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. Beta testing is currently in progress. 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.
FDR InstantBackup is used to backup those offline images. The following sample output shows the swap of an volume shared by 3 systems. Applications were updating the volume on all of the systems. The swap takes place simultaneously on all 3 systems.