Relationship between deleted associated pairs and assigned remote command devices
You can change a 3DC configuration that uses the delta resync function to a configuration that does not use it by deleting pairs. At this time, along with the deleted pairs, associated pairs are also deleted automatically, and the assignment of remote command devices is released automatically.
If you delete pairs when you cannot communicate with remote command devices, the assignment of remote command devices is not released automatically. In this case, refer to information about releasing a remote command device assigned to a mirror.
If you delete pairs after a hardware failure has occurred or after a pair is suspended by error, the assignment of remote command devices you do not want to delete might be released. In this case, check if the necessary remote command devices are still assigned after the deletion. If the assignment is released, reassign the remote command devices.