QuickOPC and EC (see also section “Coexistence of QuickOPC and EC” in "Local replication with clones (ETERNUS DX/AF, Symmetrix/VMAX3)") 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 (for ETERNUS DX/AF) in asynchronous copy mode, see chapter "Remote replication with REC (ETERNUS DX/AF)".
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 (ETERNUS DX/AF)". This gives rise to various combinations of QuickOPC/EC and REC.