Test-1 Flashcards
A research group runs its flagship application on a fleet of Amazon EC2 instances for a specialized task that must deliver high random I/O performance. Each instance in the fleet would have access to a dataset that is replicated across the instances by the application itself. Because of the resilient application architecture, the specialized task would continue to be processed even if any instance goes down, as the underlying application would ensure the replacement instance has access to the required dataset.
Which of the following options is the MOST cost-optimal and resource-efficient solution to build this fleet of Amazon EC2 instances?
Use Instance Store based Amazon EC2 instances
Use Amazon Elastic Block Store (Amazon EBS) based EC2 instances
Your answer is incorrect
Use Amazon EC2 instances with Amazon EFS mount points
Use Amazon EC2 instances with access to Amazon S3 based storage
Use Instance Store based Amazon EC2 instances
An instance store provides temporary block-level storage for your instance. This storage is located on disks that are physically attached to the host instance. Instance store is ideal for the temporary storage of information that changes frequently such as buffers, caches, scratch data, and other temporary content, or for data that is replicated across a fleet of instances, such as a load-balanced pool of web servers. Instance store volumes are included as part of the instance’s usage cost.
As Instance Store based volumes provide high random I/O performance at low cost (as the storage is part of the instance’s usage cost) and the resilient architecture can adjust for the loss of any instance, therefore you should use Instance Store based Amazon EC2 instances for this use-case.
