Open Stack

Hi.
After I installed Cinder, I have had a problem which I cannot make
instances with volume storage.
I created an instance on Horizon and it always has failed.
Actually, I'm using Xen as the hypervisor and there was not any special log
about Nova.
But, in the Xen's log (/var/log/xen/bootloader.5.log), I saw the hypervisor
cannot find the volume which is provided by Cinder:

Traceback (most recent call last):
>   File "/usr/lib/xen/bin/pygrub", line 929, in <module>
>     raise RuntimeError, "Unable to find partition containing kernel"
> RuntimeError: Unable to find partition containing kernel


And, I also found something noticeable in the Cinder's log
('/var/log/cinder/cinder-volume.log' on the Block storage node):

2018-12-31 04:08:11.189 12380 INFO cinder.volume.manager
> [req-93eb0ad3-6c6c-4842-851f-435e15d8639b bb1e571e4d64462bac80654b153a88c3
> 96ad10a59d114042b8f1ee82c438649a - default default] Attaching volume
> 4c21b8f1-ff07-4916-9692-e74759635978 to instance
> bea7dca6-fb04-4791-bac9-3ad560280cc3 at mountpoint /dev/xvda on host None.


It seems that Cinder cannot receive information of the target node ('on
host None' above) so, I think it can cause the problem that Cinder fails to
provide the volume due to lack of the host information.
Since I could not find any other logs except that log, I need more hints.
Please give me some help

Thanks!
Regard,
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