IBM s/390 manual Flex-Es, Brief introduction

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3.1 FLEX-ES

This redbook concentrates on the use of FLEX-ES with a ThinkPad running Linux. Furthermore, we describe a particular ThinkPad/EFS configuration used as a starting point for IBM’s S/390 Partners in Development (PID) organization. This configuration might be regarded as the minimum practical system for using OS/390 and z/OS.

The following descriptions and figures assume this particular ThinkPad/EFS configuration. Other configurations and more complex systems are possible, but are not described here.

3.1.1 Brief introduction

Conceptually, FLEX-ES can be viewed as the following components:

A S/390 instruction emulator, which might be seen as the heart of the system. It examines each S/390 operation code and emulates that operation, using the instructions of its underlying PC processor.

A resource manager that controls the interfaces between the emulated S/390 processors and emulated I/O devices and connections.

Emulators for various S/390 I/O devices.

A FLEX-ES console for controlling FLEX-ES startup and operation. (This is not related to the OS/390 master console.)

A Terminal Solicitor program that emulates local, channel-attached, non-SNA 3270 terminals. The actual terminals are TN3270 sessions that connect to this program through normal TCP/IP protocols.

A number of utility programs to help set up and run the FLEX-ES environment.

Figure 3-1provides a simplified view of FLEX-ES operation. FLEX-ES is simply a process1 under Linux. While this illustration should not be taken too literally, it can be used to make a number of basic points about FLEX-ES.

1It is actually a number of interrelated processes and threads, but that can be ignored at the conceptual level.

16S/390 PID: ThinkPad Enabled for S/390

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Contents ThinkPad Enabled for S/390 Bill OgdenPage International Technical Support Organization First Edition October Contents Shutting down Index Vi S/390 PID ThinkPad Enabled for S/390 Special notice AuthorIBM trademarks Comments welcomeIntroduction Purpose of this redbook ThinkPad/EFS systemsFLEX-ES Linux Positioning with other small S/390sThinkPad/EFS hardware used Terminology System and Linux installation Disk planningDifferences Partition Manually Partition Linux installationThinkPad Mount Point Device Requested Actual Type Purpose255.255.255.0 Device Partition Type Default Boot12.17.210 12.17.150Gnome Select Start X automatically Installation notesMonitor Setup IBM 9513 T55A TFT No clock chip 24 bit # df -h# kill -s USR1 pidnumber PID number for xinetd Etc/xinetd.d # vi telnet# ps -ef grep xinetd 14 S/390 PID ThinkPad Enabled for S/390 FLEX-ES and OS/390 installation FLEX-ES Brief introductionPC Processor in ThinkPad Page Installation Installing the FLEX-ES license key AD systems OS/390 AD systemsNext steps # mkdir /s3912 OS/390 on CD-ROM Basic CD-ROM formats3 OS/390 device configuration FLEX-ES formatsAn unzip program Installation tasksUnzipping and installing Awsckd CD-ROM files Mount /dev/cdrom /mnt/cdromMinor problems File ownershipVolume in two separate zip files Files unzip in wrong orderFLEX-ES Operation FLEX-ES system and resource definitions Comments# resadm -s R10A.rescf Building a shell script$ cd /usr/flexes/rundir $ resadm -r$ sh shos Flexes ipl a80 0a82cs =stor IPL OS/390Terminal Solicitor 11.42.47 Operation and useUser terminal connection A80,8System performance monitors Linux TN3270Iodf requirements Rmf5 TCP/IP for OS/390 # resadm -k Shutting down# resadm -T # exit36 S/390 PID ThinkPad Enabled for S/390 Additional Topics Basic debugging Server memory Operating Systems Messages consoleSecurity Vmstat command Importance of Linux swapping CPU# cat /proc/partitions Using a second Linux hard diskUltrabay Second disk planning Device Volser Addr Use Disk layout AD systemPartition Mount Size Use FLEX-ES FakeTape on OS/390 Alternative method560 222222Multi-system setup $ x3270 -model 3 -keymap pc -port tn3270 localhostt91f X3270 client$ x3270 -model 3 -keymap pc -port tn3270 localhost Function Keys Used# vi # cd /usr/lib/X11/app-defaults # cp X3270 X3270oldRemote resources Disk caches System BWrites Cache Hits Tuning cachesize FSI Channel AdaptersDisk fragmentation Backup and restore considerationsScsi adapter for the ThinkPad Using tar to back up S/390 volumes $ tar -cvzf /holding/OS39RA.tarz /s390/OS39RAUsing tar and ftp $ cd /usr/flexes/rundir $ sh buOS39RAc16 S/390 identification CD-RW driveDisplay PSW and registers RAS discussionVerify ckd disk Linux windowsInstalling FLEX-ES upgrades ThinkPad power controlUseful Linux commands Common commandsMultiple consoles, sessions, screens Text editors62 S/390 PID ThinkPad Enabled for S/390 Frequently asked questions 64 S/390 PID ThinkPad Enabled for S/390 Frequently asked questions 66 S/390 PID ThinkPad Enabled for S/390 Frequently asked questions 68 S/390 PID ThinkPad Enabled for S/390 Appendix A. FLEX-ES definition listings Basic definitions for a single HDDShell script for a single HDD Definitions for two HDDs Shell script for two HDDs Appendix B. FLEX-ES parameters System definitionsCpu0 Cpu1 Cpu2 Resource definitions Emulated control unit typesEmulated device types Typical resource definitionsCKD disk resources Terminal resources Tape resources LAN resourcesCloned devices Resadm command Common rulesCLI commands 560 Home/tape3 Flexes mount A90 S390/WORK01710 Altcons 84 S/390 PID ThinkPad Enabled for S/390 Special notices 86 S/390 PID ThinkPad Enabled for S/390 Referenced Web sites How to get IBM RedbooksIBM Redbooks Other resourcesIBM Redbooks collections Index Pipe Port Power control Terminal logo Terminal Solicitor 16, 18, 31, 39, 65 92 S/390 PID ThinkPad Enabled for S/390 Partners in Development ThinkPad Enabled for S/390 Page Page ThinkPad Enabled for S/390 System setup AD CD-ROM use System operation