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Latency increases suddenly while using QoS - Resolution Guide

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ontap-9
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perf
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Applies to

  • ONTAP 9
  • Quality of Service (QoS)
  • NAS protocols - NFS and CIFS
  • SAN protocols - FCP and iSCSI

Issue

  • When using a QoS policy, QoS latency will suddenly increase
  • Network Exempt utilization - CPU processing for protocol ops - will increase.
  • Users may report intermittent slowness/latency issue whenever QOS max limit is reached, due to the saturated Network Exempt processing domain. 
    • Delay from Cluster Interconnect
    • Delay from Network Processing, also called CPU N-Blade or Network Exempt (Nwk_Exmpt)
  • Performing any test (like running dd commands) on the client end report high latency due to bursty workload in nature. 

 

 

 

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