text: **3.6.3 Storwize V7000 cluster system zone**
  
  The Storwize V7000 cluster system zone is required only if you deploy solution with more 
  than one control enclosure. The purpose of cluster system zone is to enable traffic between 
  all Storwize V7000 nodes within the clustered system. This traffic consists of heartbeats, 
  cache synchronization, and other data that nodes must exchange to maintain a healthy 
  cluster state. 
  
  Each Storwize V7000 port must be zoned so that it can be used for internode 
  communications. A system node cannot have more than 16 paths to another node in the 
  same system. 
  
  Mixed port speeds are not possible for intracluster communication. All node ports within a 
  clustered system must be running at the same speed. 
  
  Storwize V7000 supports the use of mixed fabrics for communication between nodes. The 
  10 GbE FCoE ports of one Storwize V7000 can be zoned to the FC ports of another node that 
  is part of the same clustered system. 