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Hi *,

I posted my question in [1] a week ago, but no answer yet.

When does Nova apply its filters (Ram, CPU, etc.)?
Of course at instance creation and (live-)migration of existing  
instances. But what about existing instances that have been shutdown  
and in the meantime more instances on the same hypervisor have been  
launched?

When you start one of the pre-existing instances and even with RAM  
overcommitment you can end up with an OOM-Killer resulting in forceful  
shutdowns if you reach the limits. Is there something I've been  
missing or maybe a bad configuration of my scheduler filters? Or is it  
the admin's task to keep an eye on the load?

I'd appreciate any insights or pointers to something I've missed.

Regards,
Eugen

[1]  
https://ask.openstack.org/en/question/115812/nova-scheduler-when-are-filters-applied/