as per the official Microsoft position on windows server 2019 Data Centre
"...When can I deploy Storage Spaces Direct in Windows Server 2019 into production?Microsoft recommends deploying Storage Spaces Direct on hardware validated by the WSSD program. For Windows Server 2019, the first wave of WSSD offers will launch in February 2019, in about three months.
If you choose instead to build your own with components from the Windows Server 2019 catalog with the SDDC AQs, you may be able to assemble eligible parts sooner. In this case, you can absolutely deploy into production – you’ll just need to contact Microsoft Support for instructions to work around the advisory message. ..."
regards,
Alex