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AWS Certified Solutions Architect study material · question 458 of 500

Why do instance types billed for high I/O performance show less variance in that performance?

  1. They cache all I/O in instance memory
  2. They are always placed in a cluster placement group
  3. They receive a larger allocation of the host's shared resources
  4. They run on dedicated hardware with no other tenants
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Answer: C. They receive a larger allocation of the host's shared resources

A larger share of the shared network and disk subsystem both raises the floor of performance and reduces its variance.

Source: Amazon EC2 instance types (Amazon Web Services) — Amazon EC2 instance types

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