1. A computer readable medium having stored thereon a data structure operable as a directory service, the data structure comprising: a first data field comprising a service level object map representing a data center and comprising data defining roles for the service level object map and policies for service level object map; and a second data field comprising a rack-level rack object map subordinate to and in relationship with the service level object map, representing a rack and supporting the directory service, and comprising data defining roles for the rack object map, and policies for the rack object map.