You need to configure a software RAID setting that will provide complete redundancy with minimum overhead if a disk failed. Which of these RAID types would be the best choice?
A) RAID 0
B) RAID 1
C) RAID 2
D) RAID 5
E) Maybe you need a backup for your backup
The answer: B) RAID 1
RAID 1 provides an exact duplicate of data across drives. If a disk fails, the identical data is retrieved from the remaining drives. RAID 0 provides no redundancy, and other RAID types require the recalculation of data based on a checksum. For software-based RAID, this calculation can add overhead to the operating system operations. For hardware-based RAID, the checksum calculations and rebuilding of data is usually handled in hardware with limited impact to normal operations.
 |
Want to know more? Watch “RAID.” RAID arrays are common ways to provide high-throughput and redundancy for groups of hard drives. In this module, you’ll learn how the different RAID technologies can be used to build large-scale storage infrastructures. You’ll also learn the advantages and disadvantages of the different RAID technologies and how hardware and software RAID compares. |