1
Q

What technology is EFS based upon?

A

NFS, or Network File Store

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2
Q

What is EFS?

A

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.

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3
Q

Why is EFS not always an ideal solution?

A

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

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4
Q

How does EFS ensure data redundancy?>

A

It is replicated across all AZs in a particular region.

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5
Q

Are EFS mount points configurable across more than one AZ?

A

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.

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6
Q

Can EFS be used on-prem?

A

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

  1. It requires Direct Connect
  2. Alternatively, you can use the EFS File Sync agent.
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7
Q

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:

A

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

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