Storage Spaces Direct

Storage Spaces and Scale-Out File Server were technologies that came with Windows Server 2012. The lack of stability in the initial versions and the issues with the underlying hardware was a bad phase. The general concept was a shared storage setup using JBODs controlled from Windows Server 2012 Storage Spaces servers, and a magic Scale-Out File Server cluster that acted as the single point of contact for storage:

With Windows Server 2016, the design is quite different and the concept relies on a shared-nothing model, even with local attached storage:

This is the storage design Azure Stack has come up with as one of its main pillars.