- Clustered Data ONTAP 8
- Data ONTAP 7 and earlier
The default CIFS TCP window size on the controller is 17520 bytes, but can be increased to 8387700 bytes. To view the current setting, run the following command:
Filer> options cifs.tcp_window_size
For more information on how to force the Windows 2000/XP client to use larger window sizes, refer to CIFS TCP Window size is limited to 64240 bytes.
Note: CIFS should be terminated and restarted for the option
cifs.tcp_window_size to take effect. The TCP window size is only set when CIFS registers with the network code. That happens when CIFS starts or when a new name is registered as a NetBIOS alias. If you are not restarting CIFS, only the newly registered names will have the changed window size. When registering a NetBIOS alias, CIFS looks at the controller's registry key
options.cifsinternal.aliaswindowsize to get the value to use. This value is updated whenever a NetBIOS alias is created and it uses the then-current value of
cifs.tcp_window_size. This registry value is maintained separately from the current value of
For additional information, refer the performance section of your respective Data ONTAP System Administrator's Guide.
- What is the default, minimum, maximum, and recommended value for cifs.tcp_window_size in Data ONTAP 7-Mode?
Note: In clustered Data ONTAP, the maximum TCP window receive size has been pre-set to 7631441 bytes.