Designating FlashCopy usage

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 FlashCopy to move data. If FlashCopy cannot be used for reasons other than normal reasons, DFSMSdss issues message ADR945W and error message ADR938E, which indicates that the processing of the current extent failed. DFSMSdss terminates DEFRAG processing. If the volume involved in the DEFRAG or CONSOLIDATE operations reside on a storage subsystem that is cascaded FlashCopy capable, FlashCopy failures for normal reasons will no longer occur except for the case when the maximum number of relations would be exceeded.

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

FASTREPLICATION(PREFERRED) specifies that you want DFSMSdss 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, refer to FASTREPLICATION.