AHL911I

Explanation
The trace writer has detected an input/output error
during OPEN/CLOSE/EOV processing for a data set.
In the message
text: abc
The abend code.
return-code
The return code.
dsname
The name of the data set.

System action
Trace writer processing will continue as long
as there are additional trace data sets still available. If all trace
data sets are exhausted, then trace writer processing will end.

Operator response
Record the message and notify the system programmer.

System programmer response
Verify  that a valid trace data set
has been specified for use and restart GTF. If the problem recurs,
examine data set in error, or use alternative data set. The data set
in error  contain valid trace data; however, the results of post processing
this trace data are unpredictable.

Source
Generalized trace facility (GTF)

Module
AHLWINIT