192 WebSphere Application Server V8.5 Concepts, Planning, and Design Guide
Under such circumstances, it is possible for a “domino effect” to occur, with the back-end
problem affecting all related layers. Therefore, consider combining the new features in
WebSphere Application Server V8.5, as explained in “Failover support” on page 187, with
your scalability schema for a more resilient environment.
Consider the following guidance when planning your scaling strategy:
Scale in a maintainable manner.
If your topology grows too complex, it is difficult to apply maintenance work, and you end
up with an error-prone environment.
Try to keep consistent versions of your operating systems and servers.
Although it is possible to run cell nodes in diff ...