In RAID level 1, what technique is primarily used?

In RAID level 1, the primary technique used is mirroring. This approach involves creating an exact duplicate of the data on one disk onto another disk. The primary advantage of this method is that it provides high data redundancy and reliability. If one disk fails, the system can continue to operate using the duplicated data on the other disk without data loss.

This mirroring process means that every write operation is performed on both disks, ensuring that both contain the same data at all times. This not only enhances data protection but also can improve read performance since data can be read from both disks simultaneously, although the write performance may be slower compared to other RAID levels due to the need to write to both disks.

While other RAID levels utilize techniques such as striping, interleave parity, or Hamming code parity for error correction, RAID level 1’s focus on duplication makes it unique in providing straightforward and effective data redundancy through mirroring.