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I was able to complete the live migration successfully.

There could be possibly 2 reasons that could have caused the above issues while performing live migration of vm's:

  1. The uid/gid of nova, quantum, nfs etc were different on the 2 compute nodes

  2. The compute nodes had different CPU configuration.

What I have done now is:

  1. The 2 compute noded has the same CPU configuration
  2. Copied the /etc/passwd file from controller to the 2 compute nodes and then installed any services. This ensured al l the compute noded has the same uid/gid.

Thanks Ramkumar Raghavan