EFS

Question 1

What technology is EFS based upon?

Answer 1

NFS, or Network File Store

Question 2

What is EFS?

Answer 2

Elastic storage where you pay for what you use, in contrast to EBS where you pay whether or not you’re actually using the space.

Question 3

Why is EFS not always an ideal solution?

Answer 3

Cost. It is 3x more expensive than EBS, and about 20x more expensive than s3. Keep this in mind for the exam.

Question 4

How does EFS ensure data redundancy?>

Answer 4

It is replicated across all AZs in a particular region.

Question 5

Are EFS mount points configurable across more than one AZ?

Answer 5

Yes, since EFS is replicated across all AZs, you can mount the EFS to EC2 instances across any AZ. This makes for a great multi-AZ system.

Question 6

Can EFS be used on-prem?

Answer 6

Yes, however, it’s limited to two options:

1. It requires Direct Connect
2. Alternatively, you can use the EFS File Sync agent.

Question 7

ou have decided to use EFS for sharing files across many EC2 instances and you want to be able to tolerate an AZ failure. You should:

Answer 7

Create EFS mount targets in each AZ and configure each EC2 instance to mount the common mount target FQDN