text: **Important:**The aggregation process occurs before the migration of the object from 
  disk to the first ASM storage level. Only aggregate files that are closed are eligible for 
  migration by ASM. If the specified maximum file size is large and the size of the 
  archived objects is small, the aggregate file can remain open for long periods. Also, the 
  Content Manager OnDemand objects might remain on disk longer than the period that 
  is specified by the application group. Choosing to close the aggregate after a specified 
  period addresses this problem. 
  
  (cid:2) Tape backup requested and media type: The Tape backup requested field indicates 
  
  whether a one-time tape backup must be made of the data before it is archived. The Media 
  type field indicates the type of tape to use for the backup. 
  
  (cid:2) Storage levels in this policy: This section determines the path that the archived data 
  
  follows through the different archive storage media. The order of the levels determines the 
  migration sequence. Storage levels are created by placing the cursor on an existing 
  storage level (if one exists) and clicking**Add Before**or**Add After**. The Migration Policy 
  Storage Level Definition window (Figure 5-22) opens. 