Open Stack

>> I would prefer that Openstack handles this by copying the image between the hosts when it is no longer in Glance.
>An alternative would be that an image, when 'deleted' by a customer/admin, doesn't actually get deleted - it is 
>just hidden and no longer available to be deployed by a user. It should remain in this state until all instances
>making use of it are deleted.

FYI: I created a bug report to get this issue noticed:
https://bugs.launchpad.net/nova/+bug/1281087

Cheers,
Robert van Leeuwen