A frequent issue with cinder volumes is failures to removing them. If you tried to do cinder delete $volume_id and got an "error_deleting"  here is a short way to quickly solve this issue and save your time :).

In order to solve this issue try using the cinder force-delete command, which bypasses some checks.

 if you're sure the volume isn't there anymore and there are no references to it (eg. in /etc/cinder/volumes), you can hack into the database and delete it from the volumes_metadata and volumes tables.

Further details can be found in this article

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