Which of the following RAID levels will you use to implement a RAID system for providing fault tolerance to a database?

RAID 10 combines mirroring and striping and does provide fault tolerance, but it requires a minimum of four drives and is a more complex solution than the basic fault tolerance scenario described.

RAID 1 mirrors data across two drives so that if one drive fails, the other contains an exact copy and the system continues to operate without data loss. For databases, RAID 1 is preferred over RAID 5 because it avoids the write penalty associated with parity calculation, making it more suitable for write-intensive database workloads.

RAID 5 uses distributed parity and can tolerate one drive failure, but its parity calculation introduces a significant write penalty that degrades database write performance.

RAID 0 provides only striping for improved performance and offers no fault tolerance - a single drive failure results in complete data loss.