Hi, I have a customer using a Pyrhon script to shelve/unshelve instance periodicly in the openstack, *He use openstack's std library for python and thus call * if (novaC.servers.get(server).status=='ACTIVE'): (novaC, cinderC, server, 'stop') -> nova.servers.stop() while (novaC.servers.get(server).status!='SHUTOFF'): time.sleep(10) if (novaC.servers.get(server).status=='SHUTOFF'): controlServer(novaC, cinderC, server, 'shelve') -> nova.servers.shelve() seems that script uses async function, which I supose be the problem.It is possible from nova API manipulate async requests ?