Instance Store and EBS Volume
Question
Which of the following statements are correct with respect to the instance store and EBS volume? Please select 2 correct options.
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D. E.Answer: B, D.
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/InstanceStorage.htmlAmazon Elastic Block Store (Amazon EBS) provides block-level storage volumes for use with EC2 instances.
EBS volumes are highly available and reliable storage volumes attached to any running instance in the same Availability Zone.
EBS volumes attached to an EC2 instance are exposed as storage volumes that persist independently from the life of the instance.
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/AmazonEBS.htmlOption A is not correct.
Option B is correct.
Option C is not correct.
Instance store persists during reboots, not during the stop and start of the instance.
Option D is correct.
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/add-instance-store-Option E is not correct.
https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/InstanceStorage.html#instance-![Amazon EC2 Instance Store
An instance store provides temporary block-level storage for your instance. This storage is located on disks that are physically attached to the host computer. Instance
store is ideal for 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.
An instance store consists of one or more instance store volumes exposed as block devices. The size of an instance store as well as the number of devices available varies
by instance type. While an instance store is dedicated to a particular instance, the disk subsystem is shared among instances on a host computer.
The virtual devices for instance store volumes are ephemeral [@-23]. Instance types that support one instance store volume have ephemeral®. Instance types that support
two instance store volumes have ephemeral and ephemeral1, and so on.
Instance C
Instance B
ephemeraia ephemeral. ephemeral2. ephemera fephemeralO ephemeral. ephemeral? ephemerala
Instance store Instance store
Host Computer 1 Host Computer 2](https://eaeastus2.blob.core.windows.net/optimizedimages/static/images/AWS-Certified-Solutions-Architect-Associate/answer/imgquestions_lyj5na.png)
Instance store and EBS volume are two types of storage options available for Amazon Elastic Compute Cloud (EC2) instances in Amazon Web Services (AWS). Here's a detailed explanation of the statements given in the question:
A. Instance store backed EC2 instances will persist storage across instance stop, terminate, and failures.
This statement is incorrect. Instance store volumes are physically attached to the host computer that is running the EC2 instance. As a result, the data stored on instance store volumes is lost when the instance is stopped, terminated, or fails. Therefore, if you need to persist data, you should use an EBS volume instead.
B. EBS backed EC2 instances can persist storage across instance stop, terminate, and failures.
This statement is correct. EBS volumes are network-attached storage devices that persist data independently of the EC2 instance's lifecycle. Therefore, data stored on EBS volumes persists even when the instance is stopped, terminated, or fails.
C. Instance store backed EC2 instance will persist storage only during instance stop and start.
This statement is partially correct. Instance store volumes can persist data across instance stops and starts, but not across instance terminations or failures.
D. You cannot add instance store volumes once the EC2 instance is launched.
This statement is correct. Once an EC2 instance is launched, you cannot add instance store volumes to it. Instance store volumes are physically attached to the host computer, so they must be specified at instance launch time.
E. All available EC2 instance types support instance store and EBS volumes.
This statement is incorrect. Not all EC2 instance types support instance store volumes. Instance store volumes are available only on certain instance types, such as the C5d and M5d instances. However, all EC2 instance types support EBS volumes.
In summary, the correct statements in the question are B and D. EBS backed EC2 instances can persist storage across instance stop, terminate, and failures, and you cannot add instance store volumes once the EC2 instance is launched.