What Kind of Storage is EFS in AWS?
📌 Simple Definition
👉 Amazon EFS (Elastic File System) is a managed file storage service in AWS.
👉 It is:
- File-based storage
- Shared storage (multiple servers can use it at the same time)
- Network storage (accessed over network using NFS)
🔹 What Type of Storage?
👉 EFS is a:
✅ File Storage (Not Block / Not Object)
| Storage Type | Example | Use Case |
|---|---|---|
| File Storage | EFS ✅ | Shared files, web content |
| Block Storage | EBS | Single server disk |
| Object Storage | S3 | Images, videos, backups |
🔹 Key Features of EFS
1️⃣ Shared Storage 🧩
👉 Multiple EC2 instances can access same data
📌 Example:
- 2 web servers → same website files
2️⃣ Scalable 📈
👉 Storage automatically grows/shrinks
👉 No need to manually increase size
3️⃣ Network File System (NFS) 🌐
👉 Access using NFS protocol
👉 Mount like:
mount -t nfs4
4️⃣ High Availability 💡
👉 Works across multiple Availability Zones
5️⃣ Fully Managed ✅
👉 No server maintenance needed
🔹 Real Life Example 😎
👉 Website hosting:
- EC2-1 + EC2-2
- Both connected to EFS
👉 If you upload file in one server → automatically visible in another
🔹 When to Use EFS?
✅ Web servers (shared content)
✅ CMS (WordPress)
✅ Big data apps
✅ Dev/Test environments
🔹 When NOT to Use ❌
❌ Database storage (use RDS / EBS)
❌ High-speed low latency apps
🔹 Interview Answer 💼
👉 “Amazon EFS is a scalable, managed file storage service that allows multiple EC2 instances to access shared data using the NFS protocol.”
🔥 Easy One Line
👉 EFS = Shared network file storage for multiple servers
