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NFS latency spikes due to overloaded network context

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Category:
ontap-9
Specialty:
Perf
Last Updated:

Applies to

  • ONTAP 9
  • Network File System (NFS)

Issue

  • Severe NFS read latency spikes (>20ms) observed on volume
  • Application crashes during latency events impacting critical financial applications
  • The following EMS message is seen, and high utilization is seen on a network context:
Wed Oct 07 22:20:16 +0200 [cluster01: kernel: net_cg_utilThresholdExceed_1:notice]: params: {'connection_group': '9', 'current_utilization': '96', 'configured_threshold': '95'}
Wed Oct 07 23:20:18 +0200 [cluster01: kernel: net_cg_utilThresholdExceed_1:notice]: params: {'connection_group': '9', 'current_utilization': '96', 'configured_threshold': '95'}
  • a heavy traffic seen for all sessions:
  • ~2.8 GB CIFS and ~9.28GB NFS sent to NetApp
  • ~4.5 GB CIFS and ~8.02GB NFS received by NetApp

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