(ISC)2 Certified in Cybersecurity Practice Exam

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What type of RAID level provides redundancy through mirroring data on two disks?

RAID 0
RAID 1
RAID 5
RAID 10

The correct answer is: RAID 1

The correct choice provides redundancy by using a method called mirroring. In this RAID level, data is duplicated on two separate disks, which means that if one disk fails, the data is still accessible from the other disk. This approach ensures data availability and protection against hardware failures, making it a strong option for environments where data integrity is crucial. The process of mirroring in this RAID level involves writing the same data to both disks simultaneously. This not only provides redundancy but also allows for quick recovery and accessibility of data, as there is always a complete copy available. This mechanism is particularly valuable for critical systems that cannot afford any downtime or data loss. In contrast, other RAID levels have different methodologies and trade-offs related to performance, capacity, and redundancy. For example, RAID 0 focuses on striping data across disks for enhanced performance but does not offer any redundancy. RAID 5 provides redundancy using distributed parity, allowing for data recovery in case of a single disk failure but involves a more complex write process. RAID 10 combines both mirroring and striping but requires a minimum of four disks and prioritizes performance alongside redundancy.