Mainframe

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z/OS Basic Skills Information Center

Mainframe concepts

z/OS Basic Skills Information Center

Mainframe concepts

Note Before using this information and the product it supports, read the information in “Notices” on page 45.

This edition applies to z/OS (product number 5694-A01). We appreciate your comments about this publication. Comment on specific errors or omissions, accuracy,organization, subject matter, or completeness of this book. The comments you send should pertain to only the information in this manual or product and the way in which the information is presented. For technical questions and information about products and prices, contact your IBM branch office, your IBM business partner, or your authorized remarketer. When you send comments to IBM, you grant IBMa nonexclusive right to use or distribute your comments in any way it believes appropriate without incurring any obligation to you. IBM or any other organizations will only use the personal information that you supply to contact you about the issues that you state on this form. Send your comments through this Web site: http://publib.boulder.ibm.com/infocenter/zoslnctr/v1r7/index.jsp?topic=/com.ibm.zcontact.doc/webqs.html © Copyright International Business Machines Corporation 2005, 2008. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

Contents
Introduction to the mainframe . . . . . v Chapter 1. The value of the mainframe today . . . . . . . . . . . . . . . . 1
The S/360: A turning point in mainframehistory . . 1 Mainframe architecture: Secure, compatible, and still evolving . . . . . . . . . . . . . . . . 2 Mainframes in our midst: You use one every day . . 3 What is a mainframe? It’s a style of computing . . . 4 Who uses mainframes and why do they do it? . . . 6 Mainframe strengths: Reliability, availability, and serviceability . . . . . . . . . . . . . 7 Mainframe strengths: Security . . . . .. . 8 Mainframe strengths: Scalability . . . . . . . 8 Mainframe strength: Continuing compatibility . . 9 Mainframe workloads: Batch and online transaction processing . . . . . . . . . . . . . . . 9 Mainframes working after hours: Batch processing . . . . . . . . . . . . . . 10 Mainframes working with you: Online transaction processing (OLTP) . . . . . . . 12 Roles in the mainframe world . . . . .. . . 14 Who is the system programmer? . . . . . . 15 Who is the system administrator? . . . . . . 16 Who are the application designers and programmers? . . . . . . . . . . . . 17 Who is the system operator? . . . . . . . . 18 Who is the production control analyst? . . . . 18 What roles do vendors play? . . . . . . . 19 What are mainframe operating systems? . . . . . 19 Mainframe operatingsystem: z/OS . . . . . 20 Mainframe operating system: z/VM . . . . . 20 Mainframe operating system: z/VSE . . . . . 21 Mainframe operating system: Linux for System z 21 Mainframe operating system: z/TPF . . . . . 22

Chapter 2. Mainframe hardware concepts . . . . . . . . . . . . . . 23
Mainframe hardware: Terminology . . . . . Mainframe hardware: Evolving design . . . . Mainframe hardware: I/Oconnectivity . . . Mainframe hardware: System control and partitioning . . . . . . . . . . . . Mainframe hardware: Logical partitions (LPARs) Mainframe hardware: Consolidation of mainframes . . . . . . . . . . . . Mainframe hardware: Processing units . . . . Mainframe hardware: Multiprocessors . . . . Mainframe hardware: Disk devices . . . . . . 23 . 24 . 26 . 28 30 . . . . 30 31 32 33

Chapter 3.Mainframe configurations: Large, medium and small (yes, small) . 35 Chapter 4. Clustering on the mainframe: Parallel Sysplex and other techniques . . . . . . . . . . . . . 39
Clustering technique: Basic shared direct access storage devices (DASD) . . . . . . . . . Clustering technique: Channel-to-channel (CTC) rings. . . . . . . . . . . . . . . . Clustering technique: Parallel Sysplex . . . . . 39...
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