Hi @JohnPark ,
NetApp documentation reads "When creating a CIFS share, the user will need to create a Security Service with any of the 3 options (LDAP, Active Directory or Kerberos) and then add this Security Service to the already created Share Network."
OpenStack documentation reads "For authentication and authorization of clients, the Shared File Systems Storage service can optionally be configured with different network authentication protocols. Supported authentication protocols are LDAP, Kerberos, and Microsoft Active directory authentication service."
My thoughts are that the NetApp Manilla driver requires LDAP, Active Directory or Kerberos. I guess the use case for local users and groups on NetApp is an edge case.
References:
OpenStack Docs: Key Concepts
Security services — Security Guide documentation