DOCSLIB.ORG

IBM Z/OS V2R2: Performance

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
IBM Z/OS V2R2: Performance EPV Technologies Newsletters June 2020 - Number 06 1) Tech Papers- Are you wasting money because of SIIS? A big part of performance analysts time is dedicated to find and tune system components and applications which use an excessive amount of resources, especially CPU. The CPU usage is important because it determines a large portion of z/OS hardware and software costs. When the software pricing is based on the monthly peak of the MSUs used in 4-hour rolling average the analysts focus mostly on the workloads contributing to those peaks. With the advent of TFP (Enterprise Consumption solution) the situation is changing: all the MSUs are now relevant for the software bill, no matter the time of the day when they are used. So, with TFP, identifying and eliminating any MSU waste has become even more important than before. In the last machine generations, IBM has identified the “Store Into Instruction Stream” (SIIS) issue as possible reason for a reduction of the processor cache effectiveness and a consequent significant increase of CPU utilization. In this paper, after a short overview of the SIIS issue we will provide formulas and report examples to help you understand how relevant are the number of MSUs wasted in your systems because of SIIS events. We will also provide suggestions on what you need to do to identify SIIS culprits. If you want to receive the paper you can reply to this e-mail writing "Are you wasting money because of SIIS?" in the subject 2) Tech Events - EPV User Group 2020 The XVIII EPV User Group will be a “virtual” user group. To allow for the widest possible participation, all sessions will be repeated twice and spread across four days from 21st to 24th September. The EPV User Group is a "not to miss" event for all Performance Analysts; it will give you the opportunity to share ideas with qualified experts and to listen to some of the EPV customers experiences. The most interesting features provided by the latest versions of all EPV products will also be presented. The EPV User Group is free of charge and reserved to EPV customers. If you are not a customer yet but you are interested in participating, please answer to this e-mail asking for an invitation. Mark these dates in your agenda to avoid missing this event. More details in next newsletters. 3) Tech Notes - New CPENABLE recommendations “The enablement of z/OS logical processors as being marked as enabled for I/O interrupts has changed for the IBM Z Systems z14 and later processors… IBM recommends a CPENABLE = (5,15) setting for all z/OS LPARs running on z14 and later processors.” More details at: http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/FLASH10337 May 2020 - Number 05 1) Tech Papers-Is my IBM z15 performing as expected? - Part 3 Every time a new IBM machine is announced the LSPR benchmarks are published. They provide an indication of the performance of the new machine compared to the existing ones. Based on these numbers, on the usage of available tools, such as IBM zPCR, and on their capacity planning methodology, customers decide the characteristics of the new machine model which better fit their application needs for the next years. Once the upgrade has been completed some customers are happy, some are not satisfied, others simply are not able to understand if they get the expected performance benefits. We regularly receive requests from some customers to help them evaluate the new machine’s performance. This has also happened when upgrading to z15. Their question is always the same: “Is my new machine performing as expected?”. In this paper we will try to provide suggestions to help you answer this question. All these suggestions are not specific for an upgrade to z15, they also apply to any machine upgrade. In the final part we will also discuss a real case of migrating from z13 to z15. If you want to receive the paper you can reply to this e-mail writing "Is my IBM z15 performing as expected? - Part 1" in the subject 2) Tech Notes-Vector Packed Decimal Facility This very interesting article has been published more than 2 years ago. It refers to z14 but it is even more valuable with z15. If you missed it and you still run an old COBOL version, you absolutely need to read it. “ … some impressive performance numbers: A COBOL V6.2 program compiled with ARCH(12) in a 100 million times in a loop is 4.85x faster than COBOL V4 with 80 percent less CPU usage. It was 2.91x faster than a program compiled with ARCH(11) In a Zoned Decimal Computation, a program compiled using ARCH(12) is 3.05x faster than COBOL V4. Programs compiled