.---FASTREPlication----(--PREFerred--)-----.   
>>-+------------------------------------------+----------------><
   '-+-FASTREPlication-+--(--+-PREFerred-+--)-'   
     '-FR--------------'     +-REQuired--+        
                             '-NOne------'        

FASTREPLICATION specifies whether the use of fast replication is preferred, required, or not desired. This keyword applies to fast replication methods such as FlashCopy® and SnapShot. It does not affect concurrent copy or virtual concurrent copy processing.

PREFERRED specifies that you want to use a fast replication method, if possible. If fast replication cannot be used, DFSMSdss completes the operation using traditional data movement methods. PREFERRED is the default (unless changed to NONE by the installation).

REQUIRED specifies that fast replication must be used. For full volume or tracks COPY operations, DFSMSdss fails the operation if fast replication cannot be used. For a data set COPY operation, DFSMSdss stops processing the current data set if fast replication cannot be used. However, DFSMSdss continues processing the rest of the data sets using fast replication. When the DEBUG(FRMSG(MIN|SUM|DTL)) keyword is not specified, DFSMSdss still issues summarized information regarding why a fast replication method cannot be used as though DEBUG(FRMSG(SUMMARIZED)) had been specified. The DEBUG(FRMSG(MIN | SUM | DTL)) keyword determines the amount of information provided for why you cannot use a fast replication method.

NONE specifies that fast replication should not be used. DFSMSdss does not attempt to use fast replication and completes the operation using traditional data movement methods.