Storage Spaces Direct (S2D) can be deployed using different compositions:
- Hybrid (Flash + HDD)
- All-Flash (SSD-only / Performance SSD + Capacity SSD / NVMe + SSD)
- Multi-Resilient Volume (Performance SSD + Capacity SSD + HDD / NVMe + Capacity SSD + HDD)

In an all-flash solution, NVMe can be used as a high-performance caching layer whilst large SATA HDDs (eg. 2-4TB) can be used as the persistent storage layer.

Microsoft Server 2019 support Intel Optane DC Persistent Memory. However, the Intel hardware has just entered the beta stage ans as such is not generally available (GA) yet.