text: *Figure 5-18 Content Manager OnDemand for i disk pool definition*
  
  **Optical storage group**
  *Optical storage groups*are used by Content Manager OnDemand to group sets of optical 
  volumes for the storage of related data. Optical storage groups are used to group physical 
  optical volumes and virtual optical volumes. Each optical storage group must contain only one 
  type (physical or virtual). By using a specific storage group in the migration policy, the 
  administrator can control the sets of reports that are stored on a particular set of optical 
  volumes. Use IBM Navigator for i to define the optical storage group (Figure 5-19). 