Hey folks, I am running libvirt 1.2.4 and qemu 2.1 on a 3.14.27 kernel. I've found that live migrating a relatively large VM (16 cores and 64G ram) is taking forever - close to 15 hours now, and still not done... With "lsof -i", I can see a connection is established from my source hypervisor to a target hypervisor, likely for the purpose of copying data. nettop shows that this connection is constantly sending 50-60MBps traffic. The VM being migrated has a disk on ceph by using librbd. I wonder if anyone has seen similar issues, and how I could troubleshoot further. (I tried but failed to get qemu monitor to work on the VM...) Thanks. -Simon _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users

On Thu, Jan 22, 2015 at 9:11 PM, Xu (Simon) Chen <xchenum(a)gmail.com&gt; wrote: > Hey folks, > > I am running libvirt 1.2.4 and qemu 2.1 on a 3.14.27 kernel. I've found that > live migrating a relatively large VM (16 cores and 64G ram) is taking > forever - close to 15 hours now, and still not done... > > With "lsof -i", I can see a connection is established from my source > hypervisor to a target hypervisor, likely for the purpose of copying data. > nettop shows that this connection is constantly sending 50-60MBps traffic. > The VM being migrated has a disk on ceph by using librbd. > > I wonder if anyone has seen similar issues, and how I could troubleshoot > further. (I tried but failed to get qemu monitor to work on the VM...) > > Thanks. > -Simon > Hi, under certain conditions, like memory-intensive procedures inside guest, live migration effectively will have no end, and this is expected behavior. You may want to use --timeout parameter for fallback interval to non-live migration for example. If your vm is sitting idle, the observed behavior is most probably a bug.