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Chapter 4. FLEX-ES Operation 33
4.2.2 Linux TN3270
A TN3270 emulator is included with Linux. In our opinion, it is not quite the same quality as
the x3270 emulator distributed with FLEX-ES or the PCOM emulator we used on OS/2 and
Windows machines.
4.2.3 IODF requirements
OS/390 requires an IODF data set that defines the I/O configuration seen by the software.
This normally matches the IOCDS defined for the S/390 I/O hardware configuration. The
ThinkPad/EFS platform does not have an IOCDS. All resources are defined in FLEX-ES
system and resource files, compiled with the FLEX-ES resource compiler cfcomp, and then
activated by the FLEX-ES resource manager resadm command.
An IODF is still required within an OS/390 system, but the HCD input to generate it does not
need to define control unit details. That is, a simple device definition (device number, type,
optional features) is all that is required. OS/390 dynamic I/O redefinition capability is not
available.
In response to a d ios,config(all) command, we received the following:
- 11.38.06 d ios,config(all)
11.38.06 IOS506I 11.38.06 I/O CONFIG DATA 656
ACTIVE IODF DATA SET = SYS1.IODF01
CONFIGURATION ID = CBIPO EDT ID = 00
HARDWARE SYSTEM AREA DATA COULD NOT BE OBTAINED
ELIGIBLE DEVICE TABLE LATCH COUNTS
0 OUTSTANDING BINDS ON PRIMARY EDT
You can, however, perform software dynamic configuration changes via OS/390 Hardware
Configuration Definition (HCD) dialogs or the OS/390 ACTIVATE command, provided the
affected devices are included in the FLEX-ES definition files.
4.2.4 System performance monitors
Because I/O sub-channel blocks are not maintained by FLEX-ES software emulation, the
OS/390 Resource Measurement Facility (RMF) is not fully supported. You can run RMF, or
other system performance monitors, but some of the reporting (especially when it comes to
I/O activity) will not be complete.
When we started RMF, it reported the absence of an IOCDS in this environment and
automatically terminated I/O queuing activity reporting:
- 11.22.34 s rmf
- 11.22.35 STC00439 $HASP373 RMF STARTED
11.22.36 STC00439 ERB100I RMF: ACTIVE
11.22.36 STC00439 ERB265I RMF: IOCDS INFORMATION UNAVAILABLE TO RMF.
RESPONSE CODE 01F0
11.22.37 STC00439 ERB260I ZZ : I/O QUEUING ACTIVITY RMF REPORT TERMINATED
11.22.38 STC00439 ERB100I ZZ : ACTIVE
SYS1.LOGREC may not have hardware error information. Consequently, any report
produced by Environmental Recording and Editing Program (EREP) will have limited value
when it comes to hardware detected errors. Due to time constraints, we did not investigate
this area in more detail.