What is RAID-DP and how many disks can fail in the same RAID group?

• A. RAID-DP provides single-parity protection and can tolerate one disk failure.
• B. RAID-DP provides double-parity protection and can tolerate two disk failures in the same RAID group.
• C. RAID-DP provides triple parity protection and can tolerate three disk failures.
• D. RAID-DP provides no parity and relies on mirroring.

Answer: (C)

RAID-DP uses two independent parity blocks to protect data across the disks, allowing recovery if up to two disks fail in the same RAID group. This is effectively RAID-6 style protection: the two parity computations let the system reconstruct data from the remaining disks when two disks are lost. It is not single-parity protection (which would tolerate only one failure), nor triple parity, nor a no-parity mirroring setup. So RAID-DP provides double parity protection and can tolerate two disk failures in the same RAID group. (In practice, you typically need at least four disks to realize this protection.)