Four 9's means the system must be running 99.99% of the time - which means downtime is .01% overall. Which works out to: 365 * 24 * 60 * .01 = 52.56 days hours minutes % downtime minutes Less than 1 hour/year downtime.
SCJP, SCJD, SCEA 5 "Any sufficiently analyzed magic is indistinguishable from science!" Agatha Heterodyne (Girl Genius)
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