Ebs Vs S3 in AWS
Here's a crystal-clear comparison between Amazon EBS (Elastic Block Store) and Amazon S3 (Simple Storage Service) — two of AWS's most widely used storage services:
? Amazon EBS vs Amazon S3
| Feature | Amazon EBS ? (Block Storage) | Amazon S3 ? (Object Storage) |
|---|---|---|
| Type | Block-level storage | Object-based storage |
| Use Case | Attached to EC2 like a hard disk | Store and retrieve any amount of data from anywhere |
| Access | Through EC2 instances only | Accessible over the internet using HTTPS APIs |
| Persistence | Persistent until deleted | Persistent and highly durable |
| Durability | High (replicated in one AZ) | 11 9’s durability (99.999999999%) across multiple AZs |
| Availability Zone | Bound to a single AZ | Region-wide and globally accessible |
| Latency | Very low latency (used like a hard drive) | Higher latency (designed for availability & durability) |
| Scalability | Predefined size (up to 64 TiB per volume) | Virtually unlimited storage |
| Snapshots | Manual or scheduled to S3 | Versioning and lifecycle policies built-in |
| Cost | Pay for provisioned size (GiB/month) | Pay only for what you store (per GB) |
| File System | Needs formatting and mounting | No file system; stores files as objects |
| Data Type | Blocks (like virtual drives) | Files/Objects (like photos, logs, backups) |
| Performance | High IOPS, good for DBs, OSs | Optimized for throughput, not IOPS |
| Data Retrieval | Instant (like a disk) | Varies by storage class (Standard, Glacier) |
| Security | Encrypted via KMS, IAM control | Encrypted, versioned, bucket policies, IAM, ACL |
? Best Use Cases
? EBS (Elastic Block Store)
Boot volumes for EC2 instances
Databases (SQL/NoSQL)
Applications that need block storage
File systems requiring frequent read/write
? S3 (Simple Storage Service)
Backups and archives
Hosting static websites
Media storage (videos, images)
Big data and analytics input
Logs and object-based data stores
? Analogy
| Service | Analogy |
|---|---|
| EBS | Like a hard drive or SSD attached to your computer. |
| S3 | Like a cloud file cabinet where you drop and fetch files easily. |
? Summary Table
| Criteria | EBS | S3 |
|---|---|---|
| Attach to EC2 | ? Required | ? Not needed |
| Shared Access | ? No (single EC2 per volume) | ? Yes (multi-user, global access) |
| File Uploads | ? Not direct (use EC2 FS) | ? Direct upload |
| Backup Target | ? Can backup to S3 | ? Backup-ready |
| Max Size | 64 TiB per volume | Unlimited |
| Storage Classes | Single-tier per volume | Multiple (Standard, IA, Glacier etc.) |
? When to Choose What?
Use EBS if:
You need low-latency disk-like performance
You're running a database, file system, or OS
Use S3 if:
You need scalable, cost-effective storage for files
You want to store backups, logs, images, or data archives
