The sample EDGUX100 exit module depends on the system mount messages containing data set name information. If you plan to use data set name based pooling, issue the z/OS MONITOR DSNAME command.

For testing purposes, issue this command at an operator terminal. However, for production implementation, ensure that the command is always issued by including it as a command in the COMMNDxx member of the parmlib. Any other method that results in the monitor option being active before any tape requests are issued is also acceptable.

When a non-specific volume request is received, use the exit module to determine the correct pool to be used.