Home > Storage > Unity XT > Virtualization, Cloud & Applications > Dell Unity XT: Microsoft SQL Server Best Practices > Synchronous replication
Dell Technologies recommends including a flash tier in a hybrid pool where synchronous replication will be active.
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 synchronous replication port. If the CNA ports are configured as 10 GbE, port 0 of the lowest numbered FC I/O Module is the replication port. Additional information can be found in the Dell Unity XT: Replication Technologies white paper.