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This DR site is an active standby , as opposed to a cold  site or warm  site. It is also called a hot  site because the servers are running or are in use. A warm site is one where the servers are running but not connected to the external environment, and a cold site is one where the servers and applications are physically present, but nothing is running. 

Figure 18-17 is an implementation-specific diagram of the WebSphere Application Server services configuration in this instance. It shows the use of WebSphere Application Server Network Deployment. This diagram outlines the use clusters, cells, and nodes. 

<img src='content_image/1011549.jpg'>

The reason for showing this specific aspect of the solution is that this configuration is where WebSphere Application Server Network Deployment is needed to manage the Enterprise JavaBeans (EJB) transactions between IBM Content Navigator and the IBM Content Platform Engine service. To get to the HA requirements, this type of implementation is needed. 

Note:  There are other configuration options that support an HA configuration. This one is chosen due to the requirements listed. 

