text: **Read from the source Volume**
  When a user performs a read operation on the source volume, there is no redirection. The 
  operation is similar to what is done with a volume that is not part of a FlashCopy mapping. 
  
  **Write on the source Volume**
  Performing a write operation on the source volume modifies a block or a set of blocks, which 
  modifies a grain on the source. It generates one of the following actions, depending on the 
  state of the grain to be modified: 
  
  (cid:2) If the bitmap indicates that the grain was copied, the source grain is changed and the 
  target volume and the bitmap table remain unchanged, as shown in Figure 11-5. 