DataCenter Its a logical entity defining a set or resources.these set of resources include collection of number of clusters of Virtual meachines , Network and Sotrage. The datacenter is highest level of containment of all these resources ( physical and logical ) managed in virtual environment
Storage Its a abstracted view of the physical storage assigned to a data center.It is either iSCSI, or Fiber Channel, or NFS
Cluster set of physical hosts that are treated as a resource pool.Hosts in a cluster share the same network infrastructure and the same storage. When in a cluster virtual meachines can move from host to host
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