this 2% is just a euphemism to say from "perfect" to "almost perfect". of course "almost perfect" is similar to "imperfect" or "faulty".
99.x% of availability is equal to say "it can fail anytime".
99% of *warranted* availability is different,its about the service provider is using a backup (or second plan) system.
99.9% of warranted availability is even further, they have all the goodness: hot swap,mirror,raid and secondary system running at parallel.
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