After a month of troubleshooting and configuring, I have confirmed that Solarwinds SRM 6.6 does not support the EMC VNX1 Series arrays (VNX5300, 5500) for File / NAS.
SRM needs NAS gateway (VNX control station) to be running code version 8.1 or higher and VNX1 has never had file code over 7.1.83 and there are no plans for it.
So... if you have any EMC VNX1 Series arrays you CANNOT use SRM to monitor File/NAS....only Block (with an external SMI-S collector of course).
Here is a very basic page that explains it. (this would have been great to have for the POC and the architectural review discussion with Solar Winds support while planning the deployment)
https://support.solarwinds.com/Success_Center/Storage_Resource_Monitor_(SRM)/Knowledgebase_Articles/SRM_is_not_collecting_the_EMC_VNX_File_Storage_Data_but_the_block_storage_data_is_OK
Have a nice expensive platform that can only do half of what it was purchased for now.