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 BR = 0.9 PB
1 PB = 1.111 BR
例子:
将15 块冗余转换为奇偶校验的冗余：
15 BR = 13.5 PB
| 块冗余 | 奇偶校验的冗余 |
|---|---|
| 0.01 BR | 0.009 PB |
| 0.1 BR | 0.09 PB |
| 1 BR | 0.9 PB |
| 2 BR | 1.8 PB |
| 3 BR | 2.7 PB |
| 5 BR | 4.5 PB |
| 10 BR | 9 PB |
| 20 BR | 18 PB |
| 30 BR | 27 PB |
| 40 BR | 36 PB |
| 50 BR | 45 PB |
| 60 BR | 54 PB |
| 70 BR | 63 PB |
| 80 BR | 72 PB |
| 90 BR | 81 PB |
| 100 BR | 90 PB |
| 250 BR | 225 PB |
| 500 BR | 450 PB |
| 750 BR | 675 PB |
| 1000 BR | 900 PB |
| 10000 BR | 9,000 PB |
| 100000 BR | 90,000 PB |
规则