If user_server_ha=Y is specified in the system environment definition, only the user server processes specified in the user service configuration definition can be activated before the standby OpenTP1 (standby system) is placed on standby status. In this case, note the following:

• The user server awaits for the running system to be changed to the standby system in the dc_rpc_open function. This means that exchange to the standby OpenTP1 is impossible unless the dc_rpc_open function is issued.
• OpenTP1 inherits the previous user server configuration. If the user server specified in the user service configuration definition in the previous online operation has come out of the configuration after exchange to the standby OpenTP1, return value DCRPCER_STANDBY_END is returned even when the dc_rpc_open function is issued. When that value is returned, the user must terminate the current process. The process of terminating the user server starts after exchange to the standby OpenTP1; much time is required until the process is restarted. To avoid this, the user is recommended to specify a user server in the user service configuration definition that will not end before system termination.
• When the standby OpenTP1 terminates, return value DCRPCER_STANDBY_END is also returned if the dc_rpc_open function is issued. The user must terminate the current process.