[libvirt-users] live migration taking forever

[Andrey Korolyov]

On Thu, Jan 22, 2015 at 9:11 PM, Xu (Simon) Chen <xchenum at gmail.com> 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.