46 Highly Available WebSphere Business Integration Solutions
3.7 Capacity planning
In an HA cluster environment where under normal operations each node only
runs one application, the nodes will be configured for mutual takeover.
Therefore, the IT professional must consider that in a failover scenario, each
node should be capable of supporting both applications. To gather the hardware
requirements, one must consult the standard system installation guides of each
application. However, there are certain requirements that are specific to an HA
environment:
The requirement is that you have at least two nodes. For example, you could
have two IBM pSeries 670s, or you could have a single IBM pSeries 690. The
reason that a single p690 will work is ...