2. A cloud provider is deploying a new SaaS product comprised of a cloud service. As part of the deployment, the cloud provider wants to publish a service level agreement (SLA) that provides an availability rating based on its estimated availability over the next 12 months. First, the cloud provider estimates that, based on historical data of the cloud environment, there is a 25% chance that the physical server hosting the cloud service will crash and that such a crash would 2 days before the cloud service could be restored. It is further estimated that, over the course of a 12 month period, there will be various attacks on the cloud service, resulting in a total of 24 hours of downtime. Based on these estimates, what is the availability rating of the cloud service that should be published
What will be an ideal response?
Availability calculation:
0.25 crash probability x 48 hours crash recovery = 12 hours
12 hours crash downtime + 24 hours attack downtime = 36 hours downtime
24 hours x 365 days = 8,760 total hours during measured period
36 / 8,760 = 0.004
0.004 x 100 = 0.4
100 = 0.4 = 99.6
The availability rating is 99.6%
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