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Chapter 6. Frequently asked questions 65
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