IBM s/390 manual Linux TN3270, IODF requirements, System performance monitors

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)

11.38.06IOS506I 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

11.22.36STC00439 ERB265I RMF: IOCDS INFORMATION UNAVAILABLE TO RMF.

RESPONSE CODE 01F0

11.22.37STC00439 ERB260I ZZ : I/O QUEUING ACTIVITY RMF REPORT TERMINATED

11.22.38STC00439 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.

Chapter 4. FLEX-ES Operation 33