Respuesta :
If one wishes to maintain a "4 nines" availability rating, 8 seconds is the maximum amount of down time he can have per day
We must keep a downtime of 8 seconds here for 99.99, and as the number of nines rises, the downtime second gets less.
There is a difference between planned and unplanned downtime. Scheduled downtime typically results from maintenance that interferes with system performance and is typically unavoidable with an already-installed system design.
System software patches that call for a reboot or configuration modifications that only take effect after a reboot are examples of scheduled downtime events. In general, a logical, management-initiated event leads to scheduled downtime most of the time. Unplanned downtime incidents often result from a physical occurrence, like a software or hardware malfunction or environmental aberration.
To learn more about downtime refer here:
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