TUX.RE Forum

What Is RAID? (RAID 0, 1, 5, 10 Explained)

RAID stands for Redundant Array of Independent Disks. It is a method of combining multiple hard drives or SSDs into one system to improve performance, redundancy, or both.

RAID is commonly used in servers, storage systems, and professional environments.

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1. Why Use RAID?

RAID can provide:

• Better performance
• Data redundancy (protection against disk failure)
• Larger combined storage

However:

Important: RAID is not a backup.

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2. RAID 0 (Striping)

RAID 0 splits data across multiple disks.

Advantages:

• Very high performance
• Full capacity of all disks is usable

Disadvantages:

• No redundancy
• If one disk fails → all data is lost

Use case:

• High-speed storage where data is not critical

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3. RAID 1 (Mirroring)

RAID 1 copies the same data to two disks.

Advantages:

• High data safety
• Simple setup
• One disk can fail without data loss

Disadvantages:

• Only 50% usable storage
• Slightly higher cost

Use case:

• Servers
• Import

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