Elastic File System (EFS)

EFS Architecture

• AWS managed implementation of NFS which allows for the creation of shared filesystems
• shared between many EC2 instances
• private service
• made available via mount targets inside a VPC
• mount targets : exist in subnets with an IP from it
• should put mount target in every AZ a VPC uses for high availability
• EC2 instances connect to the mount target to access EFS
• can be accessed from on-premises : VPN or DX
• Linux Only
• Performance modes
• General Purpose : default for 99.9% of use cases
• Max I/O : for anything that is highly parallel
• Throughput Modes
• Bursting
  • throughput scales with size of the file system
• Provisioned
  • specify throughput requirements separate from the amount of data being stored
• Storage classes
• Standard
  • default, frequently accessed data
• Infrequent Access
  • to save money for anything not used a lot
• Lifecycle policies can be used with classes