English FUJITSU Software BS2000 Performance Handbook User Guide Valid for: SE Servers BS2000 OSD V11.0B X2000 V6.3 February 2020 Comments… Suggestions… Corrections… The User Documentation Department would like to know your opinion on this manual. Your feedback helps us to optimize our documentation to suit your individual needs. Feel free to send us your comments by e-mail to: [email protected]. Certified documentation according to DIN EN ISO 9001:2015 To ensure a consistently high quality standard and user-friendliness, this documentation was created to meet the regulations of a quality management system which complies with the requirements of the standard DIN EN ISO 9001:2015. Copyright and Trademarks Copyright © 2020 Fujitsu Technology Solutions GmbH. All rights reserved. Delivery subject to availability; right of technical modifications reserved. All hardware and software names used are trademarks of their respective manufacturers. EMC2®, Symmetrix®, Symmetrix DMX™, VMAX®, VMAX3™, SRDF® are trademarks of DELL EMC Corporation, Hopkinton/MA (USA). Quantum®, the Quantum logo and Scalar® are trademarks of Quantum Corporation, San Jose (USA). Table of Contents Performance Handbook . 10 1 Preface . 11 1.1 Objectives and target groups of this manual . 12 1.2 Summary of contents . 13 1.3 Changes since the last edition of the manual . 14 1.4 Notational conventions . 15 2 Characteristic performance values . 16 2.1 Characteristic performance values of an online application . 2.2 Characteristic performance values of a batch application . 20 2.3 Formulating a performance expectation . 21 2.4 Relative performance factor of the CPU (RPF) . 25 2.4.1 Multiprocessor systems . 26 2.4.2 Special features for x86 servers . 27 2.5 Characteristic main memory values . 28 2.5.1 Special features for x86 servers . 29 2.6 Characteristic peripheral values . 30 2.6.1 Time slices for I/Os to disk . 31 2.6.2 Hardware service time . 33 2.6.3 Software service time . 34 3 Objects relevant to performance . 36 3.1 Storage systems . 37 3.1.1 Connection to the server . 38 3.1.1.1 Connection of storage systems to /390 servers . 40 3.1.1.2 Connection of storage systems to x86 servers . 41 3.1.2 Properties of storage systems . 42 3.1.2.1 Components of the storage systems . 43 3.1.2.2 Replication: volume-based mirroring for storage systems . 45 3.1.2.3 Thin Provisioning . 46 3.1.3 Load types . 47 3.1.4 Cache behavior with different load types . 48 3.1.5 RAID configuration . 50 3.1.5.1 RAID groups LUNs, and volumes . 51 3.1.5.2 RAID levels and their performance . 52 3.2 Disk organization and accesses from the BS2000 viewpoint . 54 3.2.1 Logical volumes . 55 3.2.2 Pubsets . 57 3.2.2.1 Use of SF pubsets . 58 3.2.2.2 Use of SM pubsets . 59 3.2.3 Access methods . 62 3.2.3.1 UPAM and BTAM . 63 3.2.3.2 FASTPAM . 64 3.2.3.3 SAM . 65 3.2.3.4 ISAM . 66 3.2.3.5 PAM . 67 3.2.3.6 Databases . 68 3.2.3.7 DIV . 69 3.2.4 Processing mode . 70 3.2.4.1 OPEN . 71 3.2.4.2 Accesses . 72 3.2.4.3 CLOSE . 73 3.3 Network connection . 74 3.4 Net-Storage . 75 3.5 Virtual machines . 76 3.5.1 VM2000 scheduling (/390 servers) . 77 3.5.2 VM groups on /390 servers . 80 3.5.3 CPU pools . 81 3.5.4 Main memory . 83 3.5.5 Peripherals . 84 4 System-internal processes which are relevant to performance . 87 4.1 CPU states . 88 4.2 User tasks and system tasks . 91 4.3 Task management . 92 4.3.1 Introduction to task management . 94 4.3.1.1 Activating/deactivating tasks . 95 4.3.1.2 Initiation/deinitiation of tasks . 103 4.3.1.3 Controlling tasks via queues . 105 4.3.2 Prior concept . 108 4.3.2.1 Task categories . 109 4.3.2.2 Task priorities . 111 4.3.2.3 Load analysis . 113 4.3.2.4 Setting the category parameters . 116 4.3.2.5 Assigning priorities . 122 4.3.2.6 I/O priority handling for tasks using IORM . 124 4.3.3 PCS concept . 125 4.3.3.1 Category-specific control parameters . 126 4.3.3.2 Global system control parameters . 128 4.3.3.3 Procedure when using PCS . ..