EFS Elastic File Storage

· Managed Network File system across AZ`s

Features

· NFS v4 compatible

· Multiple EC2`s can access EFS at the same time, providing common data source for workloads / applications running on more than one instance or server.

· EFS can store data and metadata across AZ`s in a region

· can grow to petabyte scale, drive high levels of throughput and allow massively parallel access to data from EC2`s

· Strong File System semantics such as data consistency and file locking

· POSIX compliant; Portable Operating System Interface

· EFS Data management can be dne via AWS Datasync - a service thatcan move data from on-premise to Cloud

· Backup data with automated incremental EFS to EFS Backup soloution

Performance Modes

· General Purpose (low latency )

· Max IO: higher levels of aggregate throughput with Tradeoff of higher latency for file operations

Throughput modes

· Bursting or Provisioned

· 10 GB+ per sec

Mount Targets

· one mount target in each AZ in a region

· mount using the EFS name which will resolve to the IP

· if using via onpremise must be using a Linux based server

Components of a file system

· ID

· creation Token

· creation Time

· FS size in bytes

· number of mount targets created by the FS

· FS state

· mount target

Data consistency

· Open after Close consistency semantics > NFS v4

· Apps that have synchronous data access and perform non appending writes will have read after write consistency for data access

Managing File Systems

· Can be encrypted / at rest and in Transit

· 4 KIB min increment size

· create /delete mount targets; Update configurations