English version

five nines

From Longman Business Dictionary
Related topics: Computers
five ninesˌfive ˈnines (also five nines reliability) noun [uncountable]COMPUTING a computer or computer system with five nines reliability, or which has five nines, is almost certain never to break or go wrongOur server has just five minutes of downtime a year. That’s 99.999 per cent availability, the five nines to which other hardware companies can only aspire.
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