text: The auxiliary volume must be equal in size to the master volume or the command fails. If both 
  volumes are in the same system, they must be in the same I/O Group. The master and 
  auxiliary volume cannot be in an existing relationship, and they cannot be the target of a 
  FlashCopy mapping. This command returns the new relationship (relationship_id) when 
  successful. 
  
  When the MM/GM relationship is created, you can add it to an existing Consistency Group, or 
  it can be a stand-alone MM/GM relationship. 
  
  **The lsrcrelationshipcandidate command**
  Use the**lsrcrelationshipcandidate**command to list the volumes that are eligible to form an 
  MM/GM relationship. 
  
  When the command is issued, you can specify the master volume name and auxiliary system 
  to list the candidates that comply with the prerequisites to create a MM/GM relationship. If the 
  command is issued with no parameters, all of the volumes that are not disallowed by another 
  configuration state, such as being a FlashCopy target, are listed. 
  
  **11.7.7 Changing Metro Mirror/Global Mirror relationship**
  
  Use the**chrcrelationship**command to modify the following properties of an MM/GM 
  relationship: 
  
  (cid:2) Change the name of an MM/GM relationship. 
  (cid:2) Add a relationship to a group. 
  (cid:2) Remove a relationship from a group by using the**-force**flag. 