We will start the discussion on availability by discussing the attributes of a simple entry-level configuration based on standard off-the-shelf products without additional resources or configuration for availability. It is unlikely that this configuration will be used in production. Its value is as a baseline from which we can build in availability.
This figure illustrates:
As an entry-level configuration, all three servers – the application server, integration server and agent server – run on a single node (node-a) along with the database server.