EC2

Question 1

On-Demand Capacity Reservations

Answer 1

On-Demand Capacity Reservations enable you to reserve compute capacity for your Amazon EC2 instances in a specific Availability Zone for any duration. This gives you the ability to create and manage Capacity Reservations independently from the billing discounts offered by Savings Plans or Regional Reserved Instances.

Question 2

What is an Elastic Fabric Adapter (EFA)

Answer 2

An Elastic Fabric Adapter is an AWS Elastic Network Adapter (ENA) with added capabilities. The EFA lets you apply the scale, flexibility, and elasticity of the AWS Cloud to tightly-coupled HPC apps

Question 3

What happens, if we hibernate an EC2 instance?

Answer 3

When you hibernate an instance, Amazon EC2 signals the operating system to perform hibernation (suspend-to-disk). Hibernation saves the contents from the instance memory (RAM) to your Amazon Elastic Block Store (Amazon EBS) root volume. Amazon EC2 persists the instance’s EBS root volume and any attached EBS data volumes. When you start your instance:

• The EBS root volume is restored to its previous state
• The RAM contents are reloaded
• The processes that were previously running on the instance are resumed
• Previously attached data volumes are reattached and the instance retains its instance