TestOut LabSim A+ Certification Practice Exam

If a RAID 0 volume uses Disk 1 and Disk 2, and a RAID 1 volume uses Disk 2 and Disk 3, what occurs if Disk 2 fails?

1. All data is accessible from both volumes

2. Data on the RAID 0 volume is accessible; data on the RAID 1 volume is not

3. Data on the RAID I volume is accessible; data on the RAID 0 volume is not

4. Data from both volumes is lost

The correct answer is: Data on the RAID I volume is accessible; data on the RAID 0 volume is not

In a RAID 0 configuration, data is striped across multiple drives, meaning that pieces of data are spread out across both Disk 1 and Disk 2. This provides improved performance but offers no redundancy; if any one of the disks fails, all data on the RAID 0 volume is lost. In a RAID 1 configuration, data is mirrored between two drives. In this scenario, Disk 2 and Disk 3 hold identical copies of the data. If Disk 2 fails, the RAID 1 configuration will still have an operational copy of the data on Disk 3, allowing continued access to the data stored there. Therefore, if Disk 2 fails, the RAID 1 volume will still be operational, allowing access to the data from Disk 3. However, since RAID 0 relies on both disks to retrieve the data, the failure of Disk 2 will result in the complete loss of access to the data on that volume. Thus, the RAID 0 volume will not be accessible, but the RAID 1 volume will remain accessible due to the mirroring on Disk 3. This is why the option indicating that the RAID 1 volume data is accessible while the RAID 0 volume data is not is correct.