Amazon EFS (Elastic File System)

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Amazon EFS (Elastic File System) provides a simple, scalable, fully managed elastic NFS (Network File System) for UNIX, Linux, and Windows file systems. With Amazon EFS, you can easily move your Amazon EC2-based applications that require shared file storage to AWS. Amazon EFS is designed to scale on demand so you can grow your file system as your application needs grow.
Amazon EFS is a fully managed service that simplifies shared file storage. It allows multiple EC2 instances to access the same file system concurrently via NFS. With Amazon EFS, storage capacity scales automatically so there is no need to provision storage upfront or scale access capacity servers. You pay only for the storage you use, so applications can start small and grow as needed. 

Some key features of Amazon EFS include:

- Elastic scaling - No need to provision storage capacity upfront. Storage is automatically expanded as you store more data without needing to allocate new storage in advance.

- High durability - Data is stored across multiple Availability Zones (AZs) within a region so that the loss of one AZ does not affect file access performance.

- Resilient - Amazon EFS supplies enough redundancy to support the simultaneous failure of two Availability Zones without data unavailability or performance degradation.

- Network performance - Amazon EFS provides high file throughput and low latencies using an optimized network stack and placement in multiple Availability Zones. 

- Automatic versioning - Amazon EFS automatically tracks a file's history every time it is modified. Prior versions are retained until explicitly deleted.

To use Amazon EFS, you simply create a file system, mount the file system on your EC2 instances, and begin accessing the shared storage. Billing is based on the amount of storage used and data transfer into and out of the file system. There are no upfront costs or per-instance fees. 

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