text: Typically, this methodology is employed under the following circumstances: 
  
  (cid:2) Most of the data access occurs during the initial period. After that period, the data is 
  infrequently accessed, if ever. So, after this initial period, the data is migrated to the 
  storage manager. 
  
  (cid:2) A performance advantage is possible if you retrieve the data from cache versus if you 
  
  retrieve the data from the storage manager. The performance advantage for cache can 
  occur if the storage manager is on a device that is separate from the Content Manager 
  OnDemand object server, or if the storage manager is local but the storage device is 
  relatively slow, such as tape or an optical disk. 
  
  **Migrating data from cache**
  This function, which can be accessed by clicking**Advanced**on the Storage Manager tab of 
  the Application Group window, determines how long the data is kept in cache before it is 
  migrated to archive storage (on a potentially slower archive storage device). 
  
  The data needs to be kept on a high-performance storage device for the period during which 
  it is retrieved frequently. The storage set must support the type of media that is required to 
  hold reports that are stored in the application group. For example, if you must maintain 
  reports in cache storage for 90 days and in archive storage for seven years, the storage set 
  must identify a storage node (or migration policy) that causes ASM to maintain the data for 
  seven years, and you must select**Cache Data for__Days**and enter 90 in its field. 