text: **3.12 Host attachment planning**
  
  The typical FC host attachment to the Storwize V7000 is done through SAN fabric. However, 
  the system allows direct attachment connectivity between its 8 Gb or 16 Gb Fibre Channel 
  ports and host ports. No special configuration is required for host systems that are using this 
  configuration. However, the maximum number of directly attached hosts is severely limited by 
  the number of FC ports on Storwize V7000’s nodes. 
  
  The Storwize V7000 imposes no particular limit on the distance between the Storwize V7000 
  nodes and host servers. However, for host attachment, the Storwize V7000 supports up to 
  three ISL hops in the fabric. This capacity means that the server to the Storwize V7000 can 
  be separated by up to five FC links, four of which can be 10 km long (6.2 miles) if long wave 
  Small Form-factor Pluggables (SFPs) are used. 
  
  Figure 3-9 shows an example of a supported configuration with Storwize V7000 nodes using 
  shortwave SFPs. 