EFS

Question 1

Which AWS service provides scalable, elastic, concurrent (with some restrictions), and encrypted file storage for use with both AWS services and on-premises resources?

Answer 1

Elastic File System (EFS) - implements NFSv4

Question 2

What is the resiliency posture of the EFS service?

Answer 2

EFS is a region-resilient service

Question 3

Can EFS be used with Windows systems?

Answer 3

No, EFS can only be mounted on Linux-based systems, including EC2 instances

Question 4

How do other services access the EFS service?

Answer 4

EFS is isolated to the VPC in which it is provisioned and is accessed through mount targets located in subnets within the VPC, these mount targets have IP addresses

Question 5

How can the EFS service be accessed from on-premises systems?

Answer 5

EFS can be accessed from on-premises systems via VPN Connection, or Direct Connect

Question 6

What family of standards is specified by the IEEE Computer Society, for maintaining compatibility between operating systems (the interface that Linux-based systems understand)?

Answer 6

Portable Operating System Interface (POSIX)

Question 7

What are the two performance modes available in EFS?

Answer 7

• General Purpose (default, used 99% of the time): Suitable for latency-sensitive use cases, such as web servers, content management, and general file serving
• Max I/O: Designed for high throughput and IOPS but may have increased latency, ideal for big data, media processing, and scientific analysis (parallel computing workloads)

Question 8

What are the two throughput modes available in EFS?

Answer 8

• Bursting Throughput: Similar to gp2 EBS volumes, throughput scales with EFS size
• Provisioned Throughput: Throughput can be specified independently of EFS size

Question 9

What are the two storage classes available in EFS?

Answer 9

• Standard (default): For storing frequently accessed data
• Infrequent Access: For storing infrequently accessed data

Question 10

What is the ideal use case for the Amazon EFS service?

Answer 10

• Web serving and content management
• Enterprise applications
• Media and entertainment
• Home directories
• Database backups
• Developer tools
• Container storage
• Big data analytics

Question 11

How can high availability be achieved with Amazon EFS?

Answer 11

By placing mount targets in multiple AZs