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Does ONTAP have a single counter manager to track all the CIFS SMB versions used by the NAS clients

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Applies to

  • All FAS/AFF systems connected to CIFS clients  which supports all versions of SMB.

Answer

  • Currently there is no way to track the SMB  client versions using counter manager statistics.
  • The following (diag) commands can be used to track respective SMB version connections from the CIFS object. 
    • Although these counts are not accurate for SMB version 1. 
::*> statistics show-periodic -object cifs:vserver -counter smb3_connections_count -instance <vserver_name>
::*> statistics show-periodic -object cifs:vserver -counter smb2_1_connections_count -instance <vserver_name>
::*> statistics show-periodic -object cifs:vserver -counter smb2_connections_count -instance <vserver_name>
::*> statistics show-periodic -object cifs:vserver -counter smb1_connections_count -instance <vserver_name>
  • The SMB protocol negotiates protocol-specific options using the SMB_COM_NEGOTIATE request and response messages.
    • The client will send its supported version and options to the CIFS server. '
    • The server will respond with the highest commonly supported version.   
  • This SMB_COM_NEGOTIATE is counted as a connection count for SMB1 , whereas the client might have actually negotiated and connected via a higher dialect.
    • Hence , there is a discrepancy in those values with the actual SMB1 connection count.
    • No further enhancements are done for SMB1 counter manager as Microsoft has announced that it is deprecating SMB 1 and will be disabling it, by default, in a future version of Windows Server.
  • The only way to track clients still using SMB 1 is by referencing the following counter, which tracks the (SMB_COM_NEGOTIATE) from any client which supports SMB1.
::*> statistics show-periodic -object smb1 -counter established_sessions -instance <vserver_name>
  • However, this counter is only available for SMB1.
    • All other SMB versions SMB(2/2.1/3) are aggregated under SMB2.
    • There is no current mechanism to track established sessions for SMB2 ,SMB2.1 and SMB3 separately.

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