<aside> <img src="/icons/wrench_gray.svg" alt="/icons/wrench_gray.svg" width="40px" /> Data redundancy refers to the practice of keeping data in two or more places within a database or data storage system. Data redundancy ensures an organization can provide continued operations or services in the event something happens to its data — for example, in the case of data corruption or data loss.

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RAID (Redundant Arrays of Independent Disks)

RAID (Redundant Arrays of Independent Disks) is a technique that makes use of a combination of multiple disks for storing the data instead of using a single disk for increased performance, data redundancy, or to protect data in the case of a drive failure.

RAID 0

• Provides data striping across multiple disks
• Used for improved performance but offers no data redundancy
• Multiple drives increase read and write speeds
• Suitable for scenarios where performance is essential, and data redundancy is not a concern

RAID 1

• Provides redundancy by mirroring data identically on two storage devices
• Ensures data integrity and availability
• Suitable for critical applications and maintains a complete copy of data on both devices
• Only one storage device can fail without data loss or downtime

RAID 5

• Utilizes striping with parity across at least three storage devices
• Offers fault tolerance by distributing and parity
• Can continue operations if one storage device fails
• Data reconstruction is possible but results in slower access speeds

RAID 6

• Similar to RAID 5 but includes double parity data