http://docs.openstack.org/admin-guide/compute-flavors.html


# openstack flavor set IWINV.OCTA --property quota:disk_io_reservation=2000
# nova flavor-show IWINV.OCTA
+----------------------------+---------------------------------------+
| Property                   | Value                                 |
+----------------------------+---------------------------------------+
| OS-FLV-DISABLED:disabled   | False                                 |
| OS-FLV-EXT-DATA:ephemeral  | 0                                     |
| disk                       | 25                                    |
| extra_specs                | {"quota:disk_io_reservation": "2000"} |
| id                         | c0063d60-9634-4952-bd65-42888b315621  |
| name                       | IWINV.OCTA                            |
| os-flavor-access:is_public | True                                  |
| ram                        | 16384                                 |
| rxtx_factor                | 1.0                                   |
| swap                       |                                       |
| vcpus                      | 8                                     |
+----------------------------+---------------------------------------+