with ARCH(12) are 1.74x faster than those compiled with ARCH(11). “ Read it at: https://ibmsystemsmag.com/IBM-Z/01/2018/vector-facility-z14 3) Tech Support - Important Db2 corrections PH17336: ENHANCEMENT IN IRLM DEADLOCK PROCESSING TO REDUCE CPU TIME This apar is an enhancement to reduce CPU consumed by IRLM deadlock processing. It is known that IRLM SRB time increases when there are a large amount of datasets opened concurrently due to the long hash chain to traverse. This apar makes enhancements in algorithm to reduce CPU used by IRLM. More details at: https://www.ibm.com/support/pages/apar/PH17336 PH23216: S MODE PAGE P-LOCKS NOT RELEASED WITH PGSTEAL(NONE) BUFFER POOLS S mode page P-locks associated with page sets that reside in Db2 12 PGSTEAL(NONE) contiguous buffer pools are not released. S mode page plocks are not that common. However, starting at FL500, a process running ISO(CS) CD(N) doing a TS scan of an object with many overflow rows could acquire a lot of these page plocks. If that object resides in a contiguous BP, the p-locks will not be released. This can result in high IRLM CPU usage (managing the extra locks including deadlock detection processing), increased IRLM latch contention and elongated transaction response times. More details at: https://www.ibm.com/support/pages/node/6112204 April 2020 - Number 04 1) Tech Papers-Is my IBM z15 performing as expected? - Part 2 Every time a new IBM machine is announced the LSPR benchmarks are published. They provide an indication of the performance of the new machine compared to the existing ones. Based on these numbers, on the usage of available tools, such as IBM zPCR, and on their capacity planning methodology, customers decide the characteristics of the new machine model which better fit their application needs for the next years. Once the upgrade has been completed some customers are happy, some are not satisfied, others simply are not able to understand if they get the expected performance benefits. We regularly receive requests from some customers to help them evaluate the new machine’s performance. This has also happened when upgrading to z15. Their question is always the same: “Is my new machine performing as expected?”. In this paper we will try to provide suggestions to help you answer this question. All these suggestions are not specific for an upgrade to z15, they also apply to any machine upgrade. In the final part we will also discuss a real case of migrating from z13 to z15. If you want to receive the paper you can reply to this e-mail writing "Is my IBM z15 performing as expected? - Part 1" in the subject 2) Tech Events - IBM z15 Model T02 announcement “IBM Z servers are designed to help enable cloud-native development and deployment, achieve encryption everywhere, and provide cyber resiliency to protect against the impact of cyber-attacks by ensuring isolation of workloads at scale, by protecting against insider and external threats, and ensuring continuous service by mitigating the impacts of downtime. All of these together can help to provide the cloud you want with the privacy and security you need. The IBM z15 (z15) Model T02 is the newest entry model into the IBM Z family of servers. It delivers an air cooled single-frame efficient design with a lower cost of entry that can easily coexist with other platforms in a cloud data center. The z15 can help protect data and help simplify compliance efforts.” Announcement available at: IBM z15 Model T02 announcement 3) Tech Notes - IBM z15 Model T02 MIPS tables New EPV MIPS tables including IBM z15 model T02 machines are already available. Full support of these new machines will be added to all V14 and V15 EPV products in the next weeks. EPV customers who want to receive the new tables in advance can get them by simply sending an email to EPV support. 4) Tech Support - IBM z15 Technical Introduction – Redbook This IBM Redbooks publication introduces the latest member of the IBM Z platform, the IBM z15. It includes information about the Z environment and how it helps integrate data and transactions more securely. It also provides insight for faster and more accurate business decisions. The z15 is a state-of-the-art data and transaction system that delivers advanced capabilities, which are vital to any digital transformation. The z15 is designed for enhanced modularity, and occupies an industry-standard footprint. It is offered as a single air-cooled 19-inch frame called the z15 T02, or as a multi-frame (1 to 4 19- inch frames) called the z15 T01. Download it here March 2020 - Number 03 1) Tech Papers-Is my IBM z15 performing as expected? - Part 1 Every time a new IBM machine is announced the LSPR benchmarks are published.
