1. Introducing 1.uNderstanding the Layers of High Availability o On VSphere, four key technologies or techniques that help provide high availability OS clustering in Microsoft Windows m ESXi host clustering using v Sphere hA a Virtual machine(VM)mirroring using vSphere FT VSAN stretched storage clustering 河南中医药大学/阮晓龙/13938213680/htp/cloudxg.hactcm.edu.cn/http:/www5ucwebcn