Verify that the writer is active

If an external writer is being used, the operator should verify that the writer is active for the trace by entering one of the following DISPLAY TRACE commands on the console with MVS™ master authority. The first command requests writer status for all current component traces; the second command requests it for one writer by specifying the membername of the source JCL for the writer, such as WTDASD2. The response is in message IEE843I.

display trace,wtr=all
IEE843I ...

display trace,wtr=wtdasd2
IEE843I ...

The operator should verify that the source JCL for the writer in this display is the same as the source JCL for the writer that was started for the trace. If the membernames do not match, the component trace data is lost. The operator should stop the writer job identified in the display and the component trace; then start the correct writer source JCL and start the trace again.