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Here is what I use in my nova.conf:

scheduler_default_filters =  ComputeFilter, CoreFilter, RamFilter, SameHostFilter
ram_allocation_ratio = 1.5
cpu_allocation_ratio = 30.0

Here First check nova.conf on controller and computes for lingering mismatched region names (i.e. "RegionOne" everywhere, not "openstacl" or "regionOne").

I don't think it is what linked to allocation ratio, but I use found I needed to explicitly provide the scheduler filters when specifying a ratio in my nova.conf:

scheduler_default_filters =  ComputeFilter, CoreFilter, RamFilter, SameHostFilter
ram_allocation_ratio = 1.5
cpu_allocation_ratio = 30.0