The exports data set specified in the exports DD statement of the MVSNFS startup procedure is read during server startup processing. Changes to this file do not take effect for new mount points until the exportfs operand of the modify command is completed or the server is restarted. The changes will also be immediately enforced at z/OS NFS server startup or exportfs operand time regardless of the state of any pre-existing mount points. For exportfs operand with 'symresolve' attribute effects for the showmount command, see Using commands on the z/OS NFS client. Note that any pre-existing mount points continue to exist even if they have been removed from the exports data set. However, any security changes apply immediately.

When the exportfs operand of the modify command is issued, any errors found in the file are sent to the system log, the entire exports list is not refreshed, and processing continues.

When the server is started, if any errors are found in the file, they are sent to the system log, and the server stops once the entire exports data set has been read.