A company is building an application on Amazon EC2 instances that generates temporary transactional data. The application requires access to data storage that can provide configurable and consistent IOPS. What should a solutions architect recommend?
A.
Provision an EC2 instance with a Throughput Optimized HDD (st1) root volume and a Cold HDD (sc1) data volume.
B.
Provision an EC2 instance with a Throughput Optimized HDD (st1) volume that will serve as the root and data volume.
C.
Provision an EC2 instance with a General Purpose SSD (gp2) root volume and Provisioned IOPS SSD (io1) data volume.
D.
Provision an EC2 instance with a General Purpose SSD (gp2) root volume. Configure the application to store its data in an Amazon S3 bucket.
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Answer is C.
Please note that you cannot add HDD in root volume. SSD needs to be selected as root volume and HDD as Data Volume. Based on options given C is best answer
You CAN have HDD as root volume, even though A & B are not the right answer :
You can launch an instance from either an instance store-backed AMI or an Amazon EBS-backed AMI. The description of an AMI includes which type of AMI it is; you'll see the root device referred to in some places as either ebs (for Amazon EBS-backed) or instance store (for instance store-backed). This is important because there are significant differences between what you can do with each type of AMI. For more information about these differences, see Storage for the root device.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/RootDeviceStorage.html
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html
Provisioned IOPS SSD (io2 and io1) volumes attached to EBS-optimized instances are designed to offer consistent performance, delivering within 10% of the provisioned IOPS performance 99.9% of the time over a period.
EBS Volume Types
• EBS Volumes come in 6 types
• gp2 / gp3 (SSD): General purpose SSD volume that balances price and performance for
a wide variety of workloads
• io1 / io2 (SSD): Highest-performance SSD volume for mission-critical low-latency or
high-throughput workloads
• st1 (HDD): Low cost HDD volume designed for frequently accessed, throughputintensive
workloads
• sc1 (HDD): Lowest cost HDD volume designed for less frequently accessed workloads
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