text: This example and all of the following examples, from an external perspective, show a single 
  Content Manager OnDemand instance. The fact that the system consists of multiple 
  distributed systems is transparent to both of the following groups: 
  
  (cid:2) The Content Manager OnDemand administrator, who continues to administer the system 
  through the Content Manager OnDemand Administrator Client as though it is a single 
  physical system. 
  
  (cid:2) The Content Manager OnDemand users, who continue to access the whole system 
  
  through a single IP address (that of the library server) and see only a single system from 
  their perspective. 
  
  **12.2.4 Horizontal and vertical scalability: Storage manager**
  
  This form of horizontal scalability provides better performance, reliability, and scalability by 
  distributing the storage and retrieval workload over multiple storage subsystems within each 
  object server. 
  
  An object server controls the storage and retrieval of the archived data. The archived data is 
  stored in a storage subsystem. The number and architecture of these subsystems can be 
  scaled to the limitations of the subsystem. Each object server can support one or more 
  storage subsystems, and each storage subsystem can consist of multiple storage devices, as 
  shown in Figure 12-3. 