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Why does the throughput of NIC exceed the theoretical value in System Manager

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ontap-9
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Applies to

  • ONTAP 9
  • Two 40G ports form an LACP

Answer

  • The throughput limit of two 40G ports is 10GB/s, Because each 40G port is theoretically limited to 5GB/s
  • The reported throughput for this LIF is higher than 12GB/s

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This is the expected behavior:

  • In Full-Duplex mode, Sender can send the data and also can receive the data simultaneously. It is two-way directional communication simultaneously.

  • This throughput reported from System Manager is the sum of In and Out, In and Out can each reach 10GB/s In full-duplex, So the theoretical limit is 20GB/s

Additional Information

  • See the description of full-duplex bandwidth
  • The throughput of LIF seen In AIQ PAS Node View is also the sum of In and Out

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