Simple Guide: What’s the Difference Between EBS and EFS in AWS?

When you create a server (instance) in AWS, you need to decide what type of storage to use. Think of it like choosing between a personal hard drive (EBS) and a shared network drive (EFS). Let’s break down both options in simple terms.

EBS (Elastic Block Storage) - The Personal Hard Drive

• One server only: Like your laptop’s hard drive, EBS can only connect to one server at a time
• Location matters: It can only be used by servers in the same area (what AWS calls an “Availability Zone”)
• Moving is tricky: If you want to move your EBS to a different area:
  • You need to take a “snapshot” (like a backup)
  • Restore it in the new location
  • Your server needs to be turned off during this process
• Cost-effective: Generally cheaper than EFS
• Works with all types: Can be used with both Windows and Linux servers

[Simple EBS Diagram]

┌──────────┐
│  Server  │────► EBS Volume
└──────────┘      (Can only attach
                   to one server)

EFS (Elastic File Storage) - The Shared Network Drive

• Share with everyone: Multiple servers can use the same EFS at the same time
• Location flexible: Works across different areas in AWS
• Great for sharing: Perfect for website files that need to be shared across multiple servers
• More expensive: Costs more than EBS but offers more flexibility
• Linux only: Only works with Linux servers, not Windows

[Simple EFS Diagram]

┌──────────┐
│ Server 1 │──┐
└──────────┘  │
              ├────► EFS Storage
┌──────────┐  │     (Can be used by
│ Server 2 │──┘     multiple servers)
└──────────┘

When Should You Use Each One?

Use EBS when:

• You have just one server
• You don’t need to share files between servers
• You want to save money
• You’re using Windows

Use EFS when:

• You need multiple servers to access the same files
• You’re running a website across multiple servers
• You need to share files between different areas
• You’re only using Linux servers

Real-World Example

Imagine you’re setting up a photo storage system:

• EBS is like having a personal photo album that only you can access
• EFS is like having a shared family photo album that everyone can access and update at the same time

Cost Tip

Start with EBS if you’re unsure - it’s cheaper and simpler. You can always switch to EFS later if you need to share files between multiple servers.

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I hope this simple explanation helps you understand the difference between EBS and EFS! Remember, there’s no wrong choice - it all depends on what you’re trying to do.