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Linux for IBM System Z9 and Zseries

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Linux for IBM System Z9 and Zseries Front cover Linux for IBM System z9 and IBM zSeries Running Linux on IBM System z9 and IBM zSeries Using and configuring the Linux 2.6 kernel Virtualizing with z/VM Gregory Geiselhart Robert Brenneman Eli Dow Klaus Egeler Torsten Gutenberger Bruce Hayden Livio Sousa ibm.com/redbooks International Technical Support Organization Linux for IBM System z9 and IBM zSeries January 2006 SG24-6694-00 Note: Before using this information and the product it supports, read the information in “Notices” on page vii. First Edition (January 2006) This edition applies to Version 5, Release 1 of z/VM and multiple distributions of Linux for zSeries based on the 2.6 Linux kernel. © Copyright International Business Machines Corporation 2006. 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 redbook. ix Become a published author . x Comments welcome. xi Chapter 1. Introduction to z/Architecture . 1 1.1 The zSeries and System z9 servers . 2 1.2 The central processing complex . 2 1.2.1 Processing units . 2 1.3 The channel subsystem . 2 1.4 Logical partition concepts . 4 1.4.1 LPAR dispatching . 4 Chapter 2. Linux 2.6 kernel. 9 2.1 Choosing a 64-bit or 31-bit Linux distribution . 10 2.1.1 Linux 31-bit compatibility mode. 10 2.2 Performance and scalability enhancements . 11 2.2.1 The new Linux process scheduler. 12 2.2.2 System swap setting . 13 2.2.3 Kernel preemption. 13 2.2.4 Fast user-space mutual exclusion . 13 2.2.5 I/O performance and scalability enhancements . 14 2.2.6 I/O schedulers . 14 2.2.7 Extended attributes and access control lists . 16 2.2.8 Memory management enhancements. 17 2.2.9 Native POSIX Threading Library. 17 2.2.10 NFS version 4 . 19 2.3 Introduction to sysfs . 20 2.3.1 Organization of the /sys directory . 20 2.3.2 New sysfs command for Linux on zSeries . 22 2.3.3 Device configuration with sysfs . 24 2.3.4 SLES9 hardware configuration . 24 2.3.5 RHEL4 hardware configuration . 28 2.3.6 Device node naming with udev . 32 2.3.7 Hotplug detection and device node naming . 33 2.3.8 Distribution considerations when naming devices . 36 © Copyright IBM Corp. 2006. All rights reserved. iii 2.4 S/390 tools and utilities . 37 2.4.1 The cmsfslst command . 38 2.4.2 The tunedasd command . 38 2.4.3 The dasdview command . 39 Chapter 3. Virtualization with z/VM . 41 3.1 z/VM and virtualization . 42 3.1.1 z/VM guest support . 42 3.2 Installing z/VM 5.1 . 43 3.2.1 Installation to FCP-attached SCSI disk . 43 3.3 Distributions for Linux on zSeries . 47 3.3.1 SUSE Linux Enterprise Server 9. 47 3.3.2 Red Hat Enterprise Linux 4 . 47 3.3.3 Non-commercial distributions . 48 3.3.4 IBM middleware for Linux on zSeries . 48 3.4 Running Linux under z/VM . 49 3.4.1 Managing guest virtual memory . 49 3.4.2 Managing z/VM storage . 49 3.4.3 Managing the VM scheduler . 53 3.4.4 Performance monitoring . 56 Chapter 4. Networking Overview . 59 4.1 Networking options . 60 4.2 Physical networking options . 60 4.2.1 Open Systems Adapter-2 (OSA-2) . 60 4.2.2 Open Systems Adapter-Express (OSA-Express) . 60 4.2.3 Channel-to-channel adapter . 76 4.2.4 Common Link Access to Workstation (CLAW) . 82 4.3 HiperSockets . 83 4.4 Virtualization technology . 91 4.5 Point-to-point connectivity . 91 4.5.1 Guest LAN. 93 4.6 Guest LAN configuration . 96 4.6.1 Create a z/VM Guest LAN. 96 4.6.2 Persistent Guest LANs . 97 4.6.3 The VMLAN statement . 98 4.6.4 Create a virtual Network Interface Card . 100 4.6.5 NIC definition in the user directory . 100 4.6.6 NIC definition using CP commands . 102 4.6.7 Connect the virtual NIC to the Guest LAN . 103 4.6.8 Example of building a z/VM Guest LAN . 104 4.6.9 Undoing the definitions . 106 4.6.10 Configuring Linux to connect to a Guest LAN . 107 iv Linux for IBM System z9 and IBM zSeries 4.7 Virtual Switch. 108 4.8 Introduction to VLANs . 109 4.8.1 What is a Virtual LAN . 109 4.8.2 VLAN standards . 113 4.8.3 How IEEE 802.1Q VLANs work . 114 4.8.4 VLAN support on z/VM Guest LAN . 119 4.8.5 VLANs on z/VM Virtual Switch . 119 4.8.6 VLAN isolation. 120 4.9 VSWITCH configuration . 121 4.9.1 Transport mode: IP or Ethernet. 121 4.9.2 Configure controller service machines . 121 4.9.3 Defining a VSWITCH . 124 4.9.4 VSWITCH failover support . 126 4.10 Layer 2 test scenario . ..
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