IBM大型机培训资料之

1、OS390 & z/OS An Introduction,What is IBM Mainframe?,Mainframe Large, Powerful, Central computer capable of supporting many hundreds or thousands of users simultaneously IBM Mainframe Specify the series of computers produced by IBM,Advantages,Reliability Recoverability Redundancy Connectivity Concurr

2、ency Capacity Security Compatibility .,History,1960s System 360 Overall Services Over 10 models offered Architecture innovations for future upward compatibility Base-register addressing mode Microprogramming 1970s System 370 MVS Virtual Storage (24-bit) Multi-processing Two compatible product lines

3、30XX - large systems 43XX - mid-range systems,History,1980s System 370/XA MVS/XA Virtual Storage (31-bit) Expanded storage added to 3090 model - a new form of processor storage, separate from main storage Mid 1980s ESA 370 (Enterprise System Architecture) Access to data spaces - another form of virt

4、ual storage MVS/ESA Virtual Storage (N*2G),History,1990s ESA 390 and System 390 ESCON - Enterprise System Connections - fiber optic I/O Parallel Sysplex - coupling capable processors 21st Century ZOS Virtual Storage (64-bit) Intelligent Resource Director (IRD),OS390 Architecture,z/OS Architecture,Ma

5、jor Elements,DFSMS Storage Management Data Management Device Management SDSF System Display and Search Facility Optional feature of OS/390 Monitor, manage and control MVS/JES2 system TSO Time Sharing Option Allows users to interactively share computer time and resources,Major Elements,DITTO Data Int

6、erfile Transfer Testing and Operations Utility Allows users to display, modify, delete, copy, print physical records of a VSAM or sequential file NETVIEW IBMs foundation for enterprise management Network management products provides tools for managing complex multi-vendor networks from a single poin

7、t of control SDFII Interactive tool Helps you develop and maintain panels, panel groups, partition sets and control tables,Major Elements,VTAM Virtual Telecommunications Access Method Provides interface between applications in a host processor and other resources in an SNA network TCP/IP JES2 Job En

8、try Subsystem Provides functions to get jobs into, and output out of the OS/390 system RACF Resource Access Control Facility Component of the OS/390 security server,RACF,Major Elements,UNIX System Services Application Services Enables two open systems interfaces on the OS/390 operating system: An Ap

9、plication Program Interface (API) An interactive OS/390 shell interface,Uniprocessor,MultiProcessor,Partitioning Multiprocessor,Logical Partitioning -LPAR,SYSPLEX,S Y S P L E X,X C F,XCF,XCF COUPLE DATA SET,System Initialization,Load Parms from SYS1.PARMLIB Members from SYS1.NUCLEUS Initial Program

10、Load Build first address spaces and other system address spaces Initial master catalog and system datasets,Load Parameter,Load IPL,Load nucleus Load selected members of SYS1.NUCLEUS Nucleus Initialization Program (NIP) receives control from the IPL program Locate master catalog and other data sets,B

11、uild Address,Initialize MVS using SYS1.PARMLIB IEASYS0X Build first address space Create Link Pack Area Set the CSA and SQA boundaries Create the Master Scheduler address Address space CREATE routines Master Trace Table trace OS/390 console message,Build Address,Create other Address Spaces,Master Sc

12、heduler PC/AUTH Trace GRS DUMPSRV IOSAS Console LLA VLF APPC ASCH RACF RMF Catalog,Additional System Address Spaces,JES SMS VTAM DB2 TSO CICS .,System Datasets,Storage Manager,RSM (Real Storage Manager) ASM (Auxiliary Storage Manager) VSM (Virtual Storage Manager),Physical and Virtual Storage,Centra

13、l Storage (Main Storage) Expanded Storage Page Data Sets PLPA Common Local Virtual Storage Address Space Data Space Hiperspace,Storage Structure,CP CACHE,Centre Storage,EXPANDED,DASD CACHE,DASD/CARTRIDGE TAPE,Address Space Layout,Swapping and Paging,Paging: The process of bring inactive portions of

14、a program from auxiliary storage into main storage and moving previously active portion out of main storage to auxiliary storage Page Out Page In Swapping: To maintain a supply of free page frames, MVS transfers all the active pages of address spaces in and out of an auxiliary storage, when the dema

15、nd for memory is particularly high Swap Out Swap In,Data Spaces vs. Hiperspaces,z/OS Storage Management,64-bit long address No expanded storage,Data Management,Catalog Processing DASD Volume Organization Allocating New DASD Data Sets SMS Facilities,Catalogs,Catalog Search Order,/STEPCAT /JOBCAT Alia

16、ses in USERCAT Master Catalog,DASD Volume Organization,VTOC Volume Table of Contents Describes the contents of the direct access volume Contains entries called DSCBs VTOC Index provides improved performance VVDS Describes VSAM data set information,SMS Facility,DFSMSdfp DFSMSdss DFSMShsm DFSMSrmm,Dat

17、aset Types,Physical Sequential (PS) Partitioned Data Set (PDS) Partitioned Data Set Extended (PDS/E) Virtual Storage Access Method (VSAM) Linear Data Set(LDS) Relative Record Data Set(RRDS) Entry Sequenced Data Set(ESDS) Key Sequenced Data Set(KSDS) ,Job Management,The Job Entry Subsystem (JES) is r

18、esponsible for managing jobs in an OS/390 system,Job Phases,Input Conversion Processing Output Hardcopy Purge,Input Phase,All user jobs enter the system from a JES2-controlled reader Acquires spool space for the job Syntax checks the JOB statement Spools JCL and SYSIN data for the job Records the jo

19、b as being in the system,Conversion Phase,Merges invoked procedure JCL into the job stream Checks the resulting job stream for syntax errors Substitutes default values to uncoded JCL parameters Converts and stores JCL as converter / interpreter text,Processing Phase,To assist user jobs in accomplish

20、ing their work, JES2 Selects jobs for initiation and execution based on: Initiator availability Job CLASS Selection PRIORITY JES2 spools / de-spools for the jobs and monitors job duration,Output Phase,JES2 optimizes the utilization of unit record devices and simplifies their operation Groups the job

21、s SYSOUT data set according to output class and characteristics of the SYSOUT data sets,Hardcopy Phase,Selects SYSOUT data sets according to: Availability of the devices Output class Characteristics of the SYSOUT data set Transcribes the data to line-mode printers and punchers Interacts with PSF, wh

22、ich transcribes the data to page-mode printers,Purge Phase,When all of a jobs SYSOUT have been transcribed (or cancelled): Its spool space is reclaimed for re-use The job disappears from the system,Work Management,Services of Supervisor Linkage Search order Dispatching Interrupt Handling Supervisor

23、Calls Inter-address space communications Serialization,Balancing Resources,Balancing Resources,System Resource Manager (SRM) Work Load Management (WLM) Work Mode z/OS delivers the Intelligent Resource Director (IRD). Its a new concept. Instead of assigning applications to a resource, it assigns reso

24、urces to the application.,Managing Work,System Management Facility Data collection component of OS/390 Records system and job-related information Resource Management Facility Monitors selected areas of system activity Presents data collected in the form of printed reports and visual displays,RMF Types,RMF Monitor I RMF Monitor II RMF Monitor III,I/O