To monitor performance and operation of the NFS server built into macOS, you can access detailed usage statistics and review the current status of clients. Select the item NFS Server > Statistics in the left overview column of the control window, or select the menu item Configuration > Show Server Statistics.
The tab item Operations shows a table with counter entries. The NFS requests the server has processed since its last start are listed in lines containing the word Calls. Errors which occurred and the behavior of the cache can be monitored through the remaining entries. The cache entries use the following abbreviations:
The tab item Shares collects statistical data per share. For each share, the number of operations and the number of read and written bytes is shown.
The tab item Users gives an overview which users are currently connected to the NFS server, which shares they are using, from which clients they are accessing, and since what time no requests have been sent (inactive). The number of operations and the number of read and written bytes is shown as well. Two check-mark controls allow you to define whether you prefer the numeric display of client addresses and user identifications.