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Compendium /

High availability is not cheap

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By Adam Gaffin
Network World Fusion 06/23/03

Even when using an open-source tool such as MySQL, you need to figure out just how much failure you can afford, Jeremy Zawodny writes. He quotes from Michael Conlen:

"Figure out what kinds of failures you can tolerate based on how many 9's you get and what kinds you have to design around. From there you can figure out a budget. 99.999% uptime is 5 minutes and 15 seconds per year of total downtime. 99.99% is 52.56 minutes and so on. At some point something will happen, and I've never seen anyone offer more than 5 9's, and IBM charges a lot for that."

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