Skip to main content
NetApp Knowledge Base

What is the performance impact when enabling SMB Signing?

Last Updated:


Applies to

  • ONTAP 9
  • SMB
  • SMB Signing


  • When SMB sessions use SMB signing, all SMB communications to and from Windows clients experience a performance impact, which affects both the clients and the server (that is, the nodes on the cluster running the SVM containing the SMB server)
  • The performance impact shows as increased CPU usage on both the clients and the server, although the amount of network traffic does not change

Additional Information

  • SMB signing may interfere with some solutions that by design (for example, WAN accelerators) act as a man in the middle and modify SMB network traffic
  • Performance impact of SMB signing
  • If the performance impact is too large, consider enabling SMB 3 encryption instead for AES-NI enabled storage systems starting in ONTAP 9.7.
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.
Scan to view the article on your device