text: Figure 11-93 Global Mirror with Change Volumes 
  
  With Change Volumes, a FlashCopy mapping exists between the primary volume and the 
  primary change volume. The mapping is updated in the cycling period (60 seconds to one 
  day). The primary change volume is then replicated to the secondary Global Mirror volume at 
  the target site, which is then captured in another change volume on the target site. This 
  approach provides an always consistent image at the target site and protects your data from 
  being inconsistent during resynchronization. 
  
  For more information about IBM FlashCopy, see 11.1, “IBM FlashCopy” on page 436. 