H19-338_V3.0 · Question #333
The system availability is 99.999%, indicating that the annual interruption time of the storage array is about 5 minutes.
The correct answer is A. True. Option A is correct because 99.999% availability, often called "five nines," means the system is unavailable for 0.001% of the year. Multiplying 0.001% by the total minutes in a year (525,600) gives approximately 5.256 minutes of allowable downtime, which rounds to about 5…
Question
The system availability is 99.999%, indicating that the annual interruption time of the storage array is about 5 minutes.
Options
- ATrue
- BFalse
How the community answered
(32 responses)- A78% (25)
- B22% (7)
Explanation
Option A is correct because 99.999% availability, often called "five nines," means the system is unavailable for 0.001% of the year. Multiplying 0.001% by the total minutes in a year (525,600) gives approximately 5.256 minutes of allowable downtime, which rounds to about 5 minutes annually. Option B is wrong because rejecting this statement would imply the math does not hold, but the calculation is straightforward and well-established in the industry. Memory tip: count the nines to estimate downtime -- one nine (90%) allows roughly 36 days, two nines (99%) allow about 3.6 days, three nines allow ~8.7 hours, four nines allow ~52 minutes, and five nines allow ~5 minutes; each additional nine reduces downtime by roughly a factor of ten.
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