You can always overcommit, so hard to tell when no resources are left.
You can use quote to limit to physical resources.

Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109

Tel : +972 (9) 7692306
        8272306
Email: ydary@redhat.com
IRC : ydary

On Mon, Jan 18, 2016 at 11:52 PM, David Jorm <djorm@iix.net> wrote:
Hi All

My team is currently building an application based on the oVirt REST
API, and we noticed that it is possible to create a VM with resources
(i.e. RAM or CPU) that are not physically available in the cluster.
Running the VM will fail with an appropriate error message, but for
our use case it would be highly desirable that the VM creation fails.
I haven't found any setting that enables this behavior, but I was
wondering if one is hidden somewhere or there is a simple workaround
to make VM creation fail if resources are not available to run it.

Thanks
David
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