Which RAID level uses mirroring to provide redundancy?

RAID 1 utilizes mirroring as its primary means of achieving redundancy. In RAID 1, data is duplicated across two or more drives. This means that every piece of data is stored on both drives, creating an exact copy. If one drive fails, the system can continue operating normally using the other drive, thereby ensuring data availability and integrity. The mirroring process allows for high data redundancy, making RAID 1 an excellent choice for environments where data protection is critical.

The other RAID options have different methods of achieving redundancy: RAID 0 does not provide redundancy at all since it only stripes data across multiple drives, leading to higher performance but increased risk of data loss. RAID 5 and RAID 6 use striping with parity rather than mirroring. While both provide redundancy through calculated parity information, they do not create identical copies of data on separate drives like RAID 1 does. This fundamental difference in approach establishes RAID 1 as the correct answer when identifying the RAID level that employs mirroring for redundancy.