There might be times whey you expect DFSMSdss to use FlashCopy® to move the data but FlashCopy was not used. As far as you can tell, your volumes meet all the criteria for FlashCopy use. Use the DEBUG(FRMSG(MINIMAL | SUMMARIZED | DETAILED)) keyword to help you resolve this situation. Include this keyword to indicate the applicable fast replication message level (MIN, SUM, or DTL) in your COPY command. The message level controls the type and amount of information DFSMSdss provides.

DEBUG(FRMSG(MIN | SUM | DTL)) directs DFSMSdss to issue an informational message that indicates why FlashCopy was not used. When you specify FASTREPLICATION(REQUIRED), the informational message is issued in addition to the ADR938E message whether you have specified the DEBUG(FRMSG(MIN | SUM | DTL)) keyword or not.

For more information about the DEBUG keyword, see DEBUG.