Although two-way replication (2N) is supported, it is recommended only in limited use cases due to the lower data protection level.
Stretched clusters behave exactly the same as non-stretched clusters. Replication policies and data locality can be managed using Fault Sets and Placement Groups. Fault Sets can be defined to store copies of the data on nodes in different sites.
StorPool, StorPool [SDS]/19.01, x86
SC Data Redundancy, Disaster Recovery, Data Availability