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Service Procedures
To display a trace, click on the P/390 110 Trace icon. The program behind the icon is AWSTRACE.EXE.
It displays and decodes the trace. The trace decode file is CHANTR.SCR.
To write the trace to disk, click on FILE from the 1/0 TRACE menu. The trace is written to
AWSTRACE.LST in the C:\P390 subdirectory. Copy and rename this file before doing another trace;
otherwise, the new file overlays it. The trace is written to disk in ASCII, and should be uploaded that way
(unlike the snap dumps, which are in binary, and should be uploaded in binary).
Using the Device Debug Facility
The Device Debug facility allows you to specify I/O trace options dynamically. This is useful if you want to
change either the devices to be traced or the stop options for a device.
To set up an I/O trace, click on Control from the P/390 MANUAL OPERATIONS menu bar. Then click
on DEVICE DEBUG and specify the address of the device you want to trace. Click the desired trace
options (at least check 'Trace I/O Operations") and "ENTER" to activate.
For large trace reqUirements activate the P/390 Trace Spooling (AWSTRSP.nnn) option. (SEE BELOW)
Kernel Trace
The kernel trace is a lower level trace that is not device specific. It traces low level interaction between
the P/390 and the channel. Because kernel trace is not device specific, it should not normally be used.
Once you've determined the area of the problem and have taken a few traces, it may be useful to take a
kernel trace to look for some refinement on the error, but often the useful data in the kernel trace is
overwhelmed by data from other devices.
To turn the kernel trace on or off, click on Control from the P/390 MANUAL OPERATIONS main menu.
If the kernel trace is currently ON, then the menu item reads STOP KERNEL TRACE indicating that if you
select it, the kernel trace is turned off. If the menu item reads START KERNAL TRACE, then when you
select it the kernel trace is turned on.
P/390 Trace Spooling (AWSTRSP.nnn)
This is the P/390 trace spooling facility. It consists of a device driver (AWSPOSDD.SYS) and a spooling
application (AWSTRCSP.EXE). It will write the P/390 trace data to a file as it is created, thereby allowing
a much greater "trace memory" than previously available.
Syntax
AWSTRCSP </S=nnnnnnnn>
</B=bbb>
</PL>
</PN>
</PH>
Optional Parameters
/S=nnnnnnnn
Limit output file to nnnnnnnn (decimal) 4K blocks. Two output files, AWSTRCSP.001
and AWSTRCSP.002 will be created, with maximum size of nnnnnnnn 4K blocks. In
absence of this parameter, a single file, AWSTRCSP.DMP, will be created which will
indefinitely grow in size.
Chapter 10. Service Procedures
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