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Slowness on NFS clients with little or no latency from ONTAP

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • High latency or a sudden drop in throughput during peak load on NFS clients would be observed.
  • Oracle DB reports high wait time on DB commits.
  • It cannot be attributed to a CPU/Memory/Disk bottleneck on the storage controllers via CLI or monitoring tools.
  • From ONTAP 9.8, Event Log error messages similar to the following:
Fri Jan 01 01:47:19 +0100 [NETAPP03: kernel: nblade.execsOverLimit:error]: The number of in-flight requests from client 
with source IP 10.20.30.40 to destination LIF 10.20.30.50 (Vserver 7) is greater than the maximum number of in-flight 
requests allowed (128). The client might see degraded performance due to request throttling.

 

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