系统内冗余或重复数据的度量，表明存储和潜在性能问题效率低下。
1 PB = 1.818 CS
1 CS = 0.55 PB
例子:
将15 奇偶校验的冗余转换为校验和冗余：
15 PB = 27.273 CS
| 奇偶校验的冗余 | 校验和冗余 |
|---|---|
| 0.01 PB | 0.018 CS |
| 0.1 PB | 0.182 CS |
| 1 PB | 1.818 CS |
| 2 PB | 3.636 CS |
| 3 PB | 5.455 CS |
| 5 PB | 9.091 CS |
| 10 PB | 18.182 CS |
| 20 PB | 36.364 CS |
| 30 PB | 54.545 CS |
| 40 PB | 72.727 CS |
| 50 PB | 90.909 CS |
| 60 PB | 109.091 CS |
| 70 PB | 127.273 CS |
| 80 PB | 145.455 CS |
| 90 PB | 163.636 CS |
| 100 PB | 181.818 CS |
| 250 PB | 454.545 CS |
| 500 PB | 909.091 CS |
| 750 PB | 1,363.636 CS |
| 1000 PB | 1,818.182 CS |
| 10000 PB | 18,181.818 CS |
| 100000 PB | 181,818.182 CS |
规则