Because hierarchical zones enable profile attributes to be inherited, defining the business rules for new users and groups in the parent zone enables the Zone Provisioning Agent to generate consistent profiles for all child zones.
When you define a UNIX profile for a group or a user in a parent zone, the attributes are automatically inherited by all child zones. For groups, inheritance makes the group GID and group name available in all child zones. For users, inheritance gives every user defined in the parent zone the potential to log on to every UNIX computer. You then use role assignments to control which computers users can actually access, and, once you begin defining custom roles, what they can do on those computers.
By default, all of the attributes in each new profile are inherited from the parent zone. You can then override any of the attributes as needed in each of the child zones or on individual computers on a case-by-case basis. This flexibility enables you to establish a consistent UID and GID namespace across all zones based on unique SID and sAMAccountName values, while granting exceptions to the specific cases where you need them.
For individual computers, UNIX user and group profiles are inherited from the zone the computer has joined. Typically, this is a child zone or the child of a child zone. You can manually override any attribute or set of attributes for individual computers. Any attributes you do not override are inherited from the zone and the business rules you defined for the Zone Provisioning Agent.