Start the virtual machine from ISO image, prompt "No usable disks has been foun when installing OS"

"Problem phenomenon" through the OpenStack interface, the trial image centos6.5 minimal ISO image generation virtual machine instance, the cloud host type is M1.little, the virtual machine is installed after power on the OS, prompting "no Usbale disks have been found"

"Cause of the problem"

The resource configuration for the cloud host type M1.little is as follows:

| id                                     | Name          | memory_mb | disk | ephemeral | swap | vcpus  | rxtx_factor | is_public | |  a2895ca4-de0c-4dac-8ea1-7c7279b74b87 | m1.little    | 1024       | 20   | 0          |      | 1     | 1.0          | true      | 

When you start the virtual from an ISO image, OpenStack will use the Qcow image file generated by the root disk as the CDROM device as the startup source for installing the OS, not as a disk device to install the OS, causing the OS to be found without the disk "no usable disks have been Foudn "

"Workaround"

To set up a dedicated ISO cloud host type, you must set the temporary disk size as follows

| ID | Name | MEMORY_MB | Disk | Ephemeral | Swap | Vcpus | Rxtx_factor | Is_public | | b11eb720-6167-41f6-b7f2-668174478df0 | M1.medium | 4096 | 40 |      60 | | 2 | 1.0 | True |

When generating a virtual machine using an ISO image, select the cloud host type as the configuration template

Starting the virtual machine from ISO mirroring, prompting "no usable disks has been Foun

when installing OS"