Load more

Recommended publications
  • MVS Planning: Workload Management
    z/OS Version 2 Release 3 MVS Planning: Workload Management IBM SC34-2662-30 Note Before using this information and the product it supports, read the information in “Notices” on page 235. This edition applies to Version 2 Release 3 of z/OS (5650-ZOS) and to all subsequent releases and modifications until otherwise indicated in new editions. Last updated: 2019-06-24 © Copyright International Business Machines Corporation 1994, 2019. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Figures................................................................................................................. xi Tables..................................................................................................................xv About this information....................................................................................... xvii Who should use this information..............................................................................................................xvii Where to find more information............................................................................................................... xvii Other referenced documents.................................................................................................................. xviii Information updates on the web...............................................................................................................xix How to send your comments to IBM.....................................................................xxi
    [Show full text]
  • DB2 V8 Exploitation of IBM Ziip
    Systems & Technology Group Connecting the Dots: LPARs, HiperDispatch, zIIPs and zAAPs Share in Boston,v August 2010 Glenn Anderson IBM Technical Training [email protected] © 2010 IBM Corporation What I hope to cover...... What are dispatchable units of work on z/OS Understanding Enclave SRBs How WLM manages dispatchable units of work The role of HiperDispatch What makes work eligible for zIIP and zAAP specialty engines Dispatching work to zIIP and zAAP engines z/OS Dispatchable Units There are different types of Dispatchable Units (DU's) in z/OS Preemptible Task (TCB) Non Preemptible Service Request (SRB) Preemptible Enclave Service Request (enclave SRB) Independent Dependent Workdependent z/OS Dispatching Work Enclave Services: A Dispatching Unit Standard dispatching dispatchable units (DUs) are the TCB and the SRB TCB runs at dispatching priority of address space and is pre-emptible SRB runs at supervisory priority and is non-pre-emptible Advanced dispatching units Enclave Anchor for an address space-independent transaction managed by WLM Can comprise multiple DUs (TCBs and Enclave SRBs) executing across multiple address spaces Enclave SRB Created and executed like an ordinary SRB but runs with Enclave dispatching priority and is pre-emptible Enclave Services enable a workload manager to create and control enclaves Enclave Characteristics Created by an address space (the "owner") SYS1 AS1 AS2 AS3 One address space can own many enclaves One enclave can include multiple Enclave dispatchable units (SRBs/tasks) executing concurrently in
    [Show full text]
  • Z/OS Intelligent Resource Director
    Front cover z/OS Intelligent Resource Director WLM LPAR CPU Management Dynamic Channel-path Management Channel Subsystem I/O Priority Queueing Frank Kyne Michael Ferguson Tom Russell Alvaro Salla Ken Trowell ibm.com/redbooks International Technical Support Organization z/OS Intelligent Resource Director August 2001 SG24-5952-00 Take Note! Before using this information and the product it supports, be sure to read the general information in “Special notices” on page 401. First Edition (August 2001) This edition applies to Version 1 Release 1 of z/OS, Program Number 5694-A01. Note: This book is based on a pre-GA version of a product and may not apply when the product becomes generally available. We recommend that you consult the product documentation or follow-on versions of this redbook for more current information. Comments may be addressed to: IBM Corporation, International Technical Support Organization Dept. HYJ Mail Station P099 2455 South Road Poughkeepsie, NY 12601-5400 When you send information to IBM, you grant IBM a non-exclusive right to use or distribute the information in any way it believes appropriate without incurring any obligation to you. © Copyright International Business Machines Corporation 2001. All rights reserved. Note to U.S Government Users – Documentation related to restricted rights – Use, duplication or disclosure is subject to restrictions set forth in GSA ADP Schedule Contract with IBM Corp. Contents Preface . .ix The team that wrote this redbook. .ix Special notice . .xi IBM trademarks . xii Comments welcome. xii Part 1. Introduction to Intelligent Resource Director . 1 Chapter 1. Introduction to Intelligent Resource Director (IRD).
    [Show full text]
  • IBM System Z10 Business Class - the Smart Choice for Your Business
    IBM United States Hardware Announcement 108-754, dated October 21, 2008 IBM System z10 Business Class - The smart choice for your business. z can do IT better Table of contents 4 Key prerequisites 36 Publications 4 Planned availability dates 38 Services 5 Description 38 Technical information 35 Product positioning 55 IBM Electronic Services 36 Statement of general direction 55 Terms and conditions 36 Product number 57 Pricing 36 Education support 57 Order now 58 Corrections At a glance The IBM® System z10 BC is a world-class enterprise server built on the inherent strengths of the IBM System z® platform. It is designed to deliver new technologies and virtualization that provide improvements in price/performance for key new workloads. The System z10 BC further extends System z leadership in key capabilities with the delivery of granular growth options, business-class consolidation, improved security and availability to reduce risk, and just-in-time capacity deployment helping to respond to changing business requirements. Whether you want to deploy new applications quickly, grow your business without growing IT costs, or consolidate your infrastructure for reduced complexity, look no further - z Can Do IT. The System z10 BC delivers: • The IBM z10 Enterprise Quad Core processor chip running at 3.5 GHz, designed to help improve CPU intensive workloads. • A single model E10 offering increased granularity and scalability with 130 available capacity settings. • Up to a 5-way general purpose processor and up to 5 additional Specialty Engine processors or up to a 10-way IFL or ICF server for increased levels of performance and scalability to help enable new business growth.
