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I did this experiment: on VM I started watching a video on youtube. While video was in progress I started migration. Migration did not complete until video was not finished.

I did another experiment: I installed a web server on VM. I then started an httperf stress test. As before migration did not complete until the stress test was closed.

Is this normal?

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Yes, I'd consider this to be normal (depending on what network equipment you're using).

Live migration requires that the entire contents of the VM's RAM be synchronized between hosts. If there is a high rate of change in RAM contents during the migration, synchronization may never complete, or may take a very long time.

If you're currently using 1G uplinks, you may consider upgrading to 10G NICs and a 10G switch.

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