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Why Does NetApp Harvest Report High Usage Times for WAFL Cleaning?

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Applies to

  • ONTAP 9
  • NetApp Harvest 
  • Clustered Data Ontap (CDOT)

Answer

  • The NetApp Harvest performance monitoring tool may report high system utilization for "WAFL Write Cleaning":

wafl_write_cleaning

  • "WAFL Write Cleaning" is NetApp Harvest's terminology for the time the controller spent processing Consistency Points (CP)
  • Consistency Points have several phases; WAFL Write Cleaning refers to a specific phase of the consistency point where metadata is gathered from disk
  • The presence of high system utilization due to WAFL Write Cleaning is not indicative of a performance problem; it is a completely normal performance state

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