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nfsstat – List NFS client and server status

The nfsstat command is used to display the statistics of the NFS (Network File System) server and client. It provides information about the NFS client and server status, including the number of RPC (Remote Procedure Call) requests, the number of failed requests, and the number of bytes transmitted.

Overview

The nfsstat command displays the following information:

  • The number of bytes read/written by the NFS client and server
  • The number of RPC requests sent and received by the NFS client and server
  • The number of failed RPC requests
  • The number of times the NFS client and server have retransmitted requests
  • The number of times the NFS client and server have timed out waiting for a response

Examples

To display the NFS client and server statistics, simply run the nfsstat command:

nfsstat

This will display the following output:

Server rpc stats:
calls      badcalls   badclnt    badauth    xdrcall
0          0          0          0          0       

Server nfs v3:
null         getattr      setattr      lookup       access       readlink     
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 

Server nfs v4:
null         compound     
0         0% 0         0% 

Client rpc stats:
calls      retrans    authrefrsh
0          0          0       

Client nfs v3:
null         getattr      setattr      lookup       access       readlink     
0         0% 0         0% 0         0% 0         0% 0         0% 0         0% 

Client nfs v4:
null         compound     open         close        setattr      fsinfo       
0         0% 0         0% 0         0% 0         0% 0         0% 0         0%

This output shows the statistics for both the NFS server and client. The Server rpc stats section shows the number of RPC calls, bad calls, bad clients, bad authentication attempts, and XDR calls. The Server nfs v3 and Server nfs v4 sections show the number of NFS version 3 and 4 calls for each type of operation.

The Client rpc stats section shows the number of RPC calls, retransmissions, and authentication refreshes for the NFS client. The Client nfs v3 and Client nfs v4 sections show the number of NFS version 3 and 4 calls for each type of operation.

Options

The following table lists the available options for the nfsstat command:

Option Description
-c Continuously display the NFS statistics.
-o Display the NFS statistics in an optimized format.
-s Display the NFS statistics for a specific interval of time.

Troubleshooting Tips

If you are experiencing issues with NFS, the nfsstat command can be useful in identifying the problem. Here are some tips for troubleshooting common issues:

  • If you see a high number of retransmissions in the Client rpc stats section, it may indicate network congestion or a slow server. Try increasing the rsize and wsize mount options to improve performance.
  • If you see a high number of failed RPC requests in the Server rpc stats section, it may indicate a problem with the NFS server. Check the server logs for errors or try restarting the NFS service.
  • If you see a high number of timed-out requests in the Server rpc stats section, it may indicate that the NFS server is overloaded. Try reducing the number of NFS clients or increasing the server resources.

Notes

  • The nfsstat command is available on most Linux distributions and is typically included in the nfs-utils package.
  • The output of the nfsstat command can be difficult to interpret, especially for users who are not familiar with NFS. It is recommended to consult the NFS documentation or seek assistance from a qualified Linux administrator if you are unsure about the meaning of the statistics.

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