From mboxrd@z Thu Jan 1 00:00:00 1970 From: Riccardo Veraldi Subject: live migration problems. Date: Fri, 30 Mar 2012 23:45:47 +0200 Message-ID: <4F76298B.4020804@cnaf.infn.it> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from smtpauth2.cnaf.infn.it ([131.154.3.56]:56171 "EHLO smtpauth2.cnaf.infn.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933610Ab2C3Vzj (ORCPT ); Fri, 30 Mar 2012 17:55:39 -0400 Received: from [172.16.29.235] (host-41-8.stel.it [31.177.41.8] (may be forged)) (authenticated bits=0) by smtpauth2.cnaf.infn.it (8.14.5/8.14.5) with ESMTP id q2ULjr1o017351 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=OK) for ; Fri, 30 Mar 2012 23:45:53 +0200 Sender: kvm-owner@vger.kernel.org List-ID: Hello, I have problems with live migration. I have several VMs in a CentOS 6.2 cluster environment. When I migrate one virtual machine from nodeA to nodeB the migration goes smoothly but in the same time the VM is migrated an external ping cannot reach the VM. I ping the VM before migration and after the migration is done ping stops to work. This happens for some VM and does not happen for other VM. Apparently the VM are configured the same way so I can't understand why this is happening. If I migrate the VM back to the original physical node the ping start working again like if the switch did not realize the VM mac address changed switch port. To make things work always I Should make a ping from the VM console to whatever host and in this case the arp table is updated on the switch. The strange thing as I said is that some VM seems to always work after migration while other seems never to work untl they are migrated back to original cluster node. Any hints or suggestions ? thank you very much Rick