Open Stack

> Pros:
> plays nicely with libvirt, so the vm is only paused for the minimum amount
> of time
> Cons:
> requires libvirt 9.5, which doesn't exist in oneiric

libvirt 9.5 requirement sounds acceptable.

Reason:
In general, Essex does not target 11.10-Oneiric, because Diablo is
part of Oneiric.

Essex is really designed to be fully integrated with newer platforms,
such as Ubuntu 12.04 LTS "Precise" and Debian 7.0 "Wheezy", so those
are the targets. (not sure about other vendor's plans)

As for 11.10-Oneiric:
Essex was essentially back-ported to it, so a good solution would be
just extending the backport effort to include the newer libvirt, as
part of the OpenStack PPA for Oneiric.

-- 
-Alexey Eromenko "Technologov"