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Symptoms..블록 스토리지를 삭제하는 과정에서 아래와 같은 에러가 발생.rbd: error: image still has watcherslibrbd::image::RemoveRequest: 0x55ce6659a5c0 check_image_watchers: image has watchers - not removingRemoving image: 0% complete...failed.rbd: error: image still has watchersThis means the image is still open or the client using it crashed. Try again after closing/unmapping it or waiting 30s for the crashed client to t..

Symptoms../etc/nova/nova-compute.log 를 보면 block에 대해 error connecting: permission denied가 뜬다.qemu-kvm: -blockdev {"driver":"rbd","pool":"volumes","image":"volume-29a2f487-1ba9-48b3-b3ac-3b675be1e770","server":[{"host":"[mon0]","port":"6789"},{"host":"[mon1]","port":"6789"},{"host":"[mon2]","port":"6789"}],"user":"cinder","auth-client-required":["cephx","none"],"key-secret":"libvirt-1-storage-auth..