System z: Complex System and Availability Recovery Concepts Eğitimi

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3 Days ILT    

System z: Complex System and Availability Recovery Concepts (ESB0G)

IBM Course Code: ESB00

This course teaches you the operation and recovery of the z/OS system and hardware recovery at the operations level.

It describes and explains mainframe concepts relating to processor components, channel subsystem, operating systems, and zArchitecture storage concepts. It identifies and explains z/OS console usage, operator commands, initial program load (IPL) activities, and compares ESCON, FICON, and zHPF command structure.

This course enables you to acquire the skills necessary to navigate the Hardware Management Console (HMC) to perform daily tasks and advance usage tasks on the HMC and support element to perform problem analysis and other monitoring functions. The focus is on the tree user interface in the lecture and lab materials.

This course also teaches you how to use MVS commands to identify, determine and manage various system resources, such as console usage, CPs, CHPIDs, and I/O resources.

The course explains system level recovery options for enabled, disabled, and excessive spin loops, hot I/Os, missing interrupts, start pending, DASD reserves and boxed I/O conditions, enabled and disabled wait states, and PSW restart actions. It identifies why these actions occur, how the system can automatically resolve them, and if they are not resolved, what potential operator recovery actions can be used.

In addition, the course identifies the IPL sequence describing the various phases during a z/OS IPL. It describes how ESCON, FICON, and System z High Performance FICON (zHPF) channel programs operate. It identifies the command structure using channel command words (CCWs) and transport command words (TCWs) and compares the differences between ESCON, FICON and, zHPF channel operations.

The emphasis is on using the knowledge on how the system interacts with its various components, HMC, consoles, and other system resources to quickly identify and resolve system level recovery problems as described in this course.

What You'll Learn

  • Identify basic mainframe concepts that include:
    • What is it, what does it do, and how does it do it
    • Commonly used terminology
  • Describe and compare various System z components:
    • Frame layout and cage usage
    • Server models, books, memory, and cache structure
    • Performance and millions of service units (MSUs)
  • Describe how and what System z physical components are used when processing instructions and performing an I/O operation
  • Identify System z capacity on demand (CoD) options available for planned and unplanned outages
  • Describe logical partitioning, resource assignments, and initialization activities
  • Describe mainframe channels, usage, and CHPID assignments
  • Hardware configuration definition (HCD) concepts to define and modify the I/O configuration
  • Describe the purpose and use of HCD
  • Identify how and when subchannels and unit control blocks (UCBs) are created during the power-on reset (POR) and initial program load (IPL) process
  • Identify mainframe operating systems and their supported servers
    • Describe how the mainframe OS evolved from the System 360 servers to the current z196 server
    • List some of the major enhancements provided by the recent z/OS versions and to what servers they apply
  • Identify processor architectural modes and their supported addressing implementations
  • Describe zArchitecture storage concepts as they relate to:
    • Storage types: Real, auxiliary, and virtual
    • Address spaces, virtual addressing, and overall storage use and management
  • Display z/OS address spaces and identify their status
  • Explain the role of the HMC, SE, and version numbers
  • Identify the purpose and use of the HMC default IDs
  • Compare the two HMC user interfaces and provide HMC recommendations
  • Describe the layout of the HMC using the tree UI
  • Navigate the HMC using various selection techniques
  • Identify task lists, online books, and other available help functions
  • Build and customize user defined groups
  • Build, identify, and assign profiles
  • Determine object status using details window
  • Determine exception conditions and hardware messages details
  • Use the activate and load tasks to IPL images
  • Use the operating system messages task to respond and issue commands to the z/OS
  • Use the classic UI to perform operational tasks, such as grouping, activation, and determining exception conditions
  • List new functions and enhancements for version 2.11.0 and 2.11.1
  • Retrieve H/W messages that were previously viewed and deleted
  • Change table layouts, find any task, and identify open tasks or users causing potential problems
  • Describe how customized IDs can be created with restricted access
  • Describe channel PD tools and CP options available from the SE
  • Determine message format and if operator action is required
  • Use commands to determine system information and I/O status
  • Interpret the results of various I/O related commands
  • Identify console configuration (2074 and OSA-ICC) and use of MCS channel attached consoles
  • Describe commonly used console display and action type commands
  • Describe the purpose and use of the CONSOLxx member, SYSCONS, and AUTOACT
  • Identify and resolve console conditions for:
    • WTO and WTOR buffer shortages
    • Command flooding and console hardware error messages
  • Determine when and why a synchronous WTOR message has occurred and identify recovery actions
  • Identify the conditions that can cause a hot I/O
  • Describe spin loops and automated spin loop recovery
  • Perform recovery actions that require operator response for hot I/O and spin loops
  • Define the purpose and use of the PSW restart task
  • Identify enabled/disabled wait states and loops causing system problems
  • Determine potential operator recovery actions for wait states and looping conditions
  • Describe the purpose of MIH, DASD reserves, IOT, and global resource serialization
  • Use commands to determine and resolve MIH, start pending, and DASD reserve conditions
  • Identify device boxing conditions and potential recovery actions
  • Identify and describe three major phases of an IPL process:
    • Hardware phase
    • IRIMs phase
    • NIP phase
  • Identify potential problems and recovery actions for each phase of the IPL
  • Explain what High Performance FICON is and the benefits it provides
  • Describe channel operations and command structure for ESCON, FICON, and zHPF
  • Describe the use of the Interrogate function and why it is needed

Who Needs to Attend

This course is for operations personnel and tech support staff who are directly involved in the operation and system support of the z/OS System z environment.


  • Basic data processing concepts
  • I/O concepts
  • MCS console operation, including display of device, job, and console status

You should complete:

  • An Introduction to the z/OS Environment (ES050)

or have equivalent on-the-job training

Follow-On Courses

There are no follow-ons for this course.

Course Outline

Day 1

  • Welcome
  • Unit 1: Server hardware and processor concepts
  • Unit 2: OS overview and z/Architecture storage concepts
  • Hands on lab

Day 2

  • Review
  • Unit 3: Hardware Management Console basics
  • Unit 4: HMC advanced topics
  • Unit 5: Commands
  • Hands on lab

Day 3

  • Review
  • Unit 6: z/OS consoles
  • Unit 7: System level recovery actions
  • Hands on lab

Day 4

  • Review
  • Hands on lab
  • Unit 8: z/OS IPL and channel operations
  • Wrap up

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