text: In addition to the restore option, which copies the original blocks from the target volume to 
  modified blocks on the source volume, the target can be used to perform a restore of 
  individual files. To do that, you need to make the target available on a host. Is suggested to do 
  not make the target available to the source host because seeing duplicates of disks causes 
  problems for most host operating systems. Copy the files to the source by using normal host 
  data copy methods for your environment. 
  
  For more information about how to use reverse FlashCopy, see 11.1.12, “Reverse FlashCopy” 
  on page 457. 
  
  **Moving and migrating data with FlashCopy**
  FlashCopy can be used to facilitate the movement or migration of data between hosts while 
  minimizing downtime for applications. By using FlashCopy, application data can be copied 
  from source volumes to new target volumes while applications remain online. After the 
  volumes are fully copied and synchronized, the application can be brought down and then 
  immediately brought back up on the new server that is accessing the new FlashCopy target 
  volumes. 
  
  This method differs from the other migration methods, which are described later in this 
  chapter. Common uses for this capability are host and back-end storage hardware refreshes. 