The VM.StoragePlacementSpec structure contains information used to store a virtual machine’s files.
Datastore on which the virtual machine’s configuration state should be stored. This datastore will also be used for any virtual disks that are created as part of the virtual machine creation operation. This field is currently required. In the future, if this field is unset, the system will attempt to choose suitable storage for the virtual machine; if storage cannot be chosen, the virtual machine creation operation will fail. When clients pass a value of this structure as a parameter, the field must be an identifier for the resource type: Datastore. When operations return a value of this structure as a result, the field will be an identifier for the resource type: Datastore.