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AWS Solutions Architect Associate (SAA-C02)
Elastic Compute Cloud (EC2)

Elastic File System (EFS)

  • AWS managed Network File System (NFS)
  • Can be mounted to multiple EC2 instances across AZs
  • Pay per use (no capacity provisioning)
  • Auto scaling (up to PBs)
  • Compatible with Linux based AMIs (POSIX file system)
  • Uses security group to control access to EFS
  • Lifecycle management feature to move files to EFS-IA after N days

Performance Mode

  • General Purpose (default)
    • latency-sensitive use cases (web server, CMS, etc.)
  • Max I/O
    • higher latency & throughput (big data, media processing)

Throughput Mode

  • Bursting (default)
    • Throughput: 50MB/s per TB
    • Burst of up to 100MB/s.
  • Provisioned
    • Fixed throughput (provisioned)

Storage Tiers

  • Standard - for frequently accessed files
  • Infrequent access (EFS-IA) - cost to retrieve files, lower price to store


  • EFS Security Groups to control network traffic
  • POSIX Permissions to control access from hosts by IAM User or Group

Last updated: 2022-05-19