10
Front end Tier/ 
Mid Tier/ 
Back end Tier/ 
End Users 
Web Server  Application Server 
Database Server 
(B2C) 
D a t a   G e n e r a l 
Web Server 
Application 
Database 
Server 
Server 
Storage 
Server 
Laptop 
D a t a   G e n e r a l 
C o m  m   
P  o 
r  t 
S D 
B a y   
N  e t  w o r  k s 
B  a y S t  a c  k  4 5 0    1 2 T    
S  w i  t 
c h 
U p l i  n 
k    M o d u l e 
1 3 
1 4 
1 5  1 6 
1 
2 
3 
4 
5 
6 
7 
8 
9 
1 0 
1 1 
1 2 
1 
2  3 
4 
5  6 
7  8 
9  1 0  1 1 1 2  1 0 0 
1 0 
F   
D  x 
A c t 
i  v i t 
y 
Webswitch 
Computer 
Partners 
(B2B) 
D a t a   G e n e r a l 
Fig. 2.2. A Multi Tier Data Center Architecture
2.2
Cluster based Data Centers
A cluster based data center is a special type of a cluster based Web server. Fig 
ure 2.2 depicts the typical architecture of a cluster based data center or network server
consisting of three layers: front end Web server, mid level application server, and back 
end database server. A Web server layer in a data center is a Web system architecture
that consists of multiple server nodes interconnected through a System Area Network
(SAN). The front end Web server provides static or simple dynamic services. The Web
resources provided by the first tier are usually open to public, and thus, do not require
authentication or data encryption. Hence, the latency of the client's request in this layer
is usually shorter than in the application servers.
The mid tier, called the application server, is located between the web server and
the backend database. The application server has a separate load balancer and a security












  

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