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Yes and no :) as the post above mentioned you, an instance is running only on one compute node but you can over provisioning your comp nodes with ratio (cpu and ram) settings. You can spawn an instance with the resource of 3 compute nodes theoretically but you can't use the real ressources. You'r instance is only running on one node and you don't have the possibility to combine the processing power to one instance over all compute nodes (not with OpenStack features).

Cheers Heiko