You don’t need to create separate replication for each SP. As for the performance during replication it will depend on which models and what networking you have. [URL] [URL] and [URL] may have more information.
Hello,   I'm trying to set up replication. 1. When cloning a NAS server, are the file system, network IP address, and FSN configuration information copied together? 2. Can only one NAS box interface (SPA, SPB) be configured? Or do I need a separate port for each? 3. How many operations can be performed during block/NAS replication?
Dell EMC Unity Async Replication NAS,Block