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Dell Technologies recommends including a Flash tier in a hybrid pool where synchronous replication will be active. This is applicable to both the source and the destination pools.
Synchronous replication transfers data to the remote system over the first Fibre Channel port on each SP. When planning to use synchronous replication, it may be appropriate to reduce the number of host connections on this port. When the CNA ports are configured as FC, CNA port 4 is defined as the replication port. If the CNA ports are configured as Ethernet, then port 0 of the lowest numbered FC I/O Module is the replication port.
When possible, create the synchronous replication session before filling the source storage object with data, as this alleviates the need to perform initial synchronization of the replication session. This is typically the fastest way to populate the destination storage object with synchronous replication.
When sizing a disaster recovery solution using synchronous replication, consider provisioning a destination system that has similar performance capabilities as the source system. This can help maintain the same level of application performance after a failover event.