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EF & E-Series, SANtricity, and Related Plug-ins
I can detect E series from Sancity store manager after 2 years runing
You may verify network connectivity to the storage array controllers and ensure port 2463 is reachable.
https://kb.netapp.com/on-prem/E-Series/Hardware-KBs/What_are_the_network_ports_utilized_by_an_E_Series_array
If physical access is available, check and make sure network cables are connected and that the controllers are both showing the shelf ID on their digital display.
Learn more about NetApp's CVE Security portal in this walkthough of the site.
Learn the ins and outs of access roles on the NetApp Support Site.