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High latency after ONTAP upgrade with CX5 Ethernet ports

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Applies to

  • ONTAP 9
  • Dual 40G/100G Ethernet Controller CX5

Issue

  • After upgrading from ONTAP 9.12.1P2 to 9.12.1P15, high latency is seen on multiple FlexGroup and FlexVol volumes.
  • Most of the latency is determined to occur at the cluster interconnect layer.
  • High counts of CRC errors are seen on a cluster port of one of the nodes in the cluster.

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