Hacker News Reader

OK, so we just reject those demands?

We can't reject as it'll be used in the commercial application with users paying money for using cloud resources.

Basically what is needed is to find the list of VM migrations needed to be done to free enough space for a new VM (of course, if it's ever possible).

Yes, my question was: What to do when it's not possible? Put it on hold or reject it or automatically buy new servers?

Yes, completely reject if it's not possible at all.