Determining the most affected components
This step involves mapping the most important site characteristics to each component. Once again, from a scalability viewpoint, the key components of the infrastructure are the dispatchers or edge servers, the Web appservers, security services, transaction and data servers, and the network. Table 2-7 specifies the significance of each workload characteristic to each component. As seen in the table, the effect on each component is different for each workload characteristic.
Whenever we use the terms dispatchers or edge servers throughout this chapter, we are referring to a technology that includes a variety of hardware and software solutions, one of which is the Load Balancer from the IBM WAS Network Deployment V5.1 Edge Components.
Workload characteristics Web present. server Web app. server Network Security servers Firewalls Existing business servers Database server High volume, dynamic, transactional, fast growth High High High High High High High High % user-specific responses Low High Low Low Low High High High % cross-session information Med High Low Low Low Low Med High volume of dynamic searches High High Med Low Med Med High High transaction complexity Low High Low Med Low High High High transaction volume swing Med High Low Low Low High High High data volatility High High Low Low Low Med High High # unique items Low Med Low Low Low High High High # page views High Low High Low High Low Low High % secure pages (privacy) High Low Low High Low Low Low High security High High Low High Low High Low WebSphere is a trademark of the IBM Corporation in the United States, other countries, or both.
IBM is a trademark of the IBM Corporation in the United States, other countries, or both.