text: **Cleaning Rate**
  The data rate at which data is copied from the target of the mapping being stopped to the next 
  oldest target is determined by the*cleaning rate*. This property of the FlashCopy mapping and 
  can be changed dynamically. It is measured like the copyrate property, but both properties are 
  independent. Table 11-5 lists the relationship of the cleaning rate values to the attempted 
  number of grains to be split per second. 