    [Show full text]
  • IDUG EU 2009 Patric Becker: Leveraging Data Warehouse
    Session: A01 Leveraging Data Warehouse Performance with DB2 9 for z/OS and System z10 Patric Becker IBM Boeblingen Lab 05 October 2009 • 11:30 – 12:30 Platform: DB2 for z/OS This session looks into new feature delivered with IBM System z10 as well as the new capabilities of DB2 9 for z/OS and highlights those options which can be beneficial for Data Warehousing environments in terms of availability and performance. Not all the relevant features can be described at a very granular level, but the idea is to provide information to understand the important features to trigger further analysis to improve the availability and performance of existing Data Warehouses. IBM Deutschland Research & Development GmbH IBM D Research & Development Headquarter IBM Deutschland Research & Development GmbH Schönaicher Straße 220 D-71032 Böblingen Berlin Managing Director Erich Baier Employees 2008 Approx. 1.800 (2.200) Homepage ibm.com/de/entwicklung Very strong development portfolio Mainz Globally integrated in hardware and software Walldorf development One of the biggest IBM R&D location world wide IBM Forschung & Böblingen Acknowledged innovation team Entwicklung ~ 310 patent submissions 2008 München ~ 400 students 2008 IND GmbH ~ 80 new-hires 2007 2 IBM Research & Development Locations worldwide Böblingen Greenock ▲ Yorktown Heights Toronto Hursley ▲ Peking Rochester Krakau Boulder Dublin Moskau Beaverton Paris Fujisawa ▲ Zürich ▲ Tokio Burlington Rom Yasu Yamato Endicott San Jose Shanghai ▲ Almaden East Fishkill Santa Teresa Poughkeepsie
    [Show full text]
  • Basic of Mainframe
    Basic of Mainframe Mainframe computer Mainframe is a very large and expensive computer capable of supporting hundreds, or even thousands, of users simultaneously. In the hierarchy that starts with a simple microprocessor at the bottom and moves to supercomputers at the top, mainframes are just below supercomputers. In some ways, mainframes are more powerful than supercomputers because they support more simultaneous programs. But supercomputers can execute a single program faster than a mainframe. The distinction between small mainframes and minicomputers is vague, depending really on how the manufacturer wants to market its machines. Modern mainframe computers have abilities not so much defined by their single task computational speed (usually defined as MIPS ² Millions of Instructions Per Second) as by their redundant internal engineering and resulting high reliability and security, extensive input- output facilities, strict backward compatibility with older software, and high utilization rates to support massive throughput. These machines often run for years without interruption, with repairs and hardware upgrades taking place during normal operation. Software upgrades are only non-disruptive when Parallel Sysplex is in place, with true workload sharing, so one system can take over another's application, while it is being refreshed. More recently, there are several IBM mainframe installations that have delivered over a decade of continuous business service as of 2007, with hardware upgrades not interrupting service. Mainframes are defined by high availability, one of the main reasons for their longevity, because they are typically used in applications where downtime would be costly or catastrophic. The term Reliability, Availability and Serviceability (RAS) is a defining characteristic of mainframe computers.
