Installing a Dual Server Desktop Architecture

Desktop Info Server Architecture Overview

Chapter 6 Desktop Info Servers

Desktop Info Server Architecture Overview

The Desktop Info Server architecture uses a Master Info Server and one or more Desktop Info Servers to share the duties normally performed by a single Info Server. Alerts appear for operators on a dual server desktop (DSD). The main functionality of the DSD is the same as a standard desktop; for operators, the DSD functions identically to a standard architecture.

DSDs connect to a single, Master Info Server when performing writes, but read alert data from Desktop Info Servers. This ensures rapid desktop responsiveness by updating the Desktop Info Servers, while maintaining high data integrity and consistency by simultaneously updating the Master Info Server. Figure 6-1shows an example DSD architecture.

Figure 6-1 Dual Server Desktop Architecture

Desktop Info

Server A

IDUC connection

Unidirectional

gateway

	SQL connection	SQL connection
Dual server	Master info	Dual server
Dual server	server	Dual server
desktop A		desktop B
	Unidirectional	IDUC connection
	gateway	IDUC connection
		Desktop Info
		Server B

122504

The DSD connects simultaneously to the Desktop Info Server and the Master Info Server. Any user actions (for example, tools or journal actions) performed in the DSD are sent directly to the Master Info Server through a one way SQL connection and are optionally sent to the Desktop Info Server through an IDUC connection.

Alerts in the Master Info Server are sent to the DSD through the Desktop Info Server. This is achieved using a unidirectional gateway from the Master Info Server to the Desktop Info Server and an IDUC connection from the Desktop Info Server to the DSD.

When users start an Info Desktop, they must select an Info Server to connect to. If the Info Server that the user connects to is configured to use a DSD architecture, then the Info Desktop connects to the Master Info Server when performing write operations but connects to one or more Desktop Info Servers when performing read operations.