RAID Level 6¶
P + Q Redundancy Scheme¶
Similar to level 5, but instead stores two correction blocks \((P, Q)\). This protects from multiple simultaneous disk failures.
| D1 | D2 | D3 | D4 |
|---|---|---|---|
| P0 | 0 | 1 | P1 |
| P2 | P3 | 2 | 3 |
| 4 | P4 | P5 | 5 |
| 6 | 7 | P6 | P7 |
This increases the single parity block to guard against multiple disk failures. It gives better reliability than RAID 5