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A VM runs in a single compute node. You can't "spread" it over several compute nodes.

However, you can configure a cloud to overbook CPUs, RAM and storage. This allows you to run VMs that use more resources than are available. By default, I believe the CPU overbooking factor is 1 (i.e. no overbooking), RAM is 1.5 and storage is a higher number that I forgot.