With regard to Microsoft Storage Spaces Direct (S2D) as a software-only offering, Microsoft does not offer unified support for the entire solution. This means storage software support (Microsoft Storage Spaces Direct) and server hardware support are separate.

Some Tier-1 server hardware vendors like Dell EMC or DataOn do offer hardware+software support in case of S2D Ready-Nodes.

S2D in Windows Server 2019 will be fully supported in mid-January 2019 when hardware will be validated and officially added to the Windows Server Software-Defined (WSSD) Solution list.