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High-availability systems must be available most of the time. Service-level agreements (SLAs) specify your organization's availability expectations. System uptime can be expressed as three nines, four nines, or five nines. These expressions indicate system uptimes of 99.9 percent, 99.99 percent, or 99.999 percent.

How many downtime hours per year will be covered with an SLA of 99.9% uptime?

Answer :

Final answer:

A 99.9% uptime Service-Level Agreement (SLA) for a high-availability system allows for approximately 8.76 hours of downtime per year.

Explanation:

Service-level agreements, sometimes referred to as SLAs, are often used to designate the expected level of service between a provider and client. In the case of high-availability systems, a common way to express these expectations is through a concept known as 'uptime.' When you hear terms such as 'three nines' or '99.9%' uptime, this is expressing the percentage of time that a system is expected to be operational.

The implication of a 99.9% uptime SLA is that the system will be down for 0.1% of the time. Seeing as there are 525,600 minutes in a year (365 days * 24 hours * 60 minutes), a 0.1% downtime translates to 525.6 minutes, or roughly 8.76 hours of downtime a year. What this means is that with an SLA of 99.9%, it's acceptable for the system to be unavailable for almost 9 hours throughout the entire year.

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