2. 1 z/OS Overview Stephen S. Linkin Houston Community College © HCCS and IBM 2008 ©HCCS & IBM® 2008 Stephen Linkin

3. 2 What Is An Operating System?

4. ©HCCS & IBM® 2008 Stephen Linkin3 What Is z/OS?  Hardware Resources Used By z/OS The Standard Reference For Descriptions Of The Major Facilities of z/Architecture is the IBM’s z/Architecture Principles of Operation. http://www.ibm.com/servers/eserver/zseries/zos/bkserv/

5. ©HCCS & IBM® 2008 Stephen Linkin4 What Is z/OS?

6. ©HCCS & IBM® 2008 Stephen Linkin5 What Is z/OS?  Multiprogramming And Multiprocessing

7. ©HCCS & IBM® 2008 Stephen Linkin6 What Is z/OS?  Modules And Macros

8. ©HCCS & IBM® 2008 Stephen Linkin7 What Is z/OS?  Control Blocks System-related control blocks Resource-related control blocks Job-related control blocks Task-related control blocks

9. ©HCCS & IBM® 2008 Stephen Linkin8 What Is z/OS?  Physical Storage Used By z/OS

10. ©HCCS & IBM® 2008 Stephen Linkin9 Overview Of Z/OS Facilities

11. ©HCCS & IBM® 2008 Stephen Linkin10 Virtual Storage And Other Mainframe Concepts  What Is Virtual Storage?

12. ©HCCS & IBM® 2008 Stephen Linkin11 Virtual Storage And Other Mainframe Concepts  What Is An Address Space? Address Space Isolation

13. ©HCCS & IBM® 2008 Stephen Linkin12 Virtual Storage And Other Mainframe Concepts  What Is An Address Space? Address Space Isolation Address Space Communication http://www.ibm.com/servers/eserver/zseries/zos/bkserv/

14. ©HCCS & IBM® 2008 Stephen Linkin13 Virtual Storage And Other Mainframe Concepts  What Is An Address Space? Address Space Isolation Address Space Communication  What Is Dynamic Address Translation?  Virtual Storage Overview

15. ©HCCS & IBM® 2008 Stephen Linkin14 Virtual Storage And Other Mainframe Concepts  What Is An Address Space? Address Space Isolation Address Space Communication  What Is Dynamic Address Translation?  Virtual Storage Overview Format Of A Virtual Address

16. ©HCCS & IBM® 2008 Stephen Linkin15 Virtual Storage And Other Mainframe Concepts  What Is An Address Space? Address Space Isolation Address Space Communication  What Is Dynamic Address Translation?  Virtual Storage Overview Format Of A Virtual Address

17. ©HCCS & IBM® 2008 Stephen Linkin16 Virtual Storage And Other Mainframe Concepts  Virtual Storage Overview Format Of A Virtual Address How Virtual Storage Addressing Works In z/OS

18. ©HCCS & IBM® 2008 Stephen Linkin17 Virtual Storage And Other Mainframe Concepts

19. ©HCCS & IBM® 2008 Stephen Linkin18 Virtual Storage And Other Mainframe Concepts  Virtual Storage Overview Format Of A Virtual Address How Virtual Storage Addressing Works In z/OS Frames, Pages, And Slots

20. ©HCCS & IBM® 2008 Stephen Linkin19 REALVIRTUAL Virtual Storage And Other Mainframe Concepts  What Is Paging? How Paging Works In z/OS

21. ©HCCS & IBM® 2008 Stephen Linkin20 Virtual Storage And Other Mainframe Concepts  What Is Paging? How Paging Works In z/OS Page Stealing Unreferenced Interval Count

22. ©HCCS & IBM® 2008 Stephen Linkin21 Virtual Storage And Other Mainframe Concepts  Swapping And The Working Set  What Is Storage Protection?

