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Can we improve Wafliron performance?

Last Updated:

Applies to

  • ONTAP 9
  • Wafliron


WARNING: Manually increasing the WAFL scan speed value to a high value can cause a significant performance impact to data production.  Only change it with the direction of NetApp Technical Support.

WAFL scan speed:

  • Controlled by the nodeshell command wafl scan speed
  • By default, is automatically tuned by ONTAP based on available system resources. 
  • Affects the CPU time allocated for file system scanning.
  • Higher values will negatively impact performance.
  • Does not impact Phase 1 mounting time.


Changing WAFL scan speed

  1. Check current speed if desired:

::> set advanced
::*> run local wafl scan speed       
WAFL scan speed is 1300

  1. Set speed to 2000 and monitor:

::> set advanced
::*> run local wafl scan speed 2000  
::*> run local wafl scan speed
WAFL scan speed is 2000

  1. If further increases are needed, do so in increments of 5%.   
  2. When Wafliron has completed, reset scan speed to automatic tuning:

::> set advanced
::*> run local wafl scan speed 0    
::*> run local wafl scan speed
WAFL scan speed is 1300

Additional Information



NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.


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