The VMware HCI strategy consists of delivering the best Hyper-Converged Software (HCS) on the broadest set of consumption options. The tightly integrated HCS software stack includes VMware vSphere, the market-leading hypervisor; Virtual SAN, radically simple, enterprise-class native storage; and vCenter Server, a unified and extensible management solution.  The VxRail Appliance is the only HCI appliance jointly developed by VMware and EMC, delivering the best and most complete VMware Hyper-converged Software (HCS) experience.  Virtual SAN Ready Node is a certified VMware HCS x86 server and storage program, offering precertified solutions delivered by all leading server vendors.
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What is the difference between the VxRail Appliance and Virtual SAN Ready Node?