Why it matters

EFS enables shared file storage. Understanding shapes AWS multi-instance apps.

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The architecture

Mount targets in each AZ for cross-AZ access.

Performance modes: general purpose, max IO. Throughput modes: bursting, provisioned, elastic.

EFS structureMount targetsper AZPerformance modegeneral or max IOThroughput modeelastic defaultElastic throughput is default now; auto-scales without provisioning
EFS features.
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How it works end to end

Storage classes: standard + infrequent access (IA). Lifecycle policies auto-transition.

Encryption: at rest + in transit.

POSIX-compliant.

Backup: AWS Backup integrated.