Comment 15 for bug 1768231

Same error here. I'm not entirely sure what fixed it, I don't think it was a simple restart, but I also renamed by volume_backend_name in one of them during this last run of os-cinder-install.yml, and now it seems to work? Very strange.

Changed from rbddriver and rbddriver_nvme to rbddriver and nvmedriver (I thought maybe the _ was causing an issue).

Somehow it could've been the extra restart, the fact I changed volume_backend_name, or a miracle, but it's oddly working now.