Generalized trace facility (GTF) trace data for open/close/end-of-volume (O/C/EOV) can be collected during DFSMShsm processing for DASD and tape media.

Perform the following steps to collect GTF data during O/C/EOV processing for DFSMShsm.

1. Start the GTF with MODE=EXTERNAL, TRACE=USR.
2. To collect DFSMShsm tape-oriented O/C/EOV records, perform the following DFSMShsm PATCH command:

   PATCH .MCVT.+F2 X'00' /* allow tracing of tape O/C/EOV */

3. To collect DFSMShsm DASD-oriented O/C/EOV records, perform the following DFSMShsm PATCH command:

   PATCH .MCVT.+F3 X'00' /* allow tracing of DASD O/C/EOV */

4. Initiate the DFSMShsm function that you want to trace.
5. When the DFSMShsm tracing is complete, apply the following DFSMShsm PATCH command:

   PATCH .MCVT.+F2 X'FFFF' /* ensure the traces are turned off */

6. Stop the GTF and review the trace output.