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Check the nova-scheduler logs to see if the scheduler filters filtered out all of your compute hosts (like if quota were full or there were no compute hosts with resources available to fit your request - like maybe the flavor is too big for what resources you have), else check the nova-compute logs - this is when the scheduler picks a compute host and it gets down to building storage/networking/talking to the hypervisor and fails, generally those are easier to find because there is a decent sized stacktrace with a more specific error.