The startup mode specifies
      the state in which a server instance should be started. The default is
      to start in the RUNNING state.
RUNNING state, a server offers its services to
            clients and can operate as a full member of a cluster.
          ADMIN state, the server is up and running, but
            available only for administration operations, allowing you to
            perform server and application-level administration tasks without
            risk to running applications. For more information, see ADMIN
            State.
          STANDBY state, a server can accept administration
            commands and participate in cluster communication, but is not
            accessible for requests that come from external clients. If you
            specify STANDBY, you must also enable the
            domain-wide administration port. See Configure the domain-wide
  administration port.
          After you finish
Start Managed Servers. See: