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
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
- No redundancy
- If one disk fails → all data is lost
- High-speed storage where data is not critical
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
- Only 50% usable storage
- Slightly higher cost
- Servers
- Import