A systems administrator is reviewing the Service Level Agreement (SLA) for a mission-critical database server which mandates "five nines" of availability. The administrator must configure the monitoring system's alerting thresholds to align with this requirement. Which of the following correctly describes the maximum tolerable downtime for this server to meet its SLA?
The correct answer reflects the downtime associated with "five nines" or 99.999% availability. This level of uptime allows for a maximum of approximately 5.26 minutes of downtime per year. This is calculated by taking the total minutes in a year (365 days * 24 hours/day * 60 minutes/hour = 525,600 minutes) and multiplying it by the allowed downtime percentage (100% - 99.999% = 0.001%). The other options represent different, lower availability levels: approximately 53 minutes of downtime is "four nines" (99.99%), approximately 8.75 hours is "three nines" (99.9%), and approximately 3.65 days is "two nines" (99.0%).
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How is downtime calculated for 'five nines' availability?
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What is the difference between 'five nines' and 'four nines' availability?
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Why is 'five nines' availability important for mission-critical systems?