19.4. WebSphere MQSeries z/OS channel trace
It is worth noting that a wrap-around line trace is always active for each channel and the trace data is stored in a 4K buffer (one for each channel) in the CHIN address space.
This is a good source of data for reviewing problems with LU6.2 and TCP/IP channels.
To enable the trace data to be reviewed, you must have a CSQSNAP DD statement in your CHIN JCL. To display the trace data (to write it to the data set specified in the CSQSNAP DD, for example SYSOUT=*), you must start a CHIN trace as follows:
START TRACE(GLOBAL) RMID(231) CLASS(4) IFCID(202) DISPLAY CHSTATUS(channel) CURRENT
In this example, (channel) is the channel that you need to trace.
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