Am 30.01.2014 19:23, schrieb Neil Skrypuch: > First, let me briefly outline the way we use live migration, as it is > probably > not typical. We use live migration (with block migration) to make backups of > VMs with zero downtime. The basic process goes like this: > > 1) migrate src VM -> dest VM > 2) migration completes > 3) cont src VM > 4) gracefully shut down dest VM > 5) dest VM's disk image is now a valid backup > > In general, this works very well. > > Up until now we have been using qemu-kvm 1.1.2 and have not had any issues > with the above process. I am now attempting to upgrade us to a newer version > of qemu, but all newer versions I've tried occasionally result in the virtio- > net device ceasing to function on the src VM after step 3.
While I don't know this particular symptom, I can definitely tell you that migrating from qemu-kvm to qemu is bound to fail unless you enable at least a version_id change in piix4.c, possibly also in kvmvapic.c. Such errors would lead to migration not successfully completing though, with cryptic error on the dest side. Regards, Andreas -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
