text: To ensure the integrity of the copy that is made, it is necessary to flush the host operating 
  system and application cache for any outstanding reads or writes before the FlashCopy 
  operation is performed. Failing to flush the host operating system and application cache 
  produces what is referred to as a*crash consistent*copy. 
  
  The resulting copy requires the same type of recovery procedure, such as log replay and file 
  system checks, that is required following a host crash. FlashCopies that are crash consistent 
  often can be used after file system and application recovery procedures. 