It does not use any additional communication between systems. Swapping of a volume can be terminated at any time before the final swap without affecting the original device or any applications using it. When all volumes in an old disk subsystem have been swapped to new disks, the old subsystem can be disconnected and removed. The only exceptions are volumes containing active page or swap datasets or active coupling facility datasets. The swap is accomplished with minimal impact on the performance of applications using the volumes being swapped.
Applications continue to execute, unaware that the data movement is occurring or has completed.
The following sample output shows the swap of an TSO volume shared by 10 systems. Users and applications were accessing the volume on all of the systems. Click here to view the sample swap output. It can swap disk volumes between disks of the same type from the same hardware vendor or different hardware vendors without any special software or hardware modifications. Move terabytes of data - even installations with maintenance windows do not have the time to move the terabytes residing in large shops.