Which RAID level provides striping with parity across multiple disks for fault tolerance and improved performance?

Which RAID level provides striping with parity across multiple disks for fault tolerance and improved performance?

• A. RAID 0
• B. RAID 5
• C. RAID 1
• D. RAID 10

Answer: (B)

Striping data across several disks with parity information lets the array tolerate a single disk failure while keeping fast reads. In this setup, data is written in stripes across the disks and parity data is distributed across them, so if one disk fails you can reconstruct its data from the remaining data and parity. Read performance improves because multiple disks service reads in parallel, while writes incur some parity calculation overhead. You need at least three disks for this arrangement, and usable capacity is the total across all disks minus the space of one disk. This combination—striping with distributed parity across multiple disks for fault tolerance and better performance—best fits the description.

Striping data across several disks with parity information lets the array tolerate a single disk failure while keeping fast reads. In this setup, data is written in stripes across the disks and parity data is distributed across them, so if one disk fails you can reconstruct its data from the remaining data and parity. Read performance improves because multiple disks service reads in parallel, while writes incur some parity calculation overhead. You need at least three disks for this arrangement, and usable capacity is the total across all disks minus the space of one disk. This combination—striping with distributed parity across multiple disks for fault tolerance and better performance—best fits the description.