When you launch an application on Amazon EC2, you need storage for the operating sy
stem, applications, databases, and other files. Amazon Elastic Block Store (AWS EBS) provides persistent block storage that can be attached to EC2 instances.
What Is AWS EBS?
Amazon EBS is a block storage service designed primarily for use with Amazon EC2. Think of a
n EBS volume as a virtual hard drive that you can attach to your cloud server.
Unlike temporary instance storage, an EBS volume is persistent. You can stop an EC2 instance and keep the data stored on its EBS volumes.
How Does EBS Work?
The basic setup is straightforward:
EC2 Instance → EBS Volume → Data
For example, you might use one EBS volume for the operating system and another for application or database data. The volumes can be managed independently from the EC2 instance.
Common EBS Volume Types
AWS provides different EBS volume types for different workloads:
- gp3 – General-purpose SSD storage suitable for most applications.
- gp2 – Older general-purpose SSD volume type.
- io2 – Designed for applications requiring high IOPS and consistent performance.
- st1 – HDD-based storage suitable for throughput-intensive workloads.
- sc1 – Lower-cost HDD storage for infrequently accessed workloads.
For many modern applications, gp3 is a practical starting point because it provides flexible performance and general-purpose SSD storage.
What Are EBS Snapshots?
EBS snapshots are point-in-time backups of EBS volumes. They are useful for backup, disaster recovery, and creating new volumes from existing data.
For example, before making a major change to a production server, you can create an EBS snapshot so that you have a recovery point if something goes wrong.
AWS EBS vs S3
EBS and S3 are both AWS storage services, but they solve different problems.
- EBS provides block storage for applications and EC2 servers.
- S3 provides object storage for files, backups, media, logs, and other objects.
A typical application might use EBS for the server's disk storage and S3 for files and backups.
Why Is EBS Important?
EBS makes it easier to manage storage independently from your EC2 compute resources. You can create volumes, attach them to instances, take snapshots, and select storage based on your application's performance and cost needs.
For developers working with AWS, understanding EBS is important because storage performance can directly affect application performance.
Final Thoughts
AWS EBS is the persistent block storage layer commonly used with Amazon EC2. Whether you're hosting a web application, database, or business system, choosing the right EBS volume and maintaining reliable snapshots can help keep your workloads stable and recoverable.
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