Front cover I/O Configuration Using z/OS HCD and HCM Understand the I/O configuration process, concepts, and terminology Use HCD and HCM to define and manage hardware configurations Review configuration examples of IOCP data sets Karan Singh Preben Esbensen Peter Hoyle Mark Pope Jean Sylvester ibm.com/redbooks International Technical Support Organization I/O Configuration Using z/OS HCD and HCM April 2010 SG24-7804-00 Note: Before using this information and the product it supports, read the information in “Notices” on page ix. First Edition (April 2010) This edition applies to Version 1, Release 11 of z/OS (product number 5694-A01). © Copyright International Business Machines Corporation 2010. 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 . ix Trademarks . .x Preface . xi The team who wrote this book . xi Now you can become a published author, too! . xiii Comments welcome. xiii Stay connected to IBM Redbooks . xiii Part 1. Concepts . 1 Chapter 1. Introduction. 3 1.1 I/O configuration . 4 1.1.1 Who performs the I/O configuration . 4 1.1.2 I/O configuration flow . 4 1.2 Hardware Configuration Definition (HCD) and benefits. 6 1.3 Hardware Configuration Manager (HCM) and benefits. 7 1.4 I/O configuration: POR, IPL, dynamic reconfiguration . 8 1.4.1 Power-on reset (POR). 9 1.4.2 Initial program load (IPL). 9 1.4.3 Dynamic reconfiguration . 9 1.5 Hardware Management Console and Support Element . 10 Chapter 2. System z concepts . 11 2.1 System z10 dedicated hardware storage area (HSA). 12 2.2 System z channel subsystem (CSS). 12 2.2.1 Multiple channel subsystems . 14 2.2.2 Multiple subchannel sets. 14 2.3 Hardware Management Console and Support Element . 15 2.4 IOCP, IOCDS, ICPIOCP, stand-alone IOCP and IODF . 17 2.5 IRD, WLM, and DCM . 19 2.5.1 Intelligent Resource Director (IRD) . 19 2.5.2 Workload Manager (WLM) . 19 2.5.3 Dynamic Channel Path Management (DCM) . 20 2.6 Sysplex Timer: ETR and STP . 27 Chapter 3. Software details . 29 3.1 Hardware Configuration Definition (HCD) . 30 3.1.1 Reporting . 30 3.1.2 Installation. 30 3.1.3 I/O definition file (IODF) . 30 3.1.4 Terminology . 31 3.1.5 Documentation . 32 3.2 Hardware Configuration Manager (HCM) . 32 3.2.1 Reporting . 32 3.2.2 Installation. 32 3.3 CHPID Mapping Tool (CMT) . 33 3.3.1 Installation. 33 3.4 Base Control Program internal interface (BCPii). 34 © Copyright IBM Corp. 2010. All rights reserved. iii 3.4.1 BCPii address space. 34 3.4.2 BCPii installation steps . 34 3.4.3 Functions performed using BCPii APIs. 35 3.4.4 Enhancements at z/OS 1.11 . 35 Chapter 4. z/OS I/O supervisor . 37 4.1 The workflow of an I/O operation . 38 4.2 Unit control block (UCB) . 39 4.3 Channel subsystem. 40 4.3.1 Start Subchannel (SSCH) logic. 40 4.3.2 SAP logic . 41 4.3.3 Interrupt processing . 41 4.4 Channel types and CHPID . 41 4.5 Directors (switches). 42 4.6 Control units . 43 4.7 Device number . 44 4.8 Subchannel number . 44 4.9 Paths . 45 Part 2. Configuration . 47 Chapter 5. I/O configuration process . 49 5.1 Initiation: Requesting a change. 50 5.1.1 New order . 50 5.1.2 IBM configurator for e-business (e-Config) . 50 5.1.3 CCN for retrieving the CFReport. 50 5.1.4 Resource Link . 51 5.1.5 CFReport . ..