In this chapter, we illustrate a generic architecture of a cluster based Web server
and a cluster based data center, which are the main infrastructure studied in this the
sis. Usually intra cluster communications are facilitated by a low overhead and high
bandwidth user level communication scheme. Thus, the concept of the user level com
munication is summarized in this chapter.
Cluster based Web Servers
Layer 4 or Layer 7
Fig. 2.1. A Cluster based Web Server Architecture