Intro to EBS from SAA-C03 Notes
Amazon EBS (Elastic Block Store) - Architecture
EBS Elastic Volumes
Ref: https://www.udemy.com/course/aws-certified-machine-learning-engineer-associate-mla-c01/learn/lecture/45284791
- 🔧 Allow changing volume seamlessly, without downtime nor the need to detach volume or restart its EC2 instance!
- 💡 Kinda magic!
- Most volumes support this nowadays, enabled by default
- Just go to Actions → Modify Volume from the console
- Possible changes:
- Increase volume size
- ‼️ You can only increase, not decrease!
- Change volume type
- e.g. GP2 → GP3
- Specify desired IOPS or throughput (or it will guess)
- Adjust performance
Intro to EFS from SAA-C03 Notes
Amazon EFS (Elastic File System)
Comparing EBS vs EFS
Ref: https://www.udemy.com/course/aws-certified-machine-learning-engineer-associate-mla-c01/learn/lecture/45356679
- EBS volumes:
- Generally attached to one EC2 instance (except multi-attach io1/io2)
- Locked at the AZ level
- gp2: IO increases if disk size increases
- gp3 & io1: can increase IO independently
- Migrating EBS volume across AZ requires taking & restoring snapshot
- EBS snapshots use IO → don't run them while app is handling a lot of traffic
- Root EBS volumes of EC2 instances get terminated by default if instance gets terminated
- EBS Diagram
- EFS file systems:
- Can be mounted in 100s of EC2 instances across AZs
- With EFS, EC2 instances can share website files (e.g. WordPress)
- Only for Linux Instances (POSIX)!
- Can leverage Storage Tiers for cost savings
- Generally more expensive than EBS
- EFS Diagram