Which storage solution provides redundancy by writing data across multiple drives for fault tolerance?

The storage solution that provides redundancy by writing data across multiple drives for fault tolerance is indeed RAID 5.

RAID 5 uses block-level striping with parity, which means that it distributes data and parity information across three or more drives. This design allows the system to continue operating normally even if one drive fails, as the lost data can be reconstructed from the remaining data and the parity information stored on the other drives. The fault tolerance of RAID 5 makes it a popular choice for environments where data availability and reliability are critical.

In contrast, RAID 0 does not provide any redundancy, as it solely focuses on performance by striping data across multiple drives without any parity or mirroring. RAID 1 offers redundancy through mirroring, where data is duplicated on two drives, but it does not offer the same efficient storage capacity as RAID 5. RAID 6 enhances RAID 5 by adding an additional layer of fault tolerance, allowing for the failure of two drives instead of one, but it requires a minimum of four drives and the complexity increases.

RAID 5 strikes a balance between performance, capacity, and fault tolerance, making it a highly effective solution for data redundancy across multiple drives.