Which RAID level uses striping with parity and tolerates a single disk failure?

Which RAID level uses striping with parity and tolerates a single disk failure?

• A. RAID 5
• B. RAID 0
• C. RAID 1
• D. RAID 2

Answer: (A)

This question is about fault tolerance using parity with striped data. In RAID 5, data and parity are distributed across all drives, so each stripe includes a parity block. The parity information is rotated among the disks, which allows the system to reconstruct any missing data if a single disk fails. As long as only one disk is down, the lost information can be rebuilt from the remaining data and the parity, keeping the array available. If two disks fail, reconstruction isn’t possible, and data is lost. This approach also offers better storage efficiency than mirroring because only one disk’s worth of capacity is used for parity across the array. RAID 0 strips data with no parity, so there’s no fault tolerance. RAID 1 uses mirroring rather than striping with parity. RAID 2 uses a different, older error-correction scheme, not the typical parity-based striping described here.

This question is about fault tolerance using parity with striped data. In RAID 5, data and parity are distributed across all drives, so each stripe includes a parity block. The parity information is rotated among the disks, which allows the system to reconstruct any missing data if a single disk fails. As long as only one disk is down, the lost information can be rebuilt from the remaining data and the parity, keeping the array available. If two disks fail, reconstruction isn’t possible, and data is lost. This approach also offers better storage efficiency than mirroring because only one disk’s worth of capacity is used for parity across the array.

RAID 0 strips data with no parity, so there’s no fault tolerance. RAID 1 uses mirroring rather than striping with parity. RAID 2 uses a different, older error-correction scheme, not the typical parity-based striping described here.