Which RAID configuration provides redundancy through mirroring?

The configuration that provides redundancy through mirroring is RAID 1. In RAID 1, data is duplicated on two or more disks, which means that every piece of data written to one disk is also written to another. This mirroring process ensures that if one disk fails, the data remains accessible from the other disk(s), thereby providing a high level of data redundancy and reliability.

RAID 1 is particularly beneficial for critical systems or websites where data availability is essential, as it offers a straightforward approach to redundancy without any complex striping or parity calculations seen in other RAID configurations. This simplicity leads to increased data safety, although it does come at the cost of halving the total usable storage capacity since each piece of data is stored twice.

Other RAID configurations have different approaches to data redundancy and performance. For example, RAID 0 focuses on performance by striping data across multiple disks but offers no redundancy, making it vulnerable to total data loss if any one disk fails. RAID 5 strikes a balance between performance and redundancy through striping with parity, utilizing one disk worth of capacity for parity information, but it does not provide the same level of redundancy through mirroring as RAID 1. RAID 10, which is a combination of RAID 1