text: **12.3.2 Multiple LPAR sysplex: z/OS**
  
  The z/OS operating system has a high availability architecture that is built into it. A z/OS 
  Parallel Sysplex is a tightly coupled cluster of independent z/OS systems that connect 
  through an Internet Protocol network. A cluster is 2 - 32 independent systems that are locally 
  or geographically dispersed. Communication between the z/OS systems in the sysplex is 
  handled through the cross-system Coupling Facility (XCF). A z/OS Parallel Sysplex 
  implementation provides the highest level of high availability in the industry. 
  
  Figure 12-6 illustrates a Content Manager OnDemand implementation of a two-system highly 
  available z/OS sysplex system. 