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NetApp Knowledge Base

Latency increases suddenly while using QoS

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1,002
Visibility:
Public
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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • Clustered ONTAP 8.2 and 8.3
  • ONTAP 9
  • 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)

 

 

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