StarWind HCA uses replicas to protect data within the cluster. In addition, hardware 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.
The hardware RAID level that is applied depends on the media type and the number of devices used:
Flash drives = RAID5
2 Flash drives in Hybrid config = RAID1
Magnetic drives = RAID10
2 Magnetic drives in Hybrid config = RAID1
StarWind, HCA [HCI]/13279, x86
Disk Failure Protection, Reads/Writes, Data Availability