CompTIA Cloud Essentials+ (CLO-002)Cloud ConceptsHard
A cloud provider offers a service level agreement (SLA) promising 99.99% availability for a critical application. How many minutes of downtime is permissible per month under this SLA?
- A4.32 minutes
- B0.432 minutes
- C432 minutes
- D43.2 minutes
Show answer & explanationAnswer & explanation
Correct answer: A. 4.32 minutes
To calculate this: 1 month = 30 days * 24 hours/day * 60 minutes/hour = 43,200 minutes. Downtime = (100% - 99.99%) * 43,200 minutes = 0.01% * 43,200 minutes = 0.0001 * 43,200 minutes = 4.32 minutes.
Why the other options are wrong
- B. This would be for 99.999% availability (five nines).
- C. This would be for 99% availability (two nines).
- D. This would be for 99.9% availability (three nines).
SLA Availability Calculation
Service Level Agreements (SLAs) define the uptime percentage. To calculate permissible downtime, convert the total period (e.g., month) into minutes and multiply by the inverse of the uptime percentage.
- Uptime percentage is typically 'nines' (e.g., 99.9%, 99.99%).
- Downtime = (1 - Uptime Percentage) * Total Time.
- Often calculated per month or year.
Memory trick: Total Time minus Uptime equals Downtime allowed.