682. The primary reference for Language Environment runtime options and their impact on COBOL program behavior. The chapters on storage management and condition handling are particularly relevant. Available at: IBM Documentation — z/OS library

z/OS Connect

IBM z/OS Connect Documentation The current documentation for z/OS Connect (formerly z/OS Connect Enterprise Edition / zCEE). Covers REST API creation, JSON/COBOL data transformation, and connection to CICS, IMS, and DB2. The performance tuning chapter is essential for anyone building APIs that call COBOL programs. Available at: IBM Documentation — z/OS Connect library

Tier 2: Attributed Community and Industry Sources

These sources represent established knowledge in the mainframe community. While not primary IBM documentation, they are widely referenced by practitioners.

Books

z/OS Basics by IBM (available as a free download from IBM's academic initiative) An introductory text that covers z/OS architecture at a level accessible to newcomers. While this chapter goes deeper, the z/OS Basics text provides good supplementary illustrations and examples.

MVS JCL Reference — IBM Publication SA23-1385 While JCL is covered in your prerequisite knowledge, the reference manual's chapter on dataset disposition (DISP parameter) is worth reviewing in light of the GRS and Sysplex serialization discussion in this chapter.

Technical Articles and Blogs

IBM Systems Magazine (archived) — formerly IBM Systems Magazine, now IBM Z and LinuxONE Community Published technical articles on Parallel Sysplex architecture, WLM tuning, and DB2 data sharing. The archives contain decades of practitioner-written content. Search for articles by Frank Kyne (Sysplex), John Campbell (WLM), and Chris Crone (DB2 data sharing) for expert perspectives.

SHARE Conference Proceedings — https://www.share.org SHARE, the oldest and largest IBM user group, publishes conference presentations from its semi-annual meetings. Presentations on Parallel Sysplex, DB2 data sharing, and CICS performance are presented by IBM developers and experienced practitioners. Search the proceedings archive for presentations tagged "Parallel Sysplex" or "Data Sharing."

CMG (Computer Measurement Group) Publications — https://www.cmg.org CMG focuses on performance and capacity management. Their conference proceedings and journal include technical papers on z/OS WLM tuning, coupling facility sizing, and performance modeling — topics directly relevant to the architecture decisions in this chapter.

Community Resources

IBM Z and LinuxONE Community — https://community.ibm.com/community/user/ibmz-and-linuxone/home IBM's community platform for z/OS practitioners. Discussion forums, blogs, and technical content from IBM staff and experienced users.

Planet Mainframe — https://planetmainframe.com Industry news and technical articles about mainframe technology. Covers z/OS releases, IBM hardware announcements, and mainframe modernization strategies.

Suggested Reading Order

For readers new to z/OS internals, the following reading sequence builds knowledge progressively:

  1. IBM z/OS Concepts (SC28-3448) — Chapters 1-4 (foundational concepts)
  2. ABCs of z/OS System Programming, Volume 1 — Chapters 1-3 (z/OS fundamentals)
  3. z/OS Parallel Sysplex Overview (SA22-7661) — Complete document
  4. DB2 13 for z/OS: Data Sharing (SC28-4189) — Chapter 1 ("Introduction")
  5. CICS Concepts and Planning — Chapters on task management and DB2 attachment
  6. z/OS MVS Planning: Workload Management (SA23-1391) — Chapter 2

This sequence should take approximately 20-30 hours of focused reading and provides the conceptual foundation for the remainder of this book.