text: Each volume copy is not a separate object and can be manipulated only in the context of the 
  volume. A mirrored volume behaves in the same way as any other volume; that is, all of its 
  copies are expanded or shrunk when the volume is resized. The volume can participate in 
  FlashCopy and remote copy relationships, is serviced by an I/O Group, and includes a 
  preferred node. 
  
  An overview of volume mirroring is shown in Figure 7-6. 