text: Distribute your disk expansion enclosures evenly between control enclosures, nodes within 
  control enclosures, and SAS channels within nodes. For more information, search for “SAS 
  cabling guidelines” at this IBM Knowledge Center page. 
  
  When planning SAN cabling make sure that your physical topology allows you to observe 
  zoning rules and recommendations. 
  
  If the data center provides more than one power source, make sure that you use that capacity 
  when planning power cabling for your system. 