JCLCM0165S Open for joblog "filename" failed. Also see JCLCM0166

Use the extended file status code for more information on this failure.

Extended file status codes are of the form:

9/nnn

where nnn is a numeric value that is corresponds to a run-time system error. For example, if an extended file status code of 9/029 is returned, run-time system error COBRT029 (Attempt to delete open file) provides more information about the cause.