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Here is my nova.conf settings for the parameters mentioned: cpu_allocation_ratio=32.0

available_filters=nova.scheduler.filters.all_filters enabled_filters=RetryFilter,ComputeFilter,ImagePropertiesFilter,CoreFilter,SameHostFilter,ServerGroupAffinityFilter

And I also discovered another related problem. I tried to scale down one of the instance from 8 cpu to 4 cpu. And I got the same error: No valid host is found.

How can I determine what the nova conductor is complaining?

Many Thanks