I am interested to see how other service providers handle the cases where there is a need to reboot a hypervisor but it is planned (such as a reboot after OS patching). We do not want to do live or block migration for these cases as there is no shared storage and block migration can be a bit unreliable at times. In my ideal case, we would be able to warn the VMs in some way so they can do a reasonable job of shutting down. In some cases, our users would like many minutes of notice to complete their current transaction. Does anyone know of a standard mechanism for hypervisor communicating to the guest to warn of an impending shutdown ? Tim -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20130516/f58b5545/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 5215 bytes Desc: not available URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20130516/f58b5545/attachment.bin>