I set disk_allocation_ratio to 10. Still, Nova says that there is not enough disk space on the compute nodes. For example:

$ nova hypervisor-show 1
+---------------------------+------------------------------------------+
| Property                  | Value                                    |
+---------------------------+------------------------------------------+
...
| disk_available_least      | -2                                       |
| free_disk_gb              | 3                                        |
...
| local_gb                  | 191                                      |
| local_gb_used             | 188                                      |

But the compute log on that node says there is plenty of space. Which is true:

2017-09-04 15:59:15.545 19177 DEBUG nova.compute.resource_tracker [req-ac2903a3-6922-483f-959a-7efaa6fd4e8f None None] Hypervisor/Node resource view: name=hos5-cp1-comp0003-mgmt free_ram=51487MB free_disk=183GB  .....

What am I missing?