Chapter 35. Planning Fault Tolerance and Avoidance

Every system administrator dreams of “five-nines” of availability (99.999 percent availability), but those who have actually committed to a five-nines Service Level Agreement (SLA) would probably describe those dreams as being closer to nightmares. Building highly available systems is hard work, and building a system that is unavailable for no more than about 5 minutes in a year is really hard work. And very, very expensive.

In this chapter, we won’t cover everything you need to know to build a five-nines system—that is a very specialized task that could easily take up a whole ...

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