1.2.2 Ensuring availability by allocating multiple hosts with same configuration
You can allocate multiple hosts with the same configuration to use the load balancer, and to degenerate the operations just by stopping the faulty host, thereby ensuring the availability of the entire system. You can set up a Web front system with assured availability by allocation of multiple hosts with same configuration by adding duplicated hosts with the same configuration, and by allocating the load balancer, based on the single Web front system.
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Example of system setup
The following figure shows the configuration example of a Web front system with assured availability by allocating multiple hosts with the same configuration:
Figure 1‒4: Configuration example of Web front system with assured availability by allocating multiple hosts with the same configuration -
Tasks and their necessity
The following table describes various tasks to be executed for setting up a Web front system with assured availability by allocating multiple hosts with same configuration and the necessity of these tasks:
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Y: Mandatory tasks.
A: Tasks to be executed with the execution conditions are fulfilled.
#: In the Example of system setup described in this manual, connection with the database is a prerequisite. Therefore, this task is mandatory.