The FASTREPLICATION(REQUIRED | PREFERRED | NONE) keyword tells DFSMSdss how you want fast replication such as SnapShot to be used. The default is FASTREPLICATION(PREFERRED).

FASTREPLICATION(REQUIRED) specifies that DFSMSdss must use fast replication such as SnapShot to move data. If SnapShot cannot be used, DFSMSdss issues error message ADR938E which indicates that the processing of the current data set or the entire COPY task failed. If the processing of the current data set failed, DFSMSdss does not try any other methods of data movement for the current data set. However, DFSMSdss attempts to use fast replication such as SnapShot for the subsequent data sets. If the entire copy task failed, DFSMSdss terminates the copy operation.

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

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

FASTREPLICATION(NONE) specifies that you do not want DFSMSdss to use SnapShot to copy data. Instead, DFSMSdss attempts to use virtual concurrent copy if the CONCURRENT keyword is specified. If virtual concurrent copy cannot be used, DFSMSdss uses traditional data movement methods to move the data.

For more information about the FASTREPLICATION keyword, see FASTREPLICATION.