EFS Key Details:

• While EBS mounts one EBS volume to one instance, you can attach one EFS volume across multiple EC2 instances.
• The EC2 instances communicate to the remote file system using the NFSv4 protocol. This makes it required to open up the NFS port for our security group (EC2 firewall rules) to allow inbound traffic on that port.
• With EFS, you only pay for the storage that you use so you pay as you go. No pre-provisioning required.
• EFS can scale up to the petabytes and can support thousands of concurrent NFS connections.
• It is best for file storage that is accessed by a fleet of servers rather than just one server