text: Figure 11-15 Thin-provisioned target volume 
  
  **Source and target thin-provisioned**
  When the source and target volumes are thin-provisioned, only the data that is allocated to 
  the source is copied to the target. In this configuration, the background copy option has no 
  effect. 
  
  **Performance:**The best performance is obtained when the grain size of the 
  thin-provisioned volume is the same as the grain size of the FlashCopy mapping. 
  
  **Thin-provisioned incremental FlashCopy**
  The implementation of thin-provisioned volumes does not preclude the use of incremental 
  FlashCopy on the same volumes. It does not make sense to have a fully allocated source 
  volume and then use incremental FlashCopy (which is always a full copy the first time) to copy 
  this fully allocated source volume to a thin-provisioned target volume. However, this action is 
  not prohibited. 
  
  Consider the following optional configurations: 
  
  (cid:2) A thin-provisioned source volume can be copied incrementally by using FlashCopy to a 
  
  thin-provisioned target volume. Whenever the FlashCopy is performed, only data that was 
  modified is recopied to the target. If space is allocated on the target because of I/O to the 
  target volume, this space is not reclaimed with subsequent FlashCopy operations. 
  
  (cid:2) A fully allocated source volume can be copied incrementally by using FlashCopy to 
  another fully allocated volume at the same time as it is being copied to multiple 
  thin-provisioned targets (taken at separate points in time). By using this combination, a 
  single full backup can be kept for recovery purposes, and the backup workload is 
  separated from the production workload. At the same time, older thin-provisioned backups 
  can be retained. 