Storage Options on AWS - S3, EBS, Instance Storage & EFS

In this post, I want to talk to you about different storage options on AWS. AWS gives us following types of storage options. Let's understand quick difference between them first.

  1. EBS: Think of it like a disc of your server. It is Block-level storage and hence most suitable for very fast read and write operations at the same time. E.g. OS, databases etc. These are connected over network to the EC2 instances (like SAN). An EBS volume can be attached to only EC2 instance at a given time. 

  2. Instance Storage:This is again block level disc with your EC2 instances, but they are local on the physical host. These are non-persistent discs and hence any data on this gets lost if the instance is stopped and started. Data is not lost in case of EC2 reboot. 

  3. EFS: This is available as an equivalent of NFS. You can mount an EFS to multiple EC2 instances and use like a shared disk. This currently works only with Linux isntances and not Windows.

  4. Amazon S3: This is a highly available Object level storage. Objects (files) are accessed via their keys. This is suitable for storing files which can be accessed by an application via AWS APIs. Do not use this as a disc or mount it to EC2 instances. In following videos, you can learn about various features offered by S3 along with using S3 commands via #AWS #CLI

  5. Glacier: This is the archival service from AWS. Instead of doing archival on tapes (on-premises), you may choose to archive to Glacier. It is cheapest form of storage. A video on Glacier is coming soon. 
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