[Reference:https://library.netapp.com/ecm/ecm_download_file/ECMLP2848253, , Gateway Node and Primary Admin Node are two roles that you can run in a NetApp StorageGRID service appliance. A Gateway Node provides access to StorageGRID using S3 orSwift protocols. A Primary Admin Node hosts the Grid Manager and Tenant Manager interfaces and performs administrative tasks for StorageGRID.]