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
Further details can be found in this article