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Do both UDP and TCP connections count towards the 100,000 connection limit per node?

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • TCP/UDP

Answer

  • Yes, both UDP and TCP traffic contributes to the 10,000 connection limit on lower end systems with less memory and 100,000 (+10% internal connections) on higher end systems with more memory,
    • UDP is considered stateless, but ONTAP holds an internal "connection-id" open for 2 minutes in case another call comes in on the same ip/port combination
    • UDP CIDs have a lifecycle of at least 4 seconds, but no more than 60 seconds, if idle
    • When 95% of 100K connection limit is breached, ONTAP begins deleting the Least Recently Used (LRU) UDP CID
    • If new connections outpace the deletion rate, new UDP and TCP connections may see intermittent un-responsiveness

Additional Information

 

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