Note: This a bug in the OnTap 7.37P3 Version.
RequireSecuritySignature is not required to be On or 00000001 in OnTap 8.1.2 7-Mode
With the above on, you cut your speed in 1/2 when writing to the Netapp.
Because Version 7 is no longer supported, Netapp has no desire to fix it. If you are still using the older Filers, namely the FAS2020's, you'll see this problem.
Having said that, Netapp is still the best!!!!!!!!!!!