Amazon EFS ( Elastic File System) vs S3 vs Glacier

     

EFS

• EFS launched as Network storage device for EC2 Instances with unlimited storage and Pay for Use pricing model.

• Its Available as Preview http://aws.amazon.com/efs/pricing/
• Current pricing is  $0.30/GB-Month
• Network filesystem- it can be attached to any number of EC2 Instances and you can expect slight latency
• Expensive than EBS Storage. But you only pay for use.. Let say if you use 5 GB , you just pay for 5 GB. Not the full volume size as in the EBS.
• Amazon claims fully scalable unlimited disk size.

S3 (Simple Storage File System)

• Can be consider as an Backup storage location..
• Cheaper than  EFS or EBS Volume. 10% cost of EFS.
•  $0.03/GB/Month

Glacier

• Offline backup

• Cheapest Storage
• Need to wait atleast 4 hours if you want your old glacier backup to be available to read it back
• Starts from $0.01/GB/Month
• Good for Long term backup.

For more information about EFS