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Thank you for your reply.

I initialized migration with:

nova live-migration instance_name host_name

and

nova live-migration instance_id host_name

When initiating these commands instance hangs for a second and then resumes to operate on the same (source) nod.

I have all host names in /etc/hosts and nods are pingable. Firewall and AppArmor are disabled. Shared storage is NFS v4 with no_root_squash and it is writable with users root and openstack-nova. I also did chmod o+x on /var/lib/nova/instances as instructed and I tried to run Qemu as root, but the same problem persists.