070 EBS vs EFS

EBS

• one instance
• locked at AZ level
• gp2: IO increases when disk size increases
• gp3/io1: can increase IO independently

To migrate an EBS across AZ

• Take a snapshot
• Restore snapshot to another AZ
• EBS backup uses IO and you shouldn’t run it while your app is using it

Root EBS will get terminated with EC2 instance by default (you can disable that)

EFS

• Mount 100s of instances across AZ in region
• Only for Linux instances

EBS vs EFS

Price point: EBS < EFS

EFS has storage tiers

Remember EBS vs EFS vs Instance Store

• Instance Store is physically attached to EC2 and when EC2 stops it will be lost.