Certified Information Systems Security Professional (CISSP) Practice Exam 2026 – All-in-One Guide to Mastering Your Certification!

The choice of RAID 10 for offering the highest level of data redundancy is well-founded in the way it combines the benefits of striping and mirroring. RAID 10, also known as RAID 1+0, is essentially a nested RAID configuration that first mirrors data across two or more disks (RAID 1) and then stripes data across them (RAID 0). This dual approach greatly enhances data protection.

The mirroring aspect ensures that each disk in the RAID set has an exact copy of the data, providing robust redundancy. If one disk fails, the system can continue to operate using its mirror, thereby minimizing downtime and loss risk. The striping part allows data to be spread across multiple disks, which not only improves read and write performance but also optimizes storage utilization.

In contrast, other RAID levels like RAID 5 use block-level striping with distributed parity, which does provide redundancy but can incur additional overhead during write operations due to the need to calculate and write parity data. While RAID 5 is more space-efficient, it does not match the fault tolerance of RAID 10, which can survive multiple disk failures if they are not in the same mirrored pair. RAID 4 and RAID 3 also have their own methods