Tuesday, 12 August 2014

What is "Migrating The Active State of VM"

We had a server at work that was practically locked up. It had very high CPU load.

It was a virtual server so checking vSphere showed the message "Migrating the Active State of VM".

It was doing a vmotion from one host to another.

We actually thought at first that the vmotion was inducing the high cpu load. But, of course, vmotion doesn't do this. The end user should be oblivious to it. There should be no overhead.

It turned out that the VM was being constantly vmotioned around because of it's high cpu load. In the end, we rebooted it, whatever had been the source of the problem was no more and the vmotions stopped.

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