WebSphere Application Server V7.0: Concepts ... - IBM Redbooks

User
Outside World DMZ Internal Network
I
N
T
E
HTTP/HTTPS
R
N
E
T
Protocol Firewall
Web
Server
Web Server
Plug-in
System A
Application
Server 1
Application
Server 2
Application
Server 3
Cluster
System B
Figure 5-3 Vertical scaling topology with WebSphere Application Server
This vertical scaling example includes a cluster and three cluster members. The
Web server plug-in routes the requests according to the application server’s
availability. Some basic load balancing is performed at the Web server plug-in
level based on a weighted round-robin algorithm.
Vertical scaling can be combined with other topologies to optimize the
performance, throughput, and availability.
144 WebSphere Application Server V7.0: Concepts, Planning, and Design
Domain Firewall
System C
Deployment
Manager
Directory and
Security
Services
Existing
applications
and data
Note: The illustration in Figure 5-3 is intended to show a vertical scaling
topology of application servers but still contains several single points of
failures.