Hi,
Hope this will help you :
nova hypervisor-stats
It will return the statistics of the Hypervisor node example,
+----------------------+-------+
| Property | Value |
+----------------------+-------+
| count | 2 |
| current_workload | 0 |
| disk_available_least | 1378 |
| free_disk_gb | 1606 |
| free_ram_mb | 47003 |
| local_gb | 1606 |
| local_gb_used | 0 |
| memory_mb | 48027 |
| memory_mb_used | 1024 |
| running_vms | 0 |
| vcpus | 28 |
| vcpus_used | 0 |
+----------------------+-------+
转自: https://ask.openstack.org/en/question/1123/how-to-see-the-real-available-resources/