In RAID 5 and RAID 6, how does parity contribute to data protection?

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Multiple Choice

In RAID 5 and RAID 6, how does parity contribute to data protection?

Explanation:
Parity provides redundancy so missing data can be rebuilt from the surviving pieces. In RAID 5, parity is single and distributed across all drives. For each stripe, one parity block is created from the XOR of the data blocks, and that parity sits on one of the drives in the array in a rotating way. If any single drive fails, you can reconstruct its data by using the remaining data blocks plus the parity. Because the parity is spread out, there isn’t a single bottleneck disk. In RAID 6, there are two independent parity calculations, so two parity blocks (often called P and Q) are stored across the drives. This dual-parity setup lets you recover from two simultaneous drive failures, since the two parities together with the surviving data provide enough information to rebuild the missing data. So the protection model is: RAID 5 uses single parity, tolerating one drive failure; RAID 6 uses double parity, tolerating two drive failures.

Parity provides redundancy so missing data can be rebuilt from the surviving pieces. In RAID 5, parity is single and distributed across all drives. For each stripe, one parity block is created from the XOR of the data blocks, and that parity sits on one of the drives in the array in a rotating way. If any single drive fails, you can reconstruct its data by using the remaining data blocks plus the parity. Because the parity is spread out, there isn’t a single bottleneck disk.

In RAID 6, there are two independent parity calculations, so two parity blocks (often called P and Q) are stored across the drives. This dual-parity setup lets you recover from two simultaneous drive failures, since the two parities together with the surviving data provide enough information to rebuild the missing data.

So the protection model is: RAID 5 uses single parity, tolerating one drive failure; RAID 6 uses double parity, tolerating two drive failures.

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