You will need a replication manager instance at both sites in order to recover at the secondary site if the primary site were to fail.  Licenses for each instances will be required.
Hi,   I'm hoping for a bit of clarification on Replication Manager and the Application Protection Suite. Do I need to license the primary and recovery array for application protection suite and do I need a Replication Manager instance at both sites for a disaster recovery scenario?  Thanks  JP
Replication Manager requirements