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High read latency on guest VM

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • NFS
  • VMWare ESXi

Issue

  • Linux Guest VM is experiencing high read latencies
 
  • nfsiostat shows difference between avg RTT (ms) and avg exe (ms) times
                               ops/s       rpc bklog
42.084           0.000
 
read:              ops/s            kB/s           kB/op         retrans    avg RTT (ms)    avg exe (ms)
6.474        5621.697         868.353        0 (0.0%)         122.872         331.764
write:             ops/s            kB/s           kB/op         retrans    avg RTT (ms)    avg exe (ms)
33.986       19821.226         583.223        0 (0.0%)          40.425         260.674

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