VMware vSphere Storage Appliance Technical Whitepaper
In VMware vSphere 5.0, VMware is releasing a new software storage appliance to the market called the vSphere Storage Appliance. This appliance provides an alternative shared storage solution for small-to-medium business customers who might not be in a position to purchase a SAN or NAS array for their virtual infrastructure. Without shared storage configured in a vSphere environment, customers have not been able to exploit the unique features available in vSphere 5.0, such as vSphere High Availability, vSphere® vMotion, and vSphere Distributed Resource Scheduler. The VSA is designed to provide shared storage for everyone.