z/OS System Services Structure

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.

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• Explain the MVS functions and control blocks necessary to support a task in a multitasking and multiprocessing environment
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• 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
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• Trace the flow of an I/O operation from the initial request in the application program through the completion of data transfer
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• Identify the control blocks that describe the current status of an I/O request
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• Describe the functions of the z/OS BCP Virtual, Real, and Auxiliary Storage Managers
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• Describe the functions performed by the Recovery Termination Manager and recovery management components to minimize failure impact and enhance error correction
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• Select the appropriate IBM publication to provide further technical information (SRLs, Technical Bulletins, Self-study and other z/OS courses)
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• Describe the services provided by cross system extended services (XES)
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• Identify and explain the purpose of the cache, list, and lock structures
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• Plan the implementation of the global resource serialization STAR environment.0.2 pref
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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:

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• Describe the following z/OS BCP (MVS) characteristics:\n
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  • multiprocessing
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  • multiprogramming
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  • virtual storage and paging
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  • and multiple address space/data space architecture
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• Explain how paging and swapping are accomplished through the interaction of real/central, expanded, auxiliary, and virtual storage in a z/OS system
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• Explain the role of the dispatcher, interrupts, SVCs, the program manager, and serialization in managing work in a z/OS system
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• State the role of z/OS software and hardware components in handling an I/O request for data on a direct access storage device
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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)