The NSM protocol defines six RPC procedures which implement the network status manager. With the integration of NSM into the NFS server address space, procedures 0 through 5 act as null procedures and return no results if invoked externally. Procedure 6, however, is fully implemented. The procedures are as follows:

Procedure 0: do nothing

Procedure 0 (NULL) does nothing

Procedure 1: SM_STAT

Dummy call, always return STAT_FAIL

Procedure 2: SM_MON

Monitor a client host

Procedure 3: SM_UNMON

Unmonitor a client host

Procedure 4: SM_UNMON_ALL

Unmonitor all client hosts

Procedure 5: SM_SIMU_CRASH

Simulate a crash

Procedure 6: SM_NOTIFY

NFS server notifies clients that server is restarting, so clients need to reclaim any locks they previously had on server files. This procedure is fully implemented by the z/OS NFS server.