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). . . . . . . . . . 3 1.1 S/390 - A history lesson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 1.2 Why Intelligent Resource Director is the next step . . . . . . . . . . . . . . . .8 Part 2. WLM LPAR CPU Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Chapter 2. Introduction to WLM LPAR CPU Management. . . . . . . . . . . . . 15 2.1 What WLM LPAR CPU Management is . . . . . . . . . . . . . . . . . . . . . . . 16 2.2 Workload Manager advantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.3 Workload Manager highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.4 LPAR concepts I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.5 LPAR concepts II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.6 Options prior to WLM LPAR CPU Management . . . . . . . . . . . . . . . . . 26 2.7 Problems with existing CPU management options . . . . . . . . . . . . . . . 28 2.8 Prerequisites for WLM CPU Management . . . . . . . . . . . . . . . . . . . . . 30 2.9 WLM LPAR Weight Management I . . . . . . . . . . . . . . . . . . . . . . . . . . .32 2.10 WLM LPAR Weight Management II . . . . . . . . . . . . . . . . . . . . . . . . . 33 2.11 WLM LPAR Weight Management III . . . . . . . . . . . . . . . . . . . . . . . . . 35 2.12 WLM Vary CPU Management. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 2.13 Value of WLM LPAR CPU Management . . . . . . . . . . . . . . . . . . . . . .38 2.14 When do you need WLM LPAR CPU Management?. . . . . . . . . . . . . 39 2.15 Relationship to IBM License Manager . . . . . . . . . . . . . . . . . . . . . . . 42 2.16 New terminology for WLM LPAR CPU Management. . . . . . . . . . . . . 44 Chapter 3. How WLM LPAR CPU Management works . . . . . . . . . . . . . . . . 47 3.1 Shared logical CPs example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 3.2 LPAR dispatching and shared CPs. . . . . . . . . . . . . . . . . . . . . . . . . . .52 3.3 Reasons for intercepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 3.4 LPAR event-driven dispatching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 3.5 LPAR weights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 3.6 LPAR capping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 © Copyright IBM Corp. 2001 iii ... - tailieumienphi.vn