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High Node and CPU Utilization Due to WAFL Scan

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • High Node and CPU Utilization is seen  due to wafl scan 
  • The below command and the utilization graph in graphana shows the below symptoms wiht wafl_scan taking up more CPU even when user workload is less from the client end
  • Screenshot 2025-09-02 225850.png
::> qos statistics workload resource cpu show -node node1
Workload           ID   CPU Wafl_exempt Kahuna Network Raid  Exempt Protocol
--------------- ----- ----- ----------- ------ ------- ----- ------ --------
-total- (1600%)     -  405%        187%     0%     89%    2%   116%       0%
_WAFL               7  132%         92%     0%      0%    0%    40%       0%
System-Default      1  102%          6%     0%     53%    1%    41%       0%
_WAFL_SCAN         20   79%         49%     0%      0%    0%    30%       0%

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