Hi Barry
the option you are looking for is:
cifs.weekly_W2K_password_change
This will tell the NetApp Controller to change the computer account password once per week, around 01:00 AM Sundays.
If you have many DC's in your Forrest, this can result in a short pause on the clients CIFS connection, with a maximum of 1 minute.
Hope this answers your question.
Peter