Use os-hosts API to get usage for the specified host:
Host: localhost.localdomain@lvmdriver-1, result is right.
$ curl -g -i -X GET http://192.168.153.129/volume/v3/d01ec9caf63a4211a7ab47bea3e489e7/os-hosts/localhost.localdomain@lvmdriver-1 -H "Accept: application/json" -H "User-Agent: python-cinderclient" -H "X-Auth-Token: $yenai"
HTTP/1.1 200 OK
Date: Sun, 15 Sep 2019 02:13:48 GMT
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_wsgi/3.4 Python/2.7.5
x-compute-request-id: req-a939cde3-3ba3-40bf-91a9-2e0f5ecab237
Content-Type: application/json
Content-Length: 391
OpenStack-API-Version: volume 3.0
Vary: OpenStack-API-Version
x-openstack-request-id: req-a939cde3-3ba3-40bf-91a9-2e0f5ecab237
Connection: close
{"host": [{"resource": {"volume_count": "1", "total_volume_gb": "10", "total_snapshot_gb": "0", "project": "(total)", "host": "localhost.localdomain@lvmdriver-1", "snapshot_count": "0"}}, {"resource": {"volume_count": "1", "total_volume_gb": "10", "total_snapshot_gb": "0", "project": "5ba12d15b6894997bd74993e024df02a", "host": "localhost.localdomain@lvmdriver-1", "snapshot_count": "0"}}]}
Host: localhost.localdomain@yenai-lvm, result is right.
$ curl -g -i -X GET http://192.168.153.129/volume/v3/d01ec9caf63a4211a7ab47bea3e489e7/os-hosts/localhost.localdomain@yenai-lvm -H "Accept: application/json" -H "User-Agent: python-cinderclient" -H "X-Auth-Token: $yenai"
HTTP/1.1 200 OK
Date: Sun, 15 Sep 2019 02:14:10 GMT
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_wsgi/3.4 Python/2.7.5
x-compute-request-id: req-cd66f6e4-5db1-4826-94ab-0ef5c3c20565
Content-Type: application/json
Content-Length: 585
OpenStack-API-Version: volume 3.0
Vary: OpenStack-API-Version
x-openstack-request-id: req-cd66f6e4-5db1-4826-94ab-0ef5c3c20565
Connection: close
{"host": [{"resource": {"volume_count": "9", "total_volume_gb": "9", "total_snapshot_gb": "1", "project": "(total)", "host": "localhost.localdomain@yenai-lvm", "snapshot_count": "1"}}, {"resource": {"volume_count": "6", "total_volume_gb": "6", "total_snapshot_gb": "1", "project": "5ba12d15b6894997bd74993e024df02a", "host": "localhost.localdomain@yenai-lvm", "snapshot_count": "1"}}, {"resource": {"volume_count": "3", "total_volume_gb": "3", "total_snapshot_gb": "0", "project": "d01ec9caf63a4211a7ab47bea3e489e7", "host": "localhost.localdomain@yenai-lvm", "snapshot_count": "0"}}]}
Host: localhost.localdomain, result is wrong. ★★★★★
$ curl -g -i -X GET http://192.168.153.129/volume/v3/d01ec9caf63a4211a7ab47bea3e489e7/os-hosts/localhost.localdomain -H "Accept: application/json" -H "User-Agent: python-cinderclient" -H "X-Auth-Token: $yenai"
HTTP/1.1 200 OK
Date: Sun, 15 Sep 2019 02:14:30 GMT
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.2k-fips mod_wsgi/3.4 Python/2.7.5
x-compute-request-id: req-525f04e8-dcec-4cb2-adb4-a148c27b85a4
Content-Type: application/json
Content-Length: 367
OpenStack-API-Version: volume 3.0
Vary: OpenStack-API-Version
x-openstack-request-id: req-525f04e8-dcec-4cb2-adb4-a148c27b85a4
Connection: close
{"host": [{"resource": {"volume_count": "1", "total_volume_gb": "10", "total_snapshot_gb": "0", "project": "(total)", "host": "localhost.localdomain", "snapshot_count": "0"}}, {"resource": {"volume_count": "1", "total_volume_gb": "10", "total_snapshot_gb": "0", "project": "5ba12d15b6894997bd74993e024df02a", "host": "localhost.localdomain", "snapshot_count": "0"}}]}
Reason：
cinder/api/contrib/hosts.py
# Not found exception will be handled at the wsgi level
host_ref = objects.Service.get_by_host_and_topic(
context, host, constants.VOLUME_TOPIC) ★★★★★ will return the first host(in this case is just localhost.localdomain@lvmdriver-1)!
Even if you get it, the exist methods volume_get_all_by_host and volume_data_get_for_host also can not deal with it! The filter conditions just miss the host level.
