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Here you have to take into consideration what storage backend you are using for the cinder volumes. If you are using as backend lvms on controllers it is normal that if one controller goes down you can not anymore use the volumes created on that controller. If you cannot bring up anymore the controller than you just delete the corresponding volumes records directly from the cinder database.

On the other hand, if you are using high available storage (like ceph or glusterfs) if a controller goes down the information from the volume (the block device) still exists but in the cinder database is still associated to the controller that went down. What you can do to manage the volume is to change the value of parameter host in the table volumes from the database cinder from the old controller to the new controller.