Efs

Basics

• Elastic File System is a network file system that can be used with Linux based EC2 instances
• EFS is an AWS implementation of NFSv4. It uses POSIX permissions
• EFS filesystem can be mounted on multiple EC2 instances thus the data can be shared between them
• EFS is a private service i.e. by default it is restricted to the VPC it is provisioned into
• EFS is accessed through mount targets. Mount targets have ip addresses from the ip address range of the subnet
• For high availability, mount targets need to be provisioned in multiple AZs i.e. in each subnet of a VPC
• EFS can be accessed outside the vpc using vpc peering, VPN connection or AWS Direct Connect
• EFS offers 2 performance modes - General Purpose(default) & Max I/O
• EFS has 2 throughput modes - Bursting(default) & Provisioned
• EFS has 2 storage classes - Standard(default) & Infrequent Access. Life cycle policies can be used to move between classes