23. ©HCCS & IBM® 2008 Stephen Linkin22 Virtual Storage And Other Mainframe Concepts  Swapping And The Working Set  What Is Storage Protection? How Storage Protect Keys Are Used

24. ©HCCS & IBM® 2008 Stephen Linkin23 Virtual Storage And Other Mainframe Concepts  Swapping And The Working Set  What Is Storage Protection? How Storage Protect Keys Are Used How Storage Protect Keys Are Assigned

25. ©HCCS & IBM® 2008 Stephen Linkin24 Virtual Storage And Other Mainframe Concepts  Role Of Storage Managers Real Storage Manager Auxiliary Storage Manager Virtual Storage Manager

26. ©HCCS & IBM® 2008 Stephen Linkin25 Virtual Storage And Other Mainframe Concepts  A Brief History Of Virtual Storage And 64-bit Addressability

27. ©HCCS & IBM® 2008 Stephen Linkin26 Virtual Storage And Other Mainframe Concepts  A Brief History Of Virtual Storage And 64-bit Addressability

28. ©HCCS & IBM® 2008 Stephen Linkin27 Virtual Storage And Other Mainframe Concepts  A Brief History Of Virtual Storage And 64-bit Addressability

29. ©HCCS & IBM® 2008 Stephen Linkin28 Virtual Storage And Other Mainframe Concepts  What Is “Below-the-line Storage”?

30. ©HCCS & IBM® 2008 Stephen Linkin29 Virtual Storage And Other Mainframe Concepts  What’s In An Address Space?

31. ©HCCS & IBM® 2008 Stephen Linkin30 Virtual Storage And Other Mainframe Concepts  System Address Spaces And The Master Scheduler

32. ©HCCS & IBM® 2008 Stephen Linkin31 What Is Workload Management?  What Does WLM Do? Goal Achievement Throughput Response And Turnaround Time

33. ©HCCS & IBM® 2008 Stephen Linkin32 What Is Workload Management?  What Does WLM Do? Goal Achievement Throughput Response And Turnaround Time  How Is WLM Used?

34. ©HCCS & IBM® 2008 Stephen Linkin33 What Is Workload Management?  What Does WLM Do? Goal Achievement Throughput Response And Turnaround Time  How Is WLM Used?

35. ©HCCS & IBM® 2008 Stephen Linkin34 I/O and data management

36. ©HCCS & IBM® 2008 Stephen Linkin35 Supervising Execution Of Work In The System  Tasks Involved Interrupt processing Dispatchable Units Of Work Dispatching Work Serializing Use Of Resources

37. ©HCCS & IBM® 2008 Stephen Linkin36 Supervising Execution Of Work In The System  What Is Interrupt Processing? SVC I/O External Restart Program Machine Check

38. ©HCCS & IBM® 2008 Stephen Linkin37 Supervising Execution Of Work In The System  What Is Interrupt Processing? How Is The Program Status Word Used?  Current PSW  New PSW  Old PSW

39. ©HCCS & IBM® 2008 Stephen Linkin38 Supervising Execution Of Work In The System  What Is Interrupt Processing? How Is The Program Status Word Used?  Current PSW  New PSW  Old PSW Registers And The PSW

40. ©HCCS & IBM® 2008 Stephen Linkin39 Supervising Execution Of Work In The System  Creating Dispatchable Units Of Work What Is A TCB?

41. ©HCCS & IBM® 2008 Stephen Linkin40 Supervising Execution Of Work In The System  Creating Dispatchable Units Of Work What Is A TCB? What Is An SRB?

42. ©HCCS & IBM® 2008 Stephen Linkin41 Supervising Execution Of Work In The System  Preemptable Versus Non-preemptable  What Does The Dispatcher Do?

43. ©HCCS & IBM® 2008 Stephen Linkin42 Supervising Execution Of Work In The System  Preemptable Versus Non-preemptable  What Does The Dispatcher Do?

44. ©HCCS & IBM® 2008 Stephen Linkin43 Supervising Execution Of Work In The System  Serializing The Use Of Resources What Is Global Resource Serialization?

45. ©HCCS & IBM® 2008 Stephen Linkin44 Supervising Execution Of Work In The System  Serializing The Use Of Resources What Is Global Resource Serialization? What Is Enqueuing? What Is Locking?

46. ©HCCS & IBM® 2008 Stephen Linkin45 Supervising Execution Of Work In The System  Serializing The Use Of Resources What Is Global Resource Serialization? What Is Enqueuing? What Is Locking? IT’S MINE

47. ©HCCS & IBM® 2008 Stephen Linkin46 A Brief Comparison Of z/OS And UNIX.

48. ©HCCS & IBM® 2008 Stephen Linkin47 A Brief Comparison Of z/OS And UNIX.

49. ©HCCS & IBM® 2008 Stephen Linkin48 Summary  Read The Redbook