CompTIA Cloud Essentials+ (CLO-002)Cloud ConceptsHard
A cloud provider offers a service level agreement (SLA) for a data storage service with 99.999% (five nines) availability. Assuming a standard year, what is the maximum acceptable amount of downtime, to the nearest second, for this service annually?
- A3.15 seconds
- B5.26 minutes
- C315.36 minutes
- D31.54 seconds
Show answer & explanationAnswer & explanation
Correct answer: D. 31.54 seconds
First, calculate total seconds in a year: 365 days * 24 hours/day * 60 minutes/hour * 60 seconds/minute = 31,536,000 seconds. Then, calculate the allowed downtime percentage: 100% - 99.999% = 0.001%. Finally, multiply total seconds by the downtime percentage: 31,536,000 * 0.00001 = 31.536 seconds. Rounded to the nearest second, this is 31.54 seconds.
Why the other options are wrong
- A. Incorrect calculation, too low.
- B. Calculated in minutes, not seconds, and potentially wrong percentage.
- C. Calculated in minutes, not seconds, and wrong percentage.
SLA Availability (Five Nines)
A service level agreement guaranteeing 99.999% uptime, translating to very minimal downtime per year, often associated with mission-critical systems.
- 99.999% uptime is known as 'five nines'.
- Corresponds to approximately 5 minutes and 15 seconds of downtime per year.
- Requires robust architecture, often multi-region active-active.
Memory trick: Five Nines: Only 31 seconds gone, like a quick blink.