A company is migrating a NoSQL database cluster to Amazon EC2. The database automatically replicates data to maintain at least three copies of the data. I/O throughput of the servers is the highest priority. Which instance type should a solutions architect recommend for the migration?
A. Storage optimized instances with instance store
B. Burstable general purpose instances with an Amazon Elastic Block Store (Amazon EBS) volume
C. Memory optimized instances with Amazon Elastic Block Store (Amazon EBS) optimization enabled
D. Compute optimized instances with Amazon Elastic Block Store (Amazon EBS) optimization enabled
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For me A is the right one in this specific case.
Database is replicated automatically across 3 instance, so Instance Store in great because even if you can loose data (if EC2 fails or terminates) you still have 2 copies of data.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/storage-optimized-instances.html
Answer is C,