TestOut LabSim A+ Certification Practice Exam

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RAID 1 provides redundancy through which method?

Striping data across multiple disks
Mirroring data on two disks
Partial data duplication on two disks
Using parity information across three disks

The correct answer is: Mirroring data on two disks

RAID 1, also known as disk mirroring, provides redundancy by creating an exact copy of data on two disks. This means that every piece of data written to the primary disk is simultaneously duplicated on a second disk. In the event of a disk failure, the system can continue to operate using the remaining functional disk, ensuring that no data is lost and that the system uptime is maintained. This approach is straightforward and offers high fault tolerance, making it a popular choice for critical data storage where reliability is paramount. Regarding the other methods mentioned: striping, which divides data across multiple disks, enhances performance but does not provide redundancy on its own. Partial data duplication does not align with how RAID 1 functions, as it aims for a complete mirror, not a subset. Using parity information across three disks is characteristic of RAID levels like RAID 5, which offer redundancy through error correction rather than simple data replication. Thus, the correct method for RAID 1 is mirroring, which ensures that both disks contain identical sets of data for enhanced protection against data loss.