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I followed this link for my live migration setup. It worked fine.

Initially, I too faced the same UID/GID issue. In your case, Double check the UID / GID of nova and libvirt-qemu should be same in the both compute nodes. It may show the UID you are trying to assign is already in use. In that case, pick any one common unused UID from both the compute node and assigned it commonly in both the compute nodes.

Also, check the /var/lib/nova/ file and its owner & permission. Since you have changed the UIDs, there might be some chances for the nova UID is assigned to any other services that will get reflect in the file permission.

Thanks, Vinoth