text: **3.15 Advanced Copy Services**
  
  The Storwize V7000 offers the following Advanced Copy Services: 
  
  (cid:2) FlashCopy 
  (cid:2) Metro Mirror 
  (cid:2) Global Mirror 
  
  **Layers:**A property called*layer*for the clustered system is used when a copy services 
  partnership exists between a Storwize V7000 and an IBM Storwize V7000. There are two 
  layers:*replication*and*storage*. By default, the IBM Storwize V7000 is configured as 
  storage layer. This configuration must be changed by using the**chsystem**CLI command 
  before you use it to make any copy services partnership with the Storwize V7000. 
  
  Figure 3-10 shows an example of replication and storage layers. 