[AWS Architect] (36) Elastic File System (EFS)

Elastic File System (EFS) is a scalable managed service that implements the Network File System (NFSv4).

  • File systems can be mounted on multiple Linux instances at the same time. -> shared media, home folder, shared documents.
  • It can be accessed in the VPC, across the VPC, and even from outside of VPC through Direct Connect.
  • EFS is built to scale while maintaining low latency and high throughput. It can support thousands of current NFS connections.
  • EFS is a regional service that stores data across multiple AZs for high availability and durability.
  • EFS supports Read after Write consistency.

How to configure EFS

  • Select VPC -> Create mount targets in AZs with a security group
  • Security Group is used to control access NFS mount targets.
  • Mount targets sit inside a subnet.

Performance Mode

  • General Purpose: a default and fits for most of cases
  • Max I/O: when a large number of instances need to access a file system

Throughput Mode

  • Bursting throughput: linked to the size of data stored within the EFS.
  • Provisioned throughput: independent of size

Storage Classes

  • EFS supports 2 storage Classes: Standard and Infrequent Access (IA)
  • Lifecycle move files between classes.

Moving Files to EFS IA

  1. Create a file system
  2. Choose Lifecycle Management file access policy (7, 14, 30, 60, or 90 days)
  3. Files not accessed according to the age-off policy are moved to EFS IA
https://aws.amazon.com/efs/features/infrequent-access/

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