text: Then, the system is able to see external Storwize systems as storage controllers and can 
  virtualize LUs that are provided by them. 
  
  You also get a warning that your Storwize is in a*storage layer*if you try to add an iSCSI 
  storage controller with the GUI. The system prompts you to convert the system to*replication*
  *layer*automatically. 
  
  **Note:**Before you change the system layer, the following conditions must be met: 
  
  (cid:2) No host object can be configured with worldwide port names (WWPNs) from a Storwize 
  family system. 
  
  (cid:2) No system partnerships can be defined. 
  
  (cid:2) No Storwize family system can be visible on the SAN fabric. 
  
  To switch IBM Storwize V7000 system layer, you can also use**chsystem**CLI command, as 
  shown in Example 6-23. If executed successfully, it returns no output. 
  
  Example 6-23 Changing system layer 
  
  IBM_Storwize:ITSOV7K:superuser>lssystem |grep layer 
  layer storage 
  IBM_Storwize:ITSOV7K:superuser>chsystem -layer replication 
  IBM_Storwize:ITSOV7K:superuser> 