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While S3 provides object storage and EBS provides block storage, many workloads require shared file storage — a file system that multiple servers can mount and access concurrently. Amazon Elastic File System (EFS) and Amazon FSx address this need.
EFS is a fully managed, elastic, POSIX-compliant file system for Linux workloads. It grows and shrinks automatically as you add and remove files — no provisioning required.
| Feature | Detail |
|---|---|
| Protocol | NFS v4.0 and v4.1 |
| Elasticity | Automatically scales from zero to petabytes |
| Concurrency | Thousands of EC2 instances can mount the same file system simultaneously |
| Availability | Data stored across multiple AZs (Standard) or single AZ (One Zone) |
| Durability | 99.999999999% (eleven 9s) for Standard classes |
| OS support | Linux only (not Windows) |
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