DCN Cinder schedule allocate volume: Could not find any available weighted backend on new AZ

Solution In Progress - Updated -

Issue

  • Unable to spawn volumes to new Availability Zone in DCN architecture
$ cinder --os-volume-api-version 3.3 message-list
...
| 0cbbb361-af24-4906-9165-338cd121abb2 | VOLUME        | 10d63fbd-d734-47d9-a78b-19cd26034d47 | VOLUME_VOLUME_001_003 | schedule allocate volume:Could not find any available weighted backend. |
...
  • For context, below is the cinder-volume services (columns truncated for readability).
$ openstack volume service list
+------------------+--------------------------------------+------+
| Binary           | Host                                 | Zone |
+------------------+--------------------------------------+------+
| cinder-scheduler | pocxyz-az1-controller-0              | az1  |
| cinder-scheduler | pocxyz-az1-controller-2              | az1  |
| cinder-scheduler | pocxyz-az1-controller-1              | az1  |
| cinder-volume    | hostgroup@tripleo_ceph               | az1  |
| cinder-volume    | pocxyz-az2-computeaz2-0@tripleo_ceph | az2  |
| cinder-volume    | pocxyz-az2-computeaz2-1@tripleo_ceph | az2  |
| cinder-volume    | pocxyz-az2-computeaz2-2@tripleo_ceph | az2  |
| cinder-volume    | pocxyz-az3-computeaz3-0@tripleo_ceph | az3  |
| cinder-volume    | pocxyz-az3-computeaz3-2@tripleo_ceph | az3  |
| cinder-volume    | pocxyz-az3-computeaz3-1@tripleo_ceph | az3  | 
+------------------+--------------------------------------+------+

Environment

  • Red Hat OpenStack Platform 16.1
  • Distributed Compute Nodes with Storage
  • Cinder Active/Active in multiple AZs

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