A company's project team needs to simultaneously mount a file system on multiple Amazon EC2 Linux instances. The file system also will be shared across multiple Availability Zones.
EBS is a high-performance per-instance block storage system designed to act as storage for a single EC2 instance (most of the time)
EFS is a highly scalable file storage system designed to provide flexible storage for multiple EC2 instances
S3 is an object storage system, designed to provide archiving and data control options and to interface with other services beyond EC2. It’s also useful for storing static html pages and shared storage for applications
A. Amazon Elastic File System (Amazon EFS)
Amazon Elastic File System (Amazon EFS) is a fully managed file storage service that allows you to create and mount a file system on multiple Amazon EC2 Linux instances simultaneously. It also allows you to share the file system across multiple Availability Zones, making it ideal for applications that need to maintain high availability.
B. Amazon S3: Amazon S3 is a fully managed object storage service that is designed to store and retrieve large amounts of data. It is not a file system and cannot be mounted on multiple instances simultaneously.
C. Amazon Elastic Block Store (Amazon EBS): Amazon Elastic Block Store (Amazon EBS) is a block-level storage service that provides persistent storage for Amazon EC2 instances. It is not a file system and can only be attached to one EC2 instance at a time.
D. Amazon FSx for Windows File Server: Amazon FSx for Windows File Server is a fully managed native Microsoft Windows file system that is built on Windows Server. Cannot be mounted on Linux instances.
Amazon EFS provides a simple, serverless, set-and-forget elastic file system. With Amazon EFS, you can create a file system, mount the file system on an Amazon EC2 instance, and then read and write data to and from your file system.
Ref link: https://docs.aws.amazon.com/efs/latest/ug/how-it-works.html
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