Which RAID setup provides mirroring and redundancy?

The correct answer is associated with RAID 1, which provides both mirroring and redundancy of data. In RAID 1, data is written identically to two or more drives. This means that if one drive fails, the data remains accessible on the other drive, ensuring that there is no data loss. The mirroring feature is crucial for maintaining data integrity and availability in the event of a hardware failure.

RAID 1 is often employed in environments where data reliability is paramount. It allows for quick recovery, as the failed drive can be replaced, and the array will still function perfectly using the remaining drive(s) until repairs are made.

The other RAID configurations do have their advantages, but they do not match RAID 1's mirroring functionality. RAID 0 offers improved performance through striping but does not provide redundancy, meaning that if one drive fails, all data is lost. RAID 5 uses striping with parity for redundancy, requiring a minimum of three disks; however, it does not create exact copies of data like RAID 1. RAID 10 combines features of both RAID 1 and RAID 0, providing both striping and mirroring, but the simplest setup that solely offers mirroring and redundancy is RAID 1.