EFS Elastic filesystem

  • Can be attached to multiple ec2 instances at once
  • Scales automatically on size of storage
  • Supports NFSv4
  • Works only within a Region and multiple AZs in the Region
  • Multi-AZ replication
  • Read after write consistency
  • Can be mounted from on-premises (unsecure without tunnels)
    • Or se AWS Datasync in on-prem infra to sync data to EFS
  • Preserves ownership and permissions from OS
  • You pay for what the size you currently use
  • Multiple EFS’ can be in sync with with AWS DataSync


  • 3x times more expensive than EBS
  • 20x times more expensive than S3