(ISC)2 Certified In Cybersecurity Practice Exam

RAID 1 is characterized by disk mirroring, which means that data is copied identically onto two or more disks. This configuration provides a level of redundancy, ensuring that if one disk fails, the information remains accessible from the other mirrored disk. The primary benefit of RAID 1 is its ability to provide high availability and increased fault tolerance, which is crucial for systems that require constant uptime and data integrity. In RAID 1, the performance for read operations can improve since data can be read simultaneously from multiple disks. However, the write performance may be slightly slower compared to other RAID levels due to the need to write the same data to multiple disks. In contrast, RAID 0 focuses on striping data across multiple disks for improved performance and does not offer redundancy, making it unsuitable for environments where data loss is a concern. RAID 4 and RAID 5 use a different structure by implementing striping along with parity data to provide fault tolerance; however, they do not utilize mirroring like RAID 1 does. Thus, RAID 1 is the only configuration among the options that specifically implements disk mirroring as a method of ensuring data redundancy.