Which RAID configuration requires at least 3 disks?

Which RAID configuration requires at least 3 disks?

• A. RAID 0
• B. RAID 1
• C. RAID 5
• D. RAID 6

Answer: (C)

RAID 5 requires at least three disks, and this is a fundamental aspect of its design. In a RAID 5 configuration, data is distributed across all the disks in the array, along with parity information that is also spread across the disks. This parity allows for the recovery of data in the event of a single disk failure. The minimum of three disks is necessary to achieve both data storage and the redundancy provided by the parity, ensuring that if one disk fails, the system can continue to operate and the lost data can be reconstructed using the remaining disks and their parity information. This structure enhances performance for read operations and provides a level of fault tolerance, making it a popular choice for environments where both efficiency and data protection are important. In contrast, other RAID types either require fewer disks (like RAID 0 with just two for striping without redundancy or RAID 1 requiring only two for mirroring) or more (like RAID 6, which requires a minimum of four disks to maintain dual parity for higher fault tolerance). Thus, the requirement of three disks is intrinsic to the functionality and reliability goals of the RAID 5 setup.

RAID 5 requires at least three disks, and this is a fundamental aspect of its design. In a RAID 5 configuration, data is distributed across all the disks in the array, along with parity information that is also spread across the disks. This parity allows for the recovery of data in the event of a single disk failure. The minimum of three disks is necessary to achieve both data storage and the redundancy provided by the parity, ensuring that if one disk fails, the system can continue to operate and the lost data can be reconstructed using the remaining disks and their parity information.

This structure enhances performance for read operations and provides a level of fault tolerance, making it a popular choice for environments where both efficiency and data protection are important. In contrast, other RAID types either require fewer disks (like RAID 0 with just two for striping without redundancy or RAID 1 requiring only two for mirroring) or more (like RAID 6, which requires a minimum of four disks to maintain dual parity for higher fault tolerance). Thus, the requirement of three disks is intrinsic to the functionality and reliability goals of the RAID 5 setup.