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High number of TX discards on all switch side node ports in MetroCluster IP

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Applies to

  • ONTAP 9
  • 8-node MetroCluster IP
  • Cisco 9336 back-end switches

Issue

  • During a planned stress test in one of the DR groups, high number of TX discards are reported on MetroCluster switch ports for the other DR group
  • Nodes in the DR group where the test is made report TX pause frames and no_buffer discards  due to high amount of traffic being received (ifstat output)
  • Cisco event logs showing buffer exhaustion messages - show logging log: 

%TAHUSD-SLOT2-4-BUFFER_THRESHOLD_EXCEEDED: Module 2 Instance 0 Pool-group buffer 90 percent threshold is exceeded!

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