QuickOPC and EC (see also section “Coexistence of QuickOPC and EC” in "Local replication with clones") can be used in combination with REC. A number of cases must be distinguished here:
Clone units are assigned to the source unit and/or target unit of a REC pair. They are consequently simultaneously the original unit of the clone pair.
The REC source unit is simultaneously the clone unit of a clone pair.
An QuickOPC/EC clone unit cannot simultaneously also be a REC target unit.
In all described cases REC can be operated in synchronous and in asynchronous copy mode, see chapter "Remote replication with REC".
You can switch from cascaded remote copy to concurrent remote copy and vice versa with the /SWAP-REMOTE-COPY TARGET-UNIT= command, see "Remote replication with REC". This gives rise to various combinations of QuickOPC/EC and REC.