In a domain data file, three domain representative schedule services can be registered. Use the namdomainsetup command to register the host name of a domain representative schedule service. Only the superuser can register domain representative schedule services.

Register the port number of the domain representative schedule services in /etc/services. The port number of each domain must be the same and must be specified in the following format:

OpenTP1scd port-number/tcp alias-name

• OpenTP1scd is a constant.
• Specify tcp as the protocol name.
• Any alias name can be used.

Register the port number of the domain representative schedule service in the /etc/services files of all the hosts where OpenTP1 is activated. However, if operated by NIS, register the port number in /etc/services of only the NIS server.

If issuing a domain-specified dc_rpc_call() when no port number is registered in /etc/services, error is returned with DCRPCER_NO_PORT.

1. Schedule service definition
   Define the port number of the domain representative schedule service by specifying it in the scd_port operand of the schedule service definition. As the port number, specify the port number registered in /etc/services.
   
2. System common definition
   Set the nodes that configure the local domain. Specify the node names by the all_node operand in the system common definition.
   

When starting more than one schedule service (OpenTP1) in the same host for multiOpenTP1 operation or system switchover, the schedule services have different port numbers. If assigning more than one schedule service in the same host to the domain representative schedule service, it is impossible to perform domain communication between the specified schedule services by issuing a domain-specified dc_rpc_call(). To start more than one schedule service in the same host, assign only one of them to the domain representative schedule service. The following shows the required environment settings.

1. Registering the domain representative schedule service
   Register only one schedule service in the domain data file as the domain representative schedule service.
   
2. Registering the port number
   Only one port number in /etc/services is registered. Register the port number for the schedule service registered in the domain data file.
   
3. System definition
   Specify the port number for the domain representative schedule service by the scd_port operand in the schedule service definition. This is same as the port number registered in /etc/services.
   Specify the names of the nodes that configure the local domain by the all_node operand.