IDC11617I   RESETTOSIMPLEX COMMAND IN PROCESS. HOWEVER, DASD FAST WRITE COULD NOT BE DEACTIVATED. COPIES MAY NOT BE IDENTICAL.

If an active duplex pair is ended with DASD fast write active, the resulting simplex volumes may not be true copies. When ending a duplex pair, IDCAMS issues a channel command to deactivate DASD fast write to allow for destage of any DASD fast write data. This attention message is issued when the attempt to deactivate DASD fast write failed (probably because DASD fast write was in pending state from another job). If DASD fast write was on prior to issuing the RESETTOSIMPLEX channel command, then DASD fast write would have been reactivated for the primary of the ended pair.