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nova hypervisor-stats negative values

Hi,

Before a deploy, our "nova hypervisor-list" is ok

+----------------------+---------+
| Property             | Value   |
+----------------------+---------+
| count                | 9   |
| current_workload     | 1   |
| disk_available_least | 2893    |
| free_disk_gb         | 3171    |
| free_ram_mb          | 1015808 |
| local_gb             | 3171    |
| local_gb_used        | 40  |
| memory_mb            | 1015808 |
| memory_mb_used       | 4096    |
| running_vms          | 1   |
| vcpus                | 192     |
| vcpus_used           | 1   |
+----------------------+---------+

But at some point, the result is strange and finnaly fail the deploiement :

+----------------------+-------+
| Field                | Value |
+----------------------+-------+
| count                | 9     |
| current_workload     | 9     |
| disk_available_least | -3449 |
| free_disk_gb         | 0     |
| free_ram_mb          | 0     |
| local_gb             | 0     |
| local_gb_used        | 360   |
| memory_mb            | 0     |
| memory_mb_used       | 36864 |
| running_vms          | 9     |
| vcpus                | 0     |
| vcpus_used           | 9     |
+----------------------+-------+

Why is this happening ?

We are in Newton Openstack.