AWS EFS Explained: Shared File Storage for Multiple EC2 Instances

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Amazon Elastic File System (EFS) is a fully managed, serverless shared file system that allows multiple EC2 instances across different Availability Zones to read and write data simultaneously using the NFS 4.1 protocol. Unlike EBS, which is tied to a single EC2 instance and a single AZ, EFS automatically scales from kilobytes to petabytes and replicates data across multiple AZs within a region. Access is enabled through Mount Targets — Elastic Network Interfaces provisioned in each AZ — which serve as the connection point between EC2 instances and the file system. EFS follows a pay-as-you-go pricing model, billing only for storage actually used rather than pre-provisioned capacity. It is commonly used for shared content, CMS workloads, and machine learning training datasets where concurrent multi-instance access is required.

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ProgrammingDEV Community ·

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