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What is the default CIFS TCP window size?

  1. Last updated
    Jan 17, 2025
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Category:
data-ontap-8
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nas
Last Updated:
1/17/2025, 10:56:12 AM

Applies to

  • ONTAP 9
  • Data ONTAP 7-mode
  • TCP
  • CIFS

Answer

  • ONTAP 9
    • TCP window sizes are auto tuned in ONTAP 9 and increase based on demand.
    • To see the live value of the advertised windows size at any point in time for any connection on a node:

::> node run -node <nodename> netstat -p tcp

Note: The column Rwind will represent the advertised window for any connection

  • Data ONTAP 7-mode:
    • Default CIFS TCP window size on the controller is 17520 bytes, but can be increased to 8387700 bytes.

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