Hi folks I report this bug recently. device_id should not be updated twice https://bugs.launchpad.net/quantum/+bug/1031473 Now, a user can update device_id which may cause problem. This is related to port id spec for nova boot. https://bugs.launchpad.net/nova/+bug/1031096 My question is how we should deal with port on the failure or deletion. My patch will delete the port on failure or deletion https://review.openstack.org/#/c/10639/ Another spec could be update port device_id for None. But this is depends on how we solve bug 1031473. Any thought? -- Nachi Ueno email:nati.ueno at gmail.com twitter:http://twitter.com/nati