StarWind Virtual SAN replicates the storage to protect data within the cluster. In addition, hardware or software RAID is implemented to enhance the robustness of individual nodes.
Replicas+Hardware RAID: Before any write is acknowledged to the host, it is synchronously replicated to one or two designated partner nodes. This means that with 2N one instance of data that is written is stored on the local node and another instance of that data is stored on the designated partner node in the cluster. With 3N one instance of data that is written is stored on the local node, and two other instances of that data are stored on designated partner nodes in the cluster. When a physical disk fails, hardware RAID maintains data availability.
StarWind, Virtual SAN [SDS]/13279, x86
Disk Failure Protection, Reads/Writes, Data Availability