IBM Z Performance and Capacity Analytics Version 3 Release 1 System Performance Feature Guide IBM SC28-3225-00 Note Before using this information and the product it supports, read the information in “Notices” on page 149. This edition applies to version 3, release 1 of IBM Z Performance and Capacity Analytics (program number 5698-AS3) and to all subsequent releases and modifications until otherwise indicated in new editions. Last updated: August 2020 © Copyright International Business Machines Corporation 1994, 2017. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. © Teracloud S.A. 2018, 2020. Contents Figures................................................................................................................ vii Tables................................................................................................................ xiii Preface................................................................................................................xv Who should read this book.........................................................................................................................xv What this book contains............................................................................................................................. xv Publications............................................................................................................................................... xvi Accessing publications online............................................................................................................. xvi Accessibility............................................................................................................................................... xvi Support information.................................................................................................................................. xvi Conventions used in this book.................................................................................................................. xvi Typeface conventions......................................................................................................................... xvii Changes in this edition............................................................................................................................. xvii Chapter 1. Introducing the System Performance Feature........................................1 System Performance Feature components.................................................................................................1 Chapter 2. Developing a performance and service-level strategy.............................5 Defining service-level objectives.................................................................................................................6 Specifying terms for objectives..............................................................................................................7 Documenting the workload.................................................................................................................... 7 Measuring resource consumption....................................................................................................... 10 Setting objectives................................................................................................................................. 10 Gathering performance data..................................................................................................................... 11 z/OS Workload Management.....................................................................................................................11 Displaying and creating reports.................................................................................................................12 Analyzing reports....................................................................................................................................... 12 Identifying potential bottlenecks..............................................................................................................12 Analyzing detailed data............................................................................................................................. 12 Deciding where to get more resources..................................................................................................... 13 Verifying removal of performance constraints..........................................................................................13 Continuing the process..............................................................................................................................13 Chapter 3. Analyzing z/OS performance............................................................... 15 Using RMF and SMF data........................................................................................................................... 16 Analyzing overall performance..................................................................................................................16 Analyzing performance at the system level........................................................................................ 17 Analyzing performance at the workload level..................................................................................... 18 Workload Manager............................................................................................................................... 20 Analyzing processor resources................................................................................................................. 21 Measuring processor time....................................................................................................................21 Analyzing processor usage.................................................................................................................. 24 Analyzing latent demand..................................................................................................................... 25 Analyzing who is using the processor..................................................................................................26 Analyzing LPAR and PR/SM processor use..........................................................................................27 Analyzing processor storage resources.................................................................................................... 30 Measuring processor storage activity..................................................................................................31 Analyzing page movement...................................................................................................................32 iii Analyzing who is using processor storage...........................................................................................34 Analyzing data in memory....................................................................................................................37 Analyzing processor storage configuration......................................................................................... 39 Analyzing I/O resources............................................................................................................................ 42 Measuring I/O.......................................................................................................................................42 Analyzing the data................................................................................................................................44 Analyzing enqueue contention.................................................................................................................. 56 Measuring the data...............................................................................................................................56 Analyzing the data................................................................................................................................56 Chapter 4. Analyzing DFSMS storage management data....................................... 59 Measuring storage usage...........................................................................................................................59 Managing storage usage............................................................................................................................ 60 Managing storage usage trends...........................................................................................................60 Isolating storage problems..................................................................................................................62 Managing free capacity and storage group thresholds....................................................................... 65 Using migration threshold reporting....................................................................................................66 Managing backup and migration storage.................................................................................................. 68 Managing migration..............................................................................................................................69 Managing backup data sets................................................................................................................. 70 Managing exceptions................................................................................................................................