Which description best fits RAID 1?

RAID 1 is best described by the concept of mirroring. In a RAID 1 configuration, data is duplicated across two or more disks, meaning that an exact copy of the data is written to each disk in the array. This mirroring process ensures that if one disk fails, the data is still available on the other disk(s). This redundancy not only provides data protection but also enhances read speed, as data can be read from multiple disks simultaneously.

The focus on mirroring distinguishes RAID 1 from other RAID levels such as striping, which distributes data across multiple disks without redundancy. While striping increases performance, it does not offer the fault tolerance found in mirroring. Additionally, RAID configurations that involve striping with parity or striping with mirroring combine different features and do not directly represent the straightforward duplicative nature of RAID 1.

In summary, RAID 1’s defining feature is its mirroring capability, which provides an effective balance of redundancy and performance for data storage.