Hi, When we try to add ephemeral disk in booting instance, as we know that it will create disk.local and the backing file in _base. Both of them are referred to the ephemeral disk. When nova reports the disk usage of compute, does it count both of them for the used disk? What I see in the resource_tracker that it calculates the instance['ephemeral_gb']. Tuan -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20160803/e9b01c00/attachment-0001.html>