Entering operands of the modify command for diagnosis

These operands of the modify command can help you to collect data for diagnosing problems.
Note: All operands must be preceded with either: 
MODIFY mvsnfs,

or

F mvsnfs,

where

mvsnfs
Specifies the name of the procedure in your system PROCLIB used to start up the server.

Each message is sent to the console, the component trace, or the data set that is pointed to by the NFSLOG1 or NFSLOG2 DD statements, or a combination of those destinations.