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The Art of Scalability: Scalable Web Architecture, Processes, and Organizations for the Modern Enterprise, Second Edition by Michael T. Fisher, Martin L. Abbott

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Appendix A. Calculating Availability

There are many ways of calculating a site’s availability. Included in this appendix are five ways that this can be accomplished. In Chapter 6, Relationships, Mindset, and the Business Case, we made the argument that knowing your availability is extremely important to make the business case that you need to undertake scalability projects. Downtime equals lost revenue. Moreover, the more scalability projects you postpone or neglect to accomplish, the worse your outages and brownouts will be. If you agree with all of that, then why does it matter how you calculate outages or downtime or availability? It matters because the better job you do and the more everyone agrees that your method is the standard way of ...

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