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Regarding VMs, No you can't. When you try to launch a VM the scheduler selects any ONE available compute node and launch the instance in that node. If you try to launch any flavor which any compute node could not hold, the you will get a 'No valid host found' error.

Regarding Cinder, if the cinder backend is ceph, then you can create a combined volume. If you are using local disks, then it works on the same concept of LVM and volumes from other cinder nodes cant be used to create a volume-group.