On Monday 08 February 2010 20:22:44 Lance Albertson wrote:
On Fri, Feb 05, 2010 at 03:21:32PM -0500, Thomas Sjolshagen wrote:
is anyone using libvirt-git and qemu-kvm post-0.11 and can live migrate VMs successfully for- and backwards? qemu-kvm-0.11 seems to be the latest release were live migration works, and I'm trying to figure out if its a kvm or libvirt problem, since there were other things (balloon parameter f.e.) that were changed with qemu-kvm-0.12 and caused troubles when using libvirt.
Yes.
I'm using the virt-preview repo (rawhide) and I just noticed, today, after re-upgrading to 0.12.2-5 (since -4 has a rather nasty IO problem for virtio devices against raw image files) that my live-migrations fail with the following error message on the destination system (i.e. the system the I'm trying to migrate to):
/var/log/libvirt/qemu/<guest>.log: Unknown savevm section -2038417646 load of migration failed
This looks like a new QEMU bug to me
I can confirm this bug is happening on Ganeti as well [1]. It appears that if you sync the time on the guest VM before migrating back to the other node it will "succeed" most of the time. Has anyone opened a bug for this on the qemu-kvm bug tracker yet? I was about to do that myself.
Using acpi_pm as clocksource on both guests and hosts seems to fix it for now. (For guests, clocksource=acpi_pm on kernel cmdline) -t