z OS for Beginners

2 days


This course will introduce delegates to the z/OS operating system and the IBM systems on which it runs. It covers z/OS terminology and explains the main concepts employed by z/OS in performing its functions.


This course is designed for anyone requiring a basic understanding of z/OS as an operating system. It also provides a useful introduction for delegates requiring more in-depth training in other areas of the IBM Mainframe including TSO, JCL, z/OS, COBOL, PL/1, Assembler, REXX etc...


There are no prerequisites for this course.

Course Outline

  • z/OS Introduction
  • Brief history.
  • What is z/OS:
  • Basic processor resources.
  • Storage development.
  • z/OS and I/O Devices.
  • Principal software components. z/OS Objectives:
  • Control of work.
  • Control of resources.
  • Operator communication.
  • Support for Applications.
  • I/O Processing.
  • Task Processing.


  • Hardware Platform
  • PR/SM and LPARs.
  • z/Series processors.
  • I/O Processing – Hardware perspective:
  • Cartridges / Disks.

Other peripherals.

Modern disks versus old technology.

  • z/OS Structure
  • Task Management:
  • Multi-tasking.
  • Multi-processing.
  • The dispatcher and dispatching priorities. Input/Output - process z/OS perspective. Virtual Storage Operation. Address Spaces. Common areas. System Address Spaces. Sub-systems:
  • Started Tasks.

Work-load Manager.

  • Data in z/OS
  • Internal representation.
  • Error correction.
  • Data Sets:
  • Data set composition.
  • Data set naming and location. Catalogue Structure. VTOC structure. Data Set Structures:
  • Data organisations and access methods.
  • Record formats.
  • Buffering. Portioned Data Sets and PDSE. Virtual Storage Access Method:


  • Running Work in z/OS
  • Batch processing:
  • JES2 versus JES3.
  • JES2 Overview.
  • JES2 Job Submission. System Networks:
  • SNA – VTAM.
  • TCP/IP.
  • Network management. On-line processing:
  • TSO and ISPF.
  • CICS overview. Databases:
  • DB2 plus others. Applications Development:
  • Programming Languages.
  • Compile stages.
  • CICS and DB2 requirements.

More modern languages.

  • JCL Overview
  • Sample job.
  • JOB statement explanation.
  • EXEC statement explanation.
  • Various DD statements explained.
  • Mention of IF/ELSE logic.
  • UNIX System Services
  • Rationale for Open Systems.
  • The UNIX Environment in z/OS:

HFS Data Sets.

Accessing the UNIX environment.

  • z/OS Facilities
  • DFSMS family of products.
  • Aims of Storage Management.
  • ACS Routines.
  • HSM's role.
  • SMS and non-SMS Allocation processes.
  • Global Resource Serializtion.
  • Data in Memory:
  • LLA, DLF and VLF. System Management Facility (SMF). System Security:

RACF and its database.

  • z/OS Commands
  • PR/SM Review:
  • IPL, IML and HMC.

Auomatic commands from Parmlib members.

Managing tasks.

Managing devices.

Starting and stopping z/OS.

  • JES2 Commands
  • Starting JES2.
  • Managing initiators.
  • Managing JOBs/Tasks.
  • Managing Input queues.
  • Managing Output queues.
  • Stopping JES2.
  • Diagnostic Aids
  • Quality approach.
  • Consoles and their functions and types.
  • Messages:
  • Message Structure.
  • Message Routing.
  • Automated Operations. Abend Codes:
  • System Abends.
  • Program interrupts.
  • User Abends.

Error handlers.

Dumps and their analysis.


  • z/OS Maintenance
  • The installation process.
  • Maintenance terminology.
  • Maintenance application process.

Thinking about Onsite?

If you need training for 3 or more people, you should ask us about onsite training. Putting aside the obvious location benefit, content can be customised to better meet your business objectives and more can be covered than in a public classroom. It's a cost effective option.

Submit an enquiry from any page on this site, and let us know you are interested in the requirements box, or simply mention it when we contact you.

Upcoming Dates

  • GREEN This class is Guaranteed To Run.
  • SPVC - Self-Paced Virtual Class.
  • Click a Date to Enroll.
Course Location Days Cost Date
Onsite2 800 £800 2019-07-20
Bristol1 1250 £1250 2019-10-07
Bristol2 6250 £6250 2019-10-14
Bristol2 5000 £5000 2019-10-14
Bristol1 1250 £1250 2019-10-17
Bristol2 5000 £5000 2019-10-28
Bristol1 2500 £2500 2019-10-29