8
Chapter 2
Background
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.
2.1
Cluster based Web Servers
Node 1 
client 
Network Interface 
Controller 
SAN 
client 
Node 2 
Layer 4 or Layer 7 
client 
webswitch 
Network Interface 
Controller 
Disk 
Node N 
client 
Network Interface 
Controller 
Fig. 2.1. A Cluster based Web Server Architecture












  

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