    [Show full text]
  • 1. Types of Computers Contents
    1. Types of Computers Contents 1 Classes of computers 1 1.1 Classes by size ............................................. 1 1.1.1 Microcomputers (personal computers) ............................ 1 1.1.2 Minicomputers (midrange computers) ............................ 1 1.1.3 Mainframe computers ..................................... 1 1.1.4 Supercomputers ........................................ 1 1.2 Classes by function .......................................... 2 1.2.1 Servers ............................................ 2 1.2.2 Workstations ......................................... 2 1.2.3 Information appliances .................................... 2 1.2.4 Embedded computers ..................................... 2 1.3 See also ................................................ 2 1.4 References .............................................. 2 1.5 External links ............................................. 2 2 List of computer size categories 3 2.1 Supercomputers ............................................ 3 2.2 Mainframe computers ........................................ 3 2.3 Minicomputers ............................................ 3 2.4 Microcomputers ........................................... 3 2.5 Mobile computers ........................................... 3 2.6 Others ................................................. 4 2.7 Distinctive marks ........................................... 4 2.8 Categories ............................................... 4 2.9 See also ................................................ 4 2.10 References
    [Show full text]
  • IBM System Z10 Capacity on Demand
    Front cover IBM System z10 Capacity on Demand Describes the concepts and structure of Capacity on Demand Explains the offerings and how they can be applied Provides step-by-step examples Marian Gasparovic Greg Chambers Ivan Dobos Per Fremstad Torsten Gutenberger Damian Ortega Lumbreras Rolf Mueller Karl-Erik Stenfors Yi Li Zhou ibm.com/redbooks International Technical Support Organization IBM System z10 Capacity on Demand January 2009 SG24-7504-01 Note: Before using this information and the product it supports, read the information in “Notices” on page vii. Second Edition (January 2009) This edition applies to the IBM System z10 servers. © Copyright International Business Machines Corporation 2008, 2009. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . vii Trademarks . viii Preface . ix The team that wrote this book . ix Become a published author . xi Comments welcome. xi Chapter 1. Overview . 1 1.1 System upgrades . 2 1.2 Capacity on Demand on the System z10 . 3 1.3 Provisioning architecture. 7 1.4 z/OS Capacity Provisioning. 11 1.5 Terminology . 14 Chapter 2. Understanding the Capacity on Demand environment . 17 2.1 Capacity on Demand upgrades. 18 2.1.1 On-line Permanent Upgrade . 20 2.1.2 Capacity Backup . 20 2.1.3 Capacity for Planned Events. 26 2.1.4 On/Off Capacity on Demand. 27 2.2 Multiple activations . 35 2.2.1 Multiple active temporary offerings . 35 2.2.2 Permanent upgrade with temporary offerings active. 39 2.2.3 Subcapacity activation .
    [Show full text]
  • IBM System Z10 Enterprise Class Configuration Setup July 2008
    Front cover IBM System z10 Enterprise Class Configuration Setup Plan I/O configuration for new processor or upgrade Configure I/O environment, STP, cryptographic adapters Step-by-step configuration definition examples Franck Injey Peter Hoyle Masaya Nakagawa Frank Packheiser Karan Singh ibm.com/redbooks International Technical Support Organization IBM System z10 Enterprise Class Configuration Setup July 2008 SG24-7571-00 Note: Before using this information and the product it supports, read the information in “Notices” on page vii. First Edition (July 2008) This edition applies to the System z10 Enterprise Class server. © Copyright International Business Machines Corporation 2008. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Notices . vii Trademarks . viii Preface . ix The team that wrote this book . ix Become a published author . .x Comments welcome. .x Chapter 1. Channel Subsystem overview . 1 1.1 Channel Subsystem . 2 1.2 Logical partitions . 4 1.3 Subchannel sets . 5 1.4 Channels . 7 1.5 The definition for Multiple CSS . 15 1.6 Activation. 17 Chapter 2. Configuration planning . 19 2.1 Tools . 20 2.1.1 IBM Configurator for e-business (e-Config) . 21 2.1.2 Resource Link . 21 2.1.3 Hardware Configuration Definition (HCD). 21 2.1.4 Hardware Configuration Manager (HCM) . 22 2.1.5 Input/Output Configuration Program . 23 2.1.6 CHPID Mapping Tool . 24 2.2 Hardware Management Console (HMC). 26 2.2.1 Hardware Management Console Application V2.10.0 . 30 2.2.2 Remote Support Facility (RSF) .
