Skip to main content
NetApp Knowledge Base

What is the performance impact on NAS when using FPolicy in Data ONTAP 7-mode?

Last Updated:

Applies to

  • Data ONTAP 8.2 7-Mode


  • FPolicy will cause CIFS and NFS work to be serialized (not spread across multiple processor cores). Look specifically at elevated Kahuna domain utilization with FPolicy enabled.
  • In Data ONTAP 7-mode NFS traffic will be impacted more than CIFS traffic, since there's no equivalent of first_read and first_write filter
     for NFS. This means that instead of just the first read operation being scanned, all packets for that read are scanned. (See Bug# 858682)
  • See TR 3640 for ways to mitigate impact from overloaded FPolicy servers.
    Latencies and requests can be seen in Perfstat or via the CLI:
    • Data ONTAP 7-Mode:
      • > priv set diag
      • *>stats perfstat_fpolicy_stats_server (look for avg_latency and make sure there is a non-zero 'base')

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.