Which RAID level combines mirroring and striping to provide both performance and redundancy?

• A. RAID 0.
• B. RAID 10.
• C. RAID 1.
• D. RAID 5.

Answer: (B)

Combining mirroring and striping means you duplicate data across drives for redundancy, then split that data across multiple drives to boost speed. RAID 10 does this by first creating mirrored copies of data (like RAID 1) and then stripe across those mirrors (like RAID 0). This gives both fault tolerance and higher throughput: if one drive fails in a mirror, the other copy keeps the data, and reading/writing can be spread across several disks simultaneously. It requires at least four disks since you need at least two mirrored pairs to stripe between. Other levels don’t match this combination: striping alone (RAID 0) is fast but has no redundancy; mirroring alone (RAID 1) has redundancy but no striping performance gain; parity-based RAID levels (like RAID 5) provide redundancy without mirroring, using parity data rather than duplicated blocks.