Hi,
I currently have a couple of Debian KVM servers with all a different
version of kvm or qemu-kvm.
I can live migrate a guest OS from one server to the other just fine, as
long as the version of qemu-kvm is the same. (Thanks to Gleb Natapov who
helped me solve my ARP announce problem yesterday)
However, when I try to migrate a guest to a server running a newer (or
older) version of qemu-kvm, I run into problems. I think this is because
the xml configuration differs slightly between version.
For example, if I try to migrate from a server running qemu-kvm 0.11.0
to one running qemu-kvm 0.12.4, I get the following error:
virt01:~# virsh migrate --live testserver qemu+ssh://192.168.1.7/system
error: internal error unable to reserve PCI address 0:0:3
When migrating from kvm 85 to qemu-kvm 0.11.0:
virt02:~# virsh migrate --live testserver qemu+ssh://192.168.1.2/system
error: Unknown failure
Migrating one from 0.12.4 to 0.11.0 just completely breaks libvirt,
forcing me to kill -9 libvirtd and the kvm instance, etc.
I believe this is caused in part because different versions of qemu-kvm
need different xml configurations. To run my testserver on 0.12.4 for
example, I need to delete the lines with the PCI id's, just to be able
to start the it.
So, is there a way to make this work? Perhaps without libvirt? Or tell
libvirt to not send the config file when doing a live migrate, and use
the xml in /etc/libvirt/qemu instead somehow?
Thanks in advance,
Nils
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