apparently dummy should not be allowed for eph disk
instead of let boot process check it ,API layer may do a better check on it
[root@controller ~]# nova boot --flavor 21 --key_name mykey --image 43ca519b-979b-4803-95ad-b9f160f1a337 --security_group default --ephemeral size=1,format=dummy test13
+--------------------------------------+--------------------------------------+
| Property | Value |
+--------------------------------------+--------------------------------------+
| OS-EXT-STS:task_state | scheduling |
| image | CirrOS 0.3.1 golden |
| OS-EXT-STS:vm_state | building |
| OS-EXT-SRV-ATTR:instance_name | instance-00000047 |
| OS-SRV-USG:launched_at | None |
Hrm aren't the valid values going to be rather dependent on the backend implementation?