VMware Virtual SAN is a Software Defined Storage solution from VMware that also fits in the hyper(visor)-converged model. Although is a separate product, the core functions to implement it are already present in the vSphere versions making really easy to deploy and enable it. Is a really fast growing product, by the end of 2016, VMware HCI solutions powered by vSAN have more than 7,000 customers (more than Nutanix and SimpliVity combined, but will be nice know how many are really in production).