On 11/20/2019 1:02 PM, Albert Braden wrote: > The other symptom is that the scheduler will send single VMs to a full > hypervisor and overload it even though we have cpu_allocation_ratio and > ram_allocation_ratio set to 1: You're on Rocky correct? If allocation ratios are acting funky, you should read through this: https://docs.openstack.org/nova/rocky/admin/configuration/schedulers.html#bug-1804125 There were some changes in Stein to help with configuring nova to deal with allocation ratios per compute or via aggregate: https://docs.openstack.org/nova/latest/admin/configuration/schedulers.html#allocation-ratios But what you'll likely need to do is manage the allocation ratios in aggregate on the resource providers in placement. Fortunately there is a CLI for doing that: https://docs.openstack.org/osc-placement/latest/cli/index.html#resource-provider-inventory-set e.g. openstack resource provider inventory set <aggregate_uuid> --resource VCPU:allocation_ratio=1.0 --aggregate --amend Anyway, see if that documented bug with allocation ratios is your issue first and then go through the workarounds. -- Thanks, Matt