Like I said, it's really down to the NetApp filer permissions settings, EV doesn't have control over this part. It is the same when you assign permissions on the SAN when it is being used for Vault Store partitions. EV does not play or alter with NTFS permissions.
Check this part of the Install and Config guid:
Setting the permissions on a NetApp Filer
Before configuring a NetApp Filer for archiving, you must give the Vault Service
account administrative permissions on the file server.
To set the permissions on a NetApp Filer
1 Add the Vault Service account as an Administrator on the NetApp filer by
following these steps in the order listed:
■ Log on to a Windows server as a user who already has administrative
rights on the NetApp filer.
■ On the Windows desktop, right-click MyComputer and then, on the
shortcut menu, click Manage.
■ In Computer Management, select Connectto anothercomputer from the
Action menu and then enter the name of the NetApp filer.
2 Expand Local Users and Groups and click Groups.
3 In the right pane, right-click Administrators and then, on the shortcut menu,
click Add to Group.
4 Click Add to add the Vault Service account to the list of group members.
Although this part is geing perperaed for EV FSA file server target. You might to check with Tech Support to see if NetApp being used as Vault Store partitions is officially supported.