Training Offering

z/OS System Services Structure


Price £2,975 before tax
Length: 4.5 Days
Lunch : Included
Courseware : Included
Course code: ES20G
Delivery Type Classroom

Session dates

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Date Location
  • London (Arrow)
    £2,975 before tax
This training is also available as onsite training. Feel free to contact us for more information.


This course presents the structure and control blocks of the z/OS BCP and system services. It prepares the new z/OS system programmer to identify potential bottlenecks and performance problems, perform initial error symptom gathering, and identify opportunities and requirements for tailoring a z/OS system. This course also provides prerequisite information needed for further training in specialized areas such as system measurement and tuning and system problem determination.


  • Explain the MVS functions and control blocks necessary to support a task in a multitasking and multiprocessing environment

  • Describe the software and hardware functions that allow a program to interact with programs running in other address spaces, use data in other address spaces, and use data in data spaces

  • Trace the flow of an I/O operation from the initial request in the application program through the completion of data transfer

  • Identify the control blocks that describe the current status of an I/O request

  • Describe the functions of the z/OS BCP Virtual, Real, and Auxiliary Storage Managers

  • Describe the functions performed by the Recovery Termination Manager and recovery management components to minimize failure impact and enhance error correction

  • Select the appropriate IBM publication to provide further technical information (SRLs, Technical Bulletins, Self-study and other z/OS courses)

  • Describe the services provided by cross system extended services (XES)

  • Identify and explain the purpose of the cache, list, and lock structures

  • Plan the implementation of the global resource serialization STAR environment.0.2 pref


The primary audience for this intermediate course are z/OS system programmers who are new to z/OS installation, customization, measurement and tuning, or problem determination. Subsystem programmers will also benefit from this class.


You should be able to:

  • Describe the following z/OS BCP (MVS) characteristics:

    • multiprocessing

    • multiprogramming

    • virtual storage and paging

    • and multiple address space/data space architecture

  • Explain how paging and swapping are accomplished through the interaction of real/central, expanded, auxiliary, and virtual storage in a z/OS system

  • Explain the role of the dispatcher, interrupts, SVCs, the program manager, and serialization in managing work in a z/OS system

  • State the role of z/OS software and hardware components in handling an I/O request for data on a direct access storage device

These prerequisites can be met through on the job training or completion of z/OS Facilities.

Note: A fundamental knowledge of hexadecimal notation, assembler language, and z/Architecture instruction execution will enhance your understanding of the course material. Completion of Assembler Language Coding Workshop or Assembler Language Series is recommended.


Day 1

  • Welcome

  • Unit 1 - z/OS system introduction

Day 2

  • Unit 2 - Operating environment initialization

  • Unit 3 - Task management

Day 3

  • Unit 4 - Addressability

  • Unit 5 - Input/Output supervisor

Day 4

  • Unit 6 - Storage management

  • Unit 7 - Recovery termination manager

Day 5

  • Unit 7 - Recovery termination manager (Continued)

Course type

Roadmaps that reference this course are:

•    z/OS Installation, Tuning, JES, and REXX Programming and Problem Diagnosis

•    z/OS Installation, Tuning, JES, and REXX Programming and Problem Diagnosis

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