I installed devstack on top of xenserver. Now I want to add a ubuntu image to openstack. I downloaded qcow2 image from here and used the guideline here to convert the image to vhd format and added to openstack using glance.

But when I start the instance, it got shut-off automatically. When I try to restart the instance in Xensenver, it got stuck at the messages:

[    1.612617] EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
[    2.245259] EXT4-fs (xvda1): re-mounted. Opts: (null)


One thing to mention is I successfully added a cirros image to xenserver using the steps above

So what's the problem here? Could any one give any suggestions?