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Write Performance Impacted by Back to Back Consistency Points

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ontap-9
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perf
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Applies to

  • ONTAP 9
  • FAS 
  • AFF

Issue

  • A FlexVol or FlexGroup is experiencing increased / higher than expected write latency which can also be obersved in the unified manager tool
  • Latency is reported as Data or Disk or WAFL Susp CP latency from qos statistics or AIQ
  • Latency reported coincides exactly with WRITE workload increase
  • sysstat -x output shows evidence of CP type CP_Ty B (Back-to-Back) CPs

Non-AFF controllers more susceptible to this issue

 

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