Hi all: I found a discuss about the libvirt shutdown API maybe hang when shutdown instance in libvirt community, https://www.redhat.com/archives/libvir-list/2015-March/msg01121.html I'm not sure that whether there are some risks when we shutdown instance in nova. Three questions: 1. Whether acpi is the default shutdown mode in QEMU/KVM hypervisor when we shutdown instance using libvirt? 2. Whether acpi is asynchronous mode, and qemu-agent is synchronous mode when we shutdown instance? 3. If the hypervisor use qemu-agent as default shutdown mode, how we can deal the hanging issue? Best Regards. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20150326/4e580a11/attachment.html>