text: Figure 3-4 on page 56 shows an example of a balanced zoning configuration that was 
  created by completing the following steps: 
  
  1. Divide ports on the I/O Group into two disjoint sets, such that each set contains two ports 
  from each I/O Group node, each connected to a different fabric. 
  
  For consistency, use the same port number on each I/O Group node. The example that is 
  shown in Figure 3-4 on page 56 assigns ports 1 and 4 to one port set, and ports 2 and 3 to 
  the second set. 
  
  Because the I/O Group nodes have four FC ports each, two port sets are created. 
  
  2. Divide hosts attached to the I/O Group into two equally numerous groups. 
  
  In general, for I/O Group nodes with more than four ports, divide the hosts into as many 
  groups as you created sets in step 1. 
  
  3. Map each host group to exactly one port set. 
  
  4. Zone all hosts from each group to the corresponding set of I/O Group node ports. 
  
  The host connections in the example on Figure 3-4 on page 56 are defined in the following 
  manner: 
  
  – Hosts in group one are always zoned to ports 1 and 4 on both nodes. 
  – Hosts in group two are always zoned to ports 2 and 3 on both nodes of the I/O Group. 