[sheepdog] configuration for block storage on Openstack

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Hello

I try to adopt sheepdog as a block storage on Openstack.
It works well when create volume via command on controller node. 
root at controller:~# cinder list
+--------------------------------------+-----------+------------------+------------+------+-------------+----------+-------------+-------------+
|                  ID                  |   Status  | Migration Status |    Name    | Size | Volume Type | Bootable | Multiattach | Attached to |
+--------------------------------------+-----------+------------------+------------+------+-------------+----------+-------------+-------------+
| 12b96a0d-13be-40f1-9f1a-6175c1ec49fc | available |        -         |     ZZ     |  10  |      -      |  false   |    False    |             |

root at block1:~# dog vdi list
Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag   Block Size Shift
volume-12b96a0d-13be-40f1-9f1a-6175c1ec49fc     0   10 GB  0.0 MB  0.0 MB 2016-03-17 16:16   dd2055      3                22


But using create new volume as boot image on Horizon,  I got follow error.

'Block Device Mapping in Invaild.'

Please let me know detail configuration for block storage on Openstack.