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/


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