A dedicated storage network
"Virtual SAN utilizes a dedicated VMkernel port type and proprietary transport protocol for internode traffic. "
"Because vSphere Network I/O Control requires the use of a VMware vSphere Distributed Switch™ (VDS), all editions of Virtual SAN include VDS capability. For optimal performance, VMware recommends the use of a dedicated storage network."
And this is different or better from my current storage implementation how?