With DFSORT, cache fast write (CFW) refers to the capability of DFSORT to take advantage of the storage control unit's cache fast write function when writing to the work data sets. The recommended setting for cache fast write is CFW=YES. If you want to change the CFW setting for a specific application, you can use the CFW or NOCFW options of the DEBUG statement at run-time for that application.

See Cache Fast Write (CFW) for information on the benefits and operation of cache fast write and Hipersorting, memory object sorting, and data space sorting for additional information on using cache fast write effectively. Note that some control units will override this setting and determine for themselves whether or not to cache the data.