[libvirt-users] live migration taking forever

[Brian Rak]

If the guest is modifying memory faster then your network connection can 
sync it, the migration will never finish.

I've worked around this in the past by running 'virsh suspend' on the 
source host.  This will temporarily stop the guest, and allow the 
migration to finish.

On 1/22/2015 1:11 PM, Xu (Simon) Chen 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
>
>
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