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What is the maximum number of trunked connections for NFS in ONTAP 9?

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFS

Answer

  • There is a limit of 16 connections under any circumstances, either limited by the client or by ONTAP due to the following parameters:
  • The number of data LIFs on the ONTAP node that are bound into an failover group for session trunking
  • The max_connect number choose on the client side

Example:

  • With 8 data LIFs per node in a session trunking failover group, clients could get connections until this number is reached automatically.
  • If the client is using max_connect=4 and ONTAP has 8 data LIFs, then only 4 sessions will be established, because the client is limiting it.
     
  • NetApp's recommendation is to set the client mount parameter always to max_connect=16 and let the number of possible connections be managed by the definition of a session trunking groups number of DataLIFs.

Note:

  • In the above example, the client would get 8 connections only, even if it is set to 16.
  • The number of mounting volumes doesn't influence outside of large client scale environments with high workloads consisting of parallel reads and writes from all clients.

Additional Information

NFS trunking overview

 

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