Hi!

Below is the output:

[cloudadmin@controller-1 ~(admin)]$ openstack server add volume cirros-01 tst-volume
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$ cinder --os-volume-api-version=3.27 attachment-list --volume-id=df03bb89-7383-4d21-bc67-1da89b9fa1cf
+--------------------------------------+--------------------------------------+----------+-----------+
| ID                                   | Volume ID                            | Status   | Server ID |
+--------------------------------------+--------------------------------------+----------+-----------+
| e7e2fda8-b742-46c5-a758-3559c923d1cb | df03bb89-7383-4d21-bc67-1da89b9fa1cf | attached |           |
+--------------------------------------+--------------------------------------+----------+-----------+
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$ cinder --os-volume-api-version=3.27 attachment-show e7e2fda8-b742-46c5-a758-3559c923d1cb
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| attach_mode | rw                                   |
| attached_at | 2018-09-27T04:46:00.000000           |
| detached_at |                                      |
| id          | e7e2fda8-b742-46c5-a758-3559c923d1cb |
| instance    | cd8d1af1-24ec-4539-bdc6-82bdd6988851 |
| status      | attached                             |
| volume_id   | df03bb89-7383-4d21-bc67-1da89b9fa1cf |
+-------------+--------------------------------------+
+--------------------+--------------------------------------------------------+
| Property           | Value                                                  |
+--------------------+--------------------------------------------------------+
| access_mode        | rw                                                     |
| attachment_id      | e7e2fda8-b742-46c5-a758-3559c923d1cb                   |
| auth_enabled       | True                                                   |
| auth_username      | cinder                                                 |
| cluster_name       | ceph                                                   |
| discard            | True                                                   |
| driver_volume_type | rbd                                                    |
| encrypted          | False                                                  |
| hosts              | [u'192.168.12.21', u'192.168.12.25', u'192.168.12.26'] |
| keyring            | None                                                   |
| name               | volumes/volume-df03bb89-7383-4d21-bc67-1da89b9fa1cf    |
| ports              | [u'6789', u'6789', u'6789']                            |
| qos_specs          | None                                                   |
| secret_type        | ceph                                                   |
| secret_uuid        | ba484b64-4de7-47cf-8af0-96abfbec84cd                   |
| volume_id          | df03bb89-7383-4d21-bc67-1da89b9fa1cf                   |
+--------------------+--------------------------------------------------------+
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$ openstack server migrate --live compute-1 --block-migration cirros-01
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$ cinder --os-volume-api-version=3.27 attachment-list --volume-id=df03bb89-7383-4d21-bc67-1da89b9fa1cf
+--------------------------------------+--------------------------------------+----------+-----------+
| ID                                   | Volume ID                            | Status   | Server ID |
+--------------------------------------+--------------------------------------+----------+-----------+
| 5521bb31-9eab-4062-9778-488a614141e5 | df03bb89-7383-4d21-bc67-1da89b9fa1cf | attached |           |
+--------------------------------------+--------------------------------------+----------+-----------+
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$ cinder --os-volume-api-version=3.27 attachment-show 5521bb31-9eab-4062-9778-488a614141e5
+-------------+--------------------------------------+
| Property    | Value                                |
+-------------+--------------------------------------+
| attach_mode | rw                                   |
| attached_at | 2018-09-27T04:50:00.000000           |
| detached_at |                                      |
| id          | 5521bb31-9eab-4062-9778-488a614141e5 |
| instance    | cd8d1af1-24ec-4539-bdc6-82bdd6988851 |
| status      | attached                             |
| volume_id   | df03bb89-7383-4d21-bc67-1da89b9fa1cf |
+-------------+--------------------------------------+
+--------------------+--------------------------------------------------------+
| Property           | Value                                                  |
+--------------------+--------------------------------------------------------+
| access_mode        | rw                                                     |
| attachment_id      | 5521bb31-9eab-4062-9778-488a614141e5                   |
| auth_enabled       | True                                                   |
| auth_username      | cinder                                                 |
| cluster_name       | ceph                                                   |
| discard            | True                                                   |
| driver_volume_type | rbd                                                    |
| encrypted          | False                                                  |
| hosts              | [u'192.168.12.21', u'192.168.12.25', u'192.168.12.26'] |
| keyring            | None                                                   |
| name               | volumes/volume-df03bb89-7383-4d21-bc67-1da89b9fa1cf    |
| ports              | [u'6789', u'6789', u'6789']                            |
| qos_specs          | None                                                   |
| secret_type        | ceph                                                   |
| secret_uuid        | ba484b64-4de7-47cf-8af0-96abfbec84cd                   |
| volume_id          | df03bb89-7383-4d21-bc67-1da89b9fa1cf                   |
+--------------------+--------------------------------------------------------+
[cloudadmin@controller-1 ~(admin)]$
[cloudadmin@controller-1 ~(admin)]$ openstack volume list --long
+--------------------------------------+------------+--------+------+------+----------+------------------------------------+------------+
| ID                                   | Name       | Status | Size | Type | Bootable | Attached to                        | Properties |
+--------------------------------------+------------+--------+------+------+----------+------------------------------------+------------+
| df03bb89-7383-4d21-bc67-1da89b9fa1cf | tst-volume | in-use |    1 | None | false    | Attached to cirros-01 on /dev/vdb  |            |
+--------------------------------------+------------+--------+------+------+----------+------------------------------------+------------+
[cloudadmin@controller-1 ~(admin)]$