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High latency or reduced throughput seen when using NFS4.1 with krb5p security

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • NFS 4.1
  • krb5p authentication Mode.

Issue

  • High latency or reduced throughput is reported when using NFS4.1 with krb5p security.
  • The latency  is higher as compared to what is seen for NFS4.1+ krb5 security.
  • READ workload seems to have more degraded performance as compare to writes.
  • Most of the latency is seen to be driven out of CPU_NBlade.

cluster::*> qos statistics volume latency show
Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -    16.46ms    16.41ms        0ms    49.00us        0ms        0ms        0ms
vol1-wi..        12345    16.55ms    16.50ms        0ms    49.00us        0ms        0ms        0ms
vol1-wi..        12345    16.37ms    16.32ms        0ms    48.00us        0ms        0ms        0ms
-total-              -    16.52ms    16.47ms        0ms    49.00us        0ms        0ms        0ms
vol1-wi..        12345    16.57ms    16.52ms        0ms    49.00us        0ms        0ms        0ms
vol1-wi..        12345    16.46ms    16.41ms        0ms    49.00us        0ms        0ms        0ms

 

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