IBM s/390 manual Frequently asked questions

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that Server memory is better used as S/390 central storage than as S/390 expanded storage. However, you might have specific applications that require expanded storage, so we cannot provide an absolute answer. You face the same quandary when dividing up real memory on an MP3000, for example, between central storage, expanded storage, and a disk cache.

Q:Several ThinkPad processor speeds are available. The model you used for this redbook (750 Mhz) is one of the slowest. Can I use a faster processor?

A:Yes.

Q:Can I write FakeTape files from my UNIX and Linux applications?

A:Yes. The format is well documented. APIs are provided if you work under UnixWare and Linux.

Q:How many x3270 sessions or TN3270 sessions can I have on the ThinkPad display?

A:There is no particular limit. Reasonable screen usage might indicate a practical maximum of something like three or four.

Q:Should I use Terminal Solicitor sessions (via Linux TCP/IP) or OS/390 TCP/IP connections for my TSO and CICS users?

A:Assuming OS/390 TCP/IP is configured and working, it does not appear to make much difference. OS/390 TCP/IP connects TN3270 sessions to VTAM and whether VTAM is using a local, non-SNA 3270 (as emulated by the Terminal Solicitor) or working through OS/390 TCP/IP has no observable effect at the end-user level. Systems programmers will probably prefer to work through the Terminal Solicitor because it is operational even if OS/390 TCP/IP is not working.

Q:When I connect via OS/390 TCP/IP, I do not get the terminal logo I always receive if I connect via the Terminal Solicitor. Why not?

A:This is due to your OS/390 TCP/IP setup. The OS/390 TCP/IP PROFILE needs to point to a USSTAB module that generates the logo. Recent AD releases have this set up.

Q:Can I connect to OS/390 with an ASCII telnet session? I want to use vi.

A:Yes, although this is not really a ThinkPad/EFS question. Recent AD releases have port 1023 (of OS/390 TCP/IP) configured for ASCII telnet sessions. If you are not using an AD release, you will need to configure OS/390 TCP/IP.

Q:I have the impression there are frequent FLEX-ES releases. Do I receive these automatically? When should I upgrade? Where is there a concise list of what is new in each release?

A:In general, releases are obtained through the IBM business partner from which you purchased the system. You should upgrade only when a later release contains a feature you need. Information on what is new in each release can be obtained from your IBM business partner.

Q:I have the latest z/OS AD release. Can I run it on a ThinkPad/EFS?

A:Yes. The latest RELS-ES release (at the time of writing) supports z/OS in 31-bit mode.

Q:Where can I order a printed copy of the FLEX-ES manuals?

A:FLEX-ES manuals can be obtained from the IBM business partner from which you purchased the system.

Q:Can I use the ThinkPad for other purposes when FLEX-ES is not running? Can I run Linux server functions on it when FLEX-ES is running?

A:When FLEX-ES is not running, you can run anything you want on your Thinkpad—taking care not to disturb the FLEX-ES customization. When FLEX-ES is running, you could still run other Linux workload. However, we generally recommend against this. The external workload

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Contents Bill Ogden ThinkPad Enabled for S/390Page International Technical Support Organization First Edition October Contents Shutting down Index Vi S/390 PID ThinkPad Enabled for S/390 Author Special noticeComments welcome IBM trademarksIntroduction ThinkPad/EFS systems Purpose of this redbookFLEX-ES Positioning with other small S/390s LinuxThinkPad/EFS hardware used Terminology Disk planning System and Linux installationDifferences Mount Point Device Requested Actual Type Purpose Linux installationThinkPad Partition Manually Partition12.17.150 Device Partition Type Default Boot12.17.210 255.255.255.0Gnome # df -h Installation notesMonitor Setup IBM 9513 T55A TFT No clock chip 24 bit Select Start X automaticallyEtc/xinetd.d # vi telnet # ps -ef grep xinetd# kill -s USR1 pidnumber PID number for xinetd 14 S/390 PID ThinkPad Enabled for S/390 FLEX-ES and OS/390 installation Brief introduction FLEX-ESPC Processor in ThinkPad Page Installation Installing the FLEX-ES license key # mkdir /s391 OS/390 AD systemsNext steps AD systemsBasic CD-ROM formats 2 OS/390 on CD-ROMFLEX-ES formats 3 OS/390 device configurationMount /dev/cdrom /mnt/cdrom Installation tasksUnzipping and installing Awsckd CD-ROM files An unzip programFile ownership Minor problemsFiles unzip in wrong order Volume in two separate zip filesFLEX-ES Operation Comments FLEX-ES system and resource definitions$ resadm -r Building a shell script$ cd /usr/flexes/rundir # resadm -s R10A.rescf$ sh shos Flexes ipl a80 0a82cs IPL OS/390 Terminal Solicitor=stor A80,8 Operation and useUser terminal connection 11.42.47Rmf Linux TN3270Iodf requirements System performance monitors5 TCP/IP for OS/390 # exit Shutting down# resadm -T # resadm -k36 S/390 PID ThinkPad Enabled for S/390 Additional Topics Basic debugging Operating Systems Messages console SecurityServer memory Vmstat command CPU Importance of Linux swappingUsing a second Linux hard disk Ultrabay# cat /proc/partitions Second disk planning Disk layout AD system Partition Mount Size UseDevice Volser Addr Use Alternative method FLEX-ES FakeTape on OS/390222222 560Multi-system setup Function Keys Used X3270 client$ x3270 -model 3 -keymap pc -port tn3270 localhost $ x3270 -model 3 -keymap pc -port tn3270 localhostt91f# cd /usr/lib/X11/app-defaults # cp X3270 X3270old Remote resources# vi System B Disk cachesWrites Cache Hits FSI Channel Adapters Tuning cachesizeBackup and restore considerations Scsi adapter for the ThinkPadDisk fragmentation $ tar -cvzf /holding/OS39RA.tarz /s390/OS39RA Using tar to back up S/390 volumes$ cd /usr/flexes/rundir $ sh buOS39RAc Using tar and ftpCD-RW drive 16 S/390 identificationRAS discussion Display PSW and registersLinux windows Verify ckd diskThinkPad power control Installing FLEX-ES upgradesCommon commands Useful Linux commandsText editors Multiple consoles, sessions, screens62 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 Basic definitions for a single HDD Appendix A. FLEX-ES definition listingsShell script for a single HDD Definitions for two HDDs Shell script for two HDDs System definitions Appendix B. FLEX-ES parametersCpu0 Cpu1 Cpu2 Emulated control unit types Resource definitionsTypical resource definitions Emulated device typesCKD disk resources Terminal resources LAN resources Tape resourcesCloned devices Common rules Resadm commandCLI commands Flexes mount A90 S390/WORK01 710 Altcons560 Home/tape3 84 S/390 PID ThinkPad Enabled for S/390 Special notices 86 S/390 PID ThinkPad Enabled for S/390 Other resources How to get IBM RedbooksIBM Redbooks Referenced Web sitesIBM 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 System setup AD CD-ROM use System operation ThinkPad Enabled for S/390
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