cinder volumes stuck in 'creating' state with a NetApp backend

Issue

• cinder volumes are stuck in creating state but we can successfully delete existing volumes:

[stack@undercloud ~]$ cinder list
+--------------------------------------+----------------+----------------------------+------+-------------------------------+----------+-------------+
| ID                                   | Status         | Name                       | Size | Volume Type                   | Bootable | Attached to |
+--------------------------------------+----------------+----------------------------+------+-------------------------------+----------+-------------+
| 00a4004e-3ea3-4aae-921e-fe97752dac71 | creating       | testtt                     | 30   | NetApp                        | false    |             |
| 07d35cae-ab02-4ff6-9685-f7cea7ae921f | available      |                            | 70   | -                             | true     |             |
| 18e7fe0d-563b-492b-8469-edf3bb1c9fb4 | available      | testing_delete             | 80   | NetApp                        | true     |             |
+--------------------------------------+----------------+----------------------------+------+-------------------------------+----------+-------------+