text: **Reclaiming space in storage pools**
  Space on a storage pool volume becomes reclaimable as documents expire or as they are 
  deleted from the volume. For example, documents become obsolete because of aging. 
  
  ASM reclaims the space in storage pools based on a reclamation threshold that you can set 
  for each storage pool. When the percentage of space that can be reclaimed on a volume rises 
  above the reclamation threshold, ASM reclaims the volume. ASM rewrites documents on the 
  volume to other volumes in the storage pool, making the original volume available for new 
  documents. 
  
  ASM checks whether reclamation is needed at least once each hour and begins space 
  reclamation for eligible volumes. You can set a reclamation threshold for each storage pool 
  when you define or update the storage pool. 
  
  During reclamation, ASM copies the files to volumes in the same storage pool unless you 
  specified a reclamation storage pool. Use a reclamation storage pool to allow automatic 
  reclamation for a storage pool with only one drive. See your ASM documentation for details. 
  
  After ASM moves all documents to other volumes, one of the following actions occur for the 
  reclaimed volume: 
  
  (cid:2) If you explicitly defined the volume to the storage pool, the volume becomes available for 
  reuse by that storage pool. 
  
  (cid:2) If the volume was acquired as a scratch volume, ASM deletes the volume from its 
  database. 