    [Show full text]
  • Z10 EC System Overview Level 06B, February 2011
    System z10 Enterprise Class System Overview SA22-1084-06 Level 06b, February 2011 System z10 Enterprise Class System Overview SA22-1084-06 Level 06b, February 2011 Level 06b, February 2011 Note Before using this information and the product it supports, read the information in “Safety” on page xi, Appendix D, “Notices,” on page 151, and IBM Systems Environmental Notices and User Guide, Z125-5823. | This edition, SA22-1084-06, applies to the IBM System z10 Enterprise Class (z10 EC) server. This edition replaces | SA22-1084-05. Technical changes to the text are indicated by a vertical bar (|) to the left of the change. There might be a newer version of this document in a PDF file available on Resource Link.Goto http://www.ibm.com/servers/resourcelink and click Library on the navigation bar. A newer version is indicated by a lowercase, alphabetic letter following the form number suffix (for example: 00a, 00b, 01a, 01b). © Copyright IBM Corporation 2008, 2011. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Level 06b, February 2011 Contents Figures ..............vii Power sequence controller .........31 Additional features/functions supported ....31 Tables ...............ix Monitoring and estimating CPC power consumption and temperature .......31 Preplanning and setting up the Storage Area Safety ...............xi Network (SAN) environment .......32 Safety notices ..............xi World trade safety information .......xi Chapter 3. Software support .....33 Laser safety information ..........xi z/OS ................34 Laser compliance ...........xi z/VM ................35 z/VSE ................35 About this publication ........xiii Linux on System z ............36 What is included in this publication ......xiii TPF.................36 Revisions ..............xiii Prerequisite publications..........xiii Chapter 4.
    [Show full text]
  • Classification of Computers
    Classification of Computers Computer systems used for business purposes can be divided in to three classes: Microcomputers, Minicomputers and Mainframe computers. Though these divisions are loosely based on the size of the computer systems, there are no hard and fast rules for deciding exactly where one category ends and the next begin. Hence the largest minicomputer systems are often larger than the smallest mainframe computers. The “size” of a computer system is dependent on the size of a computer’s hardware configuration, the nature of its applications, and the complexity of its system software. This helps us to classify a system as a microcomputer, minicomputer or mainframe. Irrespective of size, all computers consist of two basic types of components. Those are processors and input/output (I/O) devices. The processor consists of three parts: the Central Processing Unit, or CPU, main storage and device controllers. The CPU executes instructions, main storage stores instructions and data processed by the CPU and device controllers let the CPU and main storage connect to I/O devices. Note: Though all computer systems consist of three basic components, the way those components are combined for a particular computer system varies depending on the system’s requirements. Microcomputer or Personal Computer Microcomputer is primarily intended for stand-alone use by an individual. Microcomputers are small, single-user systems which provide a simple processor and just a few input/output devices. This system consists of a processor with 2 or 4 GB of main storage, a keyboard, a display monitor, a printer, and a diskette drive with a capacity of 4GB and a 500 GB of hard disk.
    [Show full text]
  • High Availability and Scalability of Mainframe Environments Using System Z and Z/OS As Example
    robert vaupel _ of mainframe environments high availability and scalability of mainframe environments r. vaupel Robert Vaupel High Availability and Scalability of Mainframe Environments using System z and z/OS as example High Availability and Scalability of Mainframe Environments using System z and z/OS as example by Robert Vaupel Impressum Karlsruher Institut für Technologie (KIT) KIT Scientific Publishing Straße am Forum 2 D-76131 Karlsruhe www.ksp.kit.edu KIT – Universität des Landes Baden-Württemberg und nationales Forschungszentrum in der Helmholtz-Gemeinschaft Diese Veröffentlichung ist im Internet unter folgender Creative Commons-Lizenz publiziert: http://creativecommons.org/licenses/by-nc-nd/3.0/de/ KIT Scientific Publishing 2013 Print on Demand ISBN 978-3-7315-0022-3 Contents 1. Introduction 1 1.1. Motivation . 1 1.2. High Availability . 3 1.3. Scalability . 5 2. z/Architecture 9 2.1. A Little History . 9 2.2. System z CMOS Heritage . 12 2.3. System zEC12 Central Electronic Complex . 13 2.4. System zEC12 Components . 14 2.5. System z Multi Chip Module . 16 2.5.1. Memory . 17 2.5.2. Book . 18 2.5.3. Processor Characterization . 18 2.6. System z High Availability Design . 19 2.6.1. Transparent CPU Sparing . 20 2.6.2. CPU Error Detection for newer System z machines . 21 2.6.3. Redundant Array of Independent Memory . 22 2.7. System z Software and Firmware Layers . 25 2.8. Instruction Execution . 27 2.8.1. CISC versus RISC Architecture . 27 2.8.2. Register Sets . 30 2.8.3. Program Status Word . 31 2.8.4.
    [Show full text]