Amazon Elastic Block Store - Notes - 03 - EBS and Instance Store

AWS > Storage > Amazon Elastic Block Store (EBS):

Select the AMI based on:
1. Region and AZ
2. Operating System (Linux or Windows)
3. Architecture (32-bit or 64-bit)
4. Launch Permissions
5. Storage for the root device (root device volume)
    5A. Instance Store (Ephemeral Storage)
    5B. EBS Backed Volumes

EBS vs Instance Store
1. All AMIs are categorized as either backed by EBS or Instance Store.
2. For EBS Volumes - The root device for an instance launched from the AMI is an EBS Volumes created from EBS snapshot.
3. For Instance Store Volumes - The root device for an instance launched from the AMI is an Instance Store Volume created from a template stored in S3.
4. Instance Store Volumes are sometimes called Ephemeral Storage.
5. Instance Store Volumes cannot be stopped. If the underlying host fails, you will lose your data.
6. EBS backed instance can be stopped. You will not lose the date on this instance if it is stopped.
7. You can reboot both, you will not lose data.
8. By defaultm both Root Volumes will delete on termination, however with EBS Volumes, you can tell AWS to keep the root device volume.


Reference:
1. AWS Documentation - Storage:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Storage.html

2. Udemy - AWS Solutions Architect - Associate:
https://www.udemy.com/aws-certified-solutions-architect-associate/


最初發表 / 最後更新: 2019.03.25 / 2020.06.09