Amazon Elastic File System
User Guide

EFS Storage Classes

Amazon EFS file systems have two storage classes available:

  • Infrequent Access – The Infrequent Access (IA) storage class is a lower-cost storage class that's designed for storing long-lived, infrequently accessed files cost-effectively.

  • Standard – The Standard storage class is used to store frequently accessed files.

The EFS IA storage class reduces storage costs for files that are not accessed every day, without sacrificing the high availability, high durability, elasticity, or POSIX file system access that EFS provides. We recommend EFS IA storage if you need your full dataset to be readily accessible and want to automatically save on storage costs as your files become less frequently accessed. Examples include keeping files accessible to satisfy audit requirements, performing historical analysis, or performing backup and recovery.

EFS IA storage is compatible with all EFS features, and is available in all AWS Regions where Amazon EFS is available.

EFS IA billing is based on the amount of data stored in IA and the data I/O used to access the data stored in IA. You incur access charges when files in IA storage are read, and when files are transitioned to IA storage from Standard storage. For more information about metering IA storage for EFS file systems, see Metering an Amazon EFS File System. For storage pricing information, see Amazon EFS Pricing.

First-byte latency when reading from or writing to the IA storage class is higher than that for the Standard storage class. For file systems using Bursting Throughput, the allowed throughput is determined based on the amount of the data stored in the Standard storage class only. For file systems using Provisioned Throughput mode, you're billed for the throughput provisioned above what you are provided based on data you have stored in Standard storage class. For more information on EFS performance, see Throughput Modes.

Using Storage Classes

You move data into IA by enabling the EFS Lifecycle Management feature. When enabled, lifecycle management automates moving files from Standard storage to IA storage. To learn more, see EFS Lifecycle Management.

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