Activating the logs out of any connections to controller 4 for both controllers in the storage subsystem. This process reserves the port for mirror data transmission. I/O requests received on this port are accepted only from the remote of the other logical drive in the mirrored pair.
Important:
Before you can create a remote mirror, you must activate RM on both the primary site and the secondary site.After you have activated RM on the primary storage subsystem and the secondary storage subsystem, you can start creating remote mirrors. If you have not already created the primary logical drive and secondary logical drive, create those logical drives before you create the remote mirror.
If you need to deactivate the RM premium feature at a later time, select Storage Subsystem >> Enhanced Remote Mirroring >> Deactivate .