Using the FCWAIT keyword

When you reverse the direction of an Incremental FlashCopy®, the storage facility requires that the previous background copy be completed. You can specify the FCWAIT keyword with a query interval value in seconds and a number of retries value to direct DFSMSdss to wait for background copy completion before initiating the new Incremental FlashCopy.

Note:

Incremental FlashCopy relationship is limited to one full volume incremental relationship per volume. However, an Incremental FlashCopy relationship can coexist with other non-incremental FlashCopy relationships. Other limits remain, such as each source track can have up to 12 targets.
Incremental FlashCopy is only possible with a persistent relationship. With persistent relationships, the relation between the source and target is maintained after the background copy has completed.
DFSMSdss allows you to copy full volumes to target devices of greater capacity. However, if the original FlashCopy target volume is bigger than the source volume, you cannot reverse the FlashCopy direction.
When you specify DUMPCONDITIONING with FCINCREMENTAL, the volume serial number of the target volume does not change, and the target volume remains online after the copy. A subsequent incremental copy can be made without additional procedure.
When you specify COPYVOLID with FCINCREMENTAL, the volume serial number of the target volume is changed to match the source's. When the volume serial number on a DASD volume is changed, the operator is notified. The operating system then initiates a demount of the volume. Before performing a subsequent incremental copy using DFSMSdss, the offline volume's volume serial number must be changed through a utility such as ICKDSF and the volume must be varied online.
The PURGE keyword might be required on subsequent incremental copies.