Reportedly by Michael Conlin (somewhere in the MySQL archives - Jeremy Z wasn't too clear where.)
"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. Then, figure out everything that could cause an outage, figure out how to work around them and give them a budget. Watch how many 9's come off that requirement. "
June 21, 2003 1:01 PM
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