A Server Load Balancing Configuration - D-Link NetDefendOS User Manual

Figure 10.9. A Server Load Balancing Configuration
Additional Benefits of SLB
Besides improving performance and scalability, SLB provides other benefits:
• SLB increases the reliability of network applications by actively monitoring the servers
sharing the load. NetDefendOS SLB can detect when a server fails or becomes congested and
will not direct any further requests to that server until it recovers or has less load.
• SLB can allow network administrators to perform maintenance tasks on servers or
applications without disrupting services. Individual servers can be restarted, upgraded,
removed, or replaced, and new servers and applications can be added or moved without
affecting the rest of a server farm, or taking down applications.
• The combination of network monitoring and distributed load sharing also provides an extra
level of protection against Denial Of Service (DoS) attacks.
SLB Deployment Considerations
The following issues should be considered when deploying SLB:
• Across which servers is the load is to be balanced.
• Which SLB algorithm will be used.
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Chapter 10: Traffic Management