VersaStack is a converged infrastructure reference architecture developed as a collaborative effort of IBM and Cisco.
A converged infrastructure (CI) reference architecture is a document specifying the design, components and configuration of a CI system, which includes storage, compute and networking resources within a single-box system. The VersaStack document specifies Cisco UCS (unified computing system) and Nexus and MDS 9000 switches with IBM Storwize V7000 storage arrays. The system specified will work with Cisco ACI, like the VCE VxBlock. Storwize V7000 is virtualized storage with automated data tiering to flash and disk.
Reference architectures allow an organization to create their own converged or hyper-converged systems rather than purchasing a vendor's hardware product. Following established guidelines and best practices helps to speed deployment and ensure functionality.