About this quiz question of EC2:
You need to run a VERY price sensitive workload once a month that cannot be interrupted and must run continuously for up to six hours. Which sort of EC2 billing model should you use?
Spot market
On demand instances
Reserved instances
Spot block
The answer is spot block with the notes that this feature is actually retiring, but it’s still valid for the exam.
I want to ask why not use scheduled RIs? It satisfies the condition "a predictable recurring schedule that only requires a fraction of a day, a week, or a month"
Is it because spot is cheaper so whenever possible should choose spot instance? If so, when should choose scheduled RIs over spot instance with spot block?
1 Answers
Reserved Instances have to be purchased in increments of 1 to 3 years. As this is a job that runs for a few hours, once per month, Reserved Instances are not a cost-effective option.