In this last chapter, we set up a couple of performance testing tools for the example services that you need to make highly available in your cluster, and provided a few suggestions to optimize their performance separately as well. Note that those suggestions are not intended to represent an exhaustive list of tuning methods, but a starting point instead. We have also provided the overall instructions so that you can convert an A/P cluster into an A/A one.
Finally, keep in mind that this book was written using virtual machines instead of specialized hardware. Thus, we have run into some associated limitations, such as the lack for real STONITH devices that would otherwise have allowed us to actually demonstrate the functionalities of an A/A cluster. However, the principles outlined in this book will undoubtedly be a guide to set up your own clusters, whether you are experimenting with virtual machines as well or using real hardware.
Best of success in your endeavors!