Once a multi-target configuration is created, an incremental relationship is created internally between the secondary devices.
The incremental relationship can minimize the amount of data that must be copied to resynchronize the new pair in a recovery scenario, because only the changed data is copied. To use the internal incremental relationship to resynchronize the secondaries, you must establish paths between them. Then, you can resynchronize them with the PPRC FAILBACK command. It is recommended, but not required, that you establish the paths between the secondaries before creating the multi-target configuration.
If there are any problems establishing the internal relationship, the system retries until it is successful.
If a pair is removed from the multi-target configuration, the internal pair is also removed.
