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What does this mean?

 
Anonymous
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Hi everyone.
I have just downloaded part 2 and there is a sentence in the assignmenty that I don't understand the meaning of. The sentence is about the availability of a service, and the text that I dont undestand is:

"They have committed to have their site available four 9's"
What do "available four 9's" mean? Anyone?
Thanks.
 
Anonymous
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99,99% right?
Andr´┐Ż
 
herve attia
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Right !
your service must be available 99.99% of the time!
 
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