一项基于SSD，提供NFSv4兼容协议，允许多实例并发访问，跨AZ、支持IAM集成、支持访问控制的文件系统服务。从价格看就知道是EFS是个高端产品，想想也对，这个玩意看就是EBS的一个增值服务，Block上面叠加了FS，当然要比EBS贵

EFS价格：

• $0.30/GB-month

EBS价格：

• GP-EBS：$0.10/GB-month
• PIOPS-EBS：0.125/GB-month
• M-EBS：0.05/GB-month

S3价格：

• S3：0.03/GB-month

Glacier价格：

• Glacier：0.01/GB-month

Introducing Amazon EFS

Posted On: Apr 9, 2015

Amazon Elastic File System (Amazon EFS) is a file storage service for Amazon Elastic Compute Cloud (Amazon EC2) instances. Amazon EFS is easy to use and provides a simple interface that allows you to create and configure file systems quickly and easily. With Amazon EFS, storage capacity is elastic, growing and shrinking automatically as you add and remove files, so your applications have the storage they need, when they need it.

Amazon EFS supports the Network File System version 4 (NFSv4) protocol, so the applications and tools that you use today work seamlessly with Amazon EFS. Multiple Amazon EC2 instances can access an Amazon EFS file system at the same time, providing a common data source for workloads and applications running on more than one instance.

With Amazon EFS, you pay only for the storage used by your file system. You don’t need to provision storage in advance and there is no minimum fee or setup cost. Amazon EFS is designed for a wide variety of use cases like content repositories, development environments, and home directories. With on-demand scaling and performance, Amazon EFS is an ideal solution for Big Data applications.

The Amazon EFS Preview will be available soon. To learn more and request an invite to the Amazon EFS Preview visit http://aws.amazon.com/efs.