The FASTREPLICATION(REQUIRED | PREFERRED | NONE) keyword tells DFSMSdss how you want FlashCopy® to be used. The default is FASTREPLICATION(PREFERRED).

FASTREPLICATION(REQUIRED) specifies that DFSMSdss must use fast replication such as FlashCopy to move data. If FlashCopy cannot be used, DFSMSdss issues error message ADR938E and the copy operation fails. DFSMSdss does not try any other methods of data movement.

Restriction: You cannot use the FASTREPLICATION(REQUIRED) and CONCURRENT keywords together.

FASTREPLICATION(PREFERRED) specifies that DFSMSdss attempt to use FlashCopy before any other method to move data (even when you specify the CONCURRENT keyword). If FlashCopy cannot be used and you have specified the CONCURRENT keyword, DFSMSdss attempts to use concurrent copy. If you have not specified the CONCURRENT keyword or if concurrent copy has failed, DFSMSdss uses traditional data movement methods to copy the data.

FASTREPLICATION(NONE) specifies that DFSMSdss not attempt to use FlashCopy to copy data.

For more information about the FASTREPLICATION keyword, see FASTREPLICATION.