Do note that for Red Hat Enterprise Virtualization you must attach a directory server to the Manager using the Domain Management Tool, engine-manage-domains. This configuration sis for RHEV 3.5
Active Directory
Identity Management (IdM)
Red Hat Directory Server 9 (RHDS 9)
OpenLDAP

# rhevm-manage-domains add --domain=your_active_directory_domain --user=spmstest --provider=ad

Restart the ovirt-engine

# service ovirt-engine restart