z/OS Internals
5 days

This course provides a detailed examination of z/OS for systems programmers. Topics include an introduction to computer systems hardware and an exploration of architecture, system services and functions, storage management mechanisms, and I/O processes. Each section will also explore the associated control block structures associated with the operations being looked at.

Experienced systems programmers with a need for a more detailed understanding of z/OS functions. Due to the technical nature of this material, the student should have several years experience in the OS/390 environment.


Introduction to Computer Systems Architecture
  • Examine processor architecture and its role in supporting z/OS facilities.
  • Introduction to storage hierarchy: L1 and L2 cache memories and various architectural enhancements to enable processors to achieve their rated speeds.
  • Review of processor power ratings and their associated metrics.
OS/390 Architecture
  • Interrupt handling and SVC functions
  • Address space structure
  • Cross memory services
  • Logical partitioning (LPAR)
System Initialization (IPL)
  • IPL process details
  • IPL Program functions
  • Nuclear Initialization Program
  • Master Scheduler Initialization
System Services and Functions
  • Role of OS/390 Dispatcher
  • Task management
  • Resource serialization
  • Recovery/Termination management
  • Virtual Lookaside Facility (VLF)
Storage Management Mechanisms
  • Real storage management:
    • Central and expanded storage usage
  • Virtual storage management:
    • Paging/Swapping mechanisms
  • Auxiliary storage management
I/O Processing
  • Introduction to DASD hardware functions:
    • CKD, ECKD, and FBA devices
    • Parallel Access Volumes (PAV)
    • Volume Affinity
  • Components of I/O operation:
    • Introduction to channel command processing
  • Access method services
  • Caching mechanisms
Exploitation Opportunities
  • Dataspaces/Hiperspaces
    • Access register usage
  • Batchpipes
  • Hiperbatch/DLF
  • Batch LSR
  • Parallel sysplex
  • Data buffering
Workload Management
  • Introduction to WLM Goal mode
  • Metrics associated with performance objectives
  • Basic control mechanisms of WLM
z/OS Features/Functions
  • 64-bit storage addressability
  • WLM enhancements
    • Intelligent Resource Director
    • Workload licensing

Our z/OS experts can cover any and all topics on this subject—topics can be added or deleted per Client’s needs.


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