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 RR = 0.5 PB
1 PB = 2 RR
例子:
将15 冗余比率转换为奇偶校验的冗余：
15 RR = 7.5 PB
| 冗余比率 | 奇偶校验的冗余 |
|---|---|
| 0.01 RR | 0.005 PB |
| 0.1 RR | 0.05 PB |
| 1 RR | 0.5 PB |
| 2 RR | 1 PB |
| 3 RR | 1.5 PB |
| 5 RR | 2.5 PB |
| 10 RR | 5 PB |
| 20 RR | 10 PB |
| 30 RR | 15 PB |
| 40 RR | 20 PB |
| 50 RR | 25 PB |
| 60 RR | 30 PB |
| 70 RR | 35 PB |
| 80 RR | 40 PB |
| 90 RR | 45 PB |
| 100 RR | 50 PB |
| 250 RR | 125 PB |
| 500 RR | 250 PB |
| 750 RR | 375 PB |
| 1000 RR | 500 PB |
| 10000 RR | 5,000 PB |
| 100000 RR | 50,000 PB |
规则