text: For more information about HyperSwap implementation and best practices, see IBM Storwize 
  V7000, Spectrum Virtualize, HyperSwap, and VMware Implementation, SG24-8317. 
  
  **11.6.20 Consistency Protection for Global Mirror and Metro Mirror**
  
  Metro Mirror, Global Mirror, Global Mirror with change volumes, and HyperSwap Copy 
  Services functions create remote copy or remote replication relationships between volumes 
  or Consistency Groups. If the secondary volume in a Copy Services relationship becomes 
  unavailable to the primary volume, the system maintains the relationship. However, the data 
  might become out of sync when the secondary volume becomes available. 