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What does term 4 9's stand for ..

 
andy armstrong
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In no relation to the assignment but in general
what does availbe for 4 9's stand for?
 
Stephen Cowell
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My guess is 99.99%
 
Thomas Hofmann
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Availability: The system is 99.99 % available. This means that the system is down for 8.76 hours per year, e.g. for maintenance.
 
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