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The subject says it all - does anyone know of a method by which quota can be enforced on storage provisioned via Nova rather than Cinder? Googling around appears to indicate that this is not possible out of the box (e.g., https://ask.openstack.org/en/question/8518/disk-quota-for-projects/).

The rationale is we offer two types of storage, RBD that goes via Cinder and LVM that goes directly via the libvirt driver in Nova. Users know they can escape the constraints of their volume quotas by using the LVM-backed instances, which were designed to provide a fast-but-unreliable RAID 0-backed alternative to slower-but-reliable RBD volumes. Eventually users will hit their max quota in some other dimension (CPU or memory), but we'd like to be able to limit based directly on how much local storage is used in a tenancy.

Does anyone have a solution they've already built to handle this scenario? We have a few ideas already for things we could do, but maybe somebody's already come up with something. (Social engineering on our user base by occasionally destroying a random RAID 0 to remind people of their unsafety, while tempting, is probably not a viable candidate solution.)
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