Section 6: EC2 Instance Storage

Question 1

What is an EBS Volume?

Answer 1

It is a network drive you can attach to your instances while they run

Question 2

True or False
Will the data in an EBS volume be lost when the instance it is attached to is terminated?

Answer 2

False
Once the an EBS volume has been attached to an instance, the data would be still available after the instance termination if the delete on termination option is not selected.

Question 3

Can an EBS volume be attached to only one instance at a time?

Answer 3

No, some EBS Volume have the “multi-attach” feature.

Question 4

What is the limitation of EBS volumes in terms of availability zone?

Answer 4

EBS volume are bound to an specific availability zone.

Question 5

What is an AMI

Answer 5

AMI stands for Amazon Machine Image and it is a customization of an EC2 instance.

Question 6

What are the characteristics of an EC2 instance store

Answer 6

• They are a High-Performance hardware disk
• Once the EC2 instance is stopped, the instance store will be lost
• Good for buffer, cache
• Risk of losing data if there is any issues with an EC2 instance

Question 7

What are the different types of EBS volumes?

Answer 7

1. General Purpose (SSD)
2. Provisioned IOPS (SSD)
3. Throughput Optimized (HDD)
4. Cold HDD

Question 8

Which family of EBS volumes support multi-attach?

Answer 8

io1/io2 family

Question 9

What is a use-case for EBS multi-attach?

Answer 9

High-Availability Database Clusters: EBS Multi-Attach can be used to provide high-availability for database clusters, such as Amazon RDS. By allowing multiple EC2 instances to attach to the same EBS volume, you can ensure that your database remains available even if one or more EC2 instances fail.

Question 10

How many instances can a multi-attach EBS volume be attached to at once?

Answer 10

16

Question 11

Which family of EBS volume can be used as a boot volume?

Answer 11

gp2, gp3, oi1, oi2 Block Express

Question 12

What kind of EBS volume would be better for data that is not frequently accessed?

Answer 12

Cold HDD Volume

Question 13

What does EFS stand for?

Answer 13

Elastic File System

Question 14

Main characteristics of EFS

Answer 14

• Need a security group to gain access to EFS
• Only compatible with Linux based AMI
• File system scales automatically (pay-per-use)

Question 15

What are the types of Storage Tiers for EFS?

Answer 15

• Standard: For frequently accessed files
• Infrequent access (EFS - IA): Cost to retrieve files, lower price to store. It can be enabled with a Lifecycle Policy.

Question 16

What are the EFS storage types by availability?

Answer 16

Standard: Multi Availability Zone
One Zone: It is compatible with EFS-IA, backup enabled by default.