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As of now - I didn't find any built-in, automatical way to do that.

There's a method (api call)- evacuate, which allows to manually cold-migrate all vms from one host to another. But, it requires some external entity to call it (some kind of script or management system). And, as far as I know, in Icehouse there's particular problem with that - machines can be evacuated only when correctly shutdown. And, this is definitely not the case when node fails - all vms will be in error state. I read some blueprint, which pointed, that this behavior could hopefully be solved in Juno - but I didn't have a chance to verify this change.