text: With native IP partnership, the following Copy Services features are supported: 
  
  (cid:2) Metro Mirror 
  
  Referred to as*synchronous replication*, MM provides a consistent copy of a source 
  volume on a target volume. Data is written to the target volume synchronously after it is 
  written to the source volume so that the copy is continuously updated. 
  
  (cid:2) Global Mirror and GM with Change Volumes 
  
  Referred to as*asynchronous replication*, GM provides a consistent copy of a source 
  volume on a target volume. Data is written to the target volume asynchronously so that the 
  copy is continuously updated. However, the copy might not contain the last few updates if 
  a DR operation is performed. An added extension to GM is GM with Change Volumes. GM 
  with Change Volumes is the preferred method for use with native IP replication. 
  
  **Note:**For IP partnerships, generally use the Global Mirror with change Volumes 
  method of copying (asynchronous copy of changed grains only). This method can have 
  performance benefits. Also, Global Mirror and Metro Mirror might be more susceptible 
  to the loss of synchronization. 