Hi, as you might already know I try to use ceph with openstack in an oVirt test environment. I'm able to create and remove volumes. But if I try to run a VM which contains a ceph volume it is in the "Wait for launch" state for a very long time. Then it gets into "down" state again. The qemu log states 2018-05-25T15:03:41.100401Z qemu-kvm: -drive file=rbd:rbd/volume-3bec499e-d0d0-45ef-86ad-2c187cdb2811:id=cinder:auth_supported=cephx\;none:mon_host=[mon0]\:6789\;[mon1]\:6789,file.password-secret=scsi0-0-0-0-secret0,format=raw,if=none,id=drive-scsi0-0-0-0,serial=3bec499e-d0d0-45ef-86ad-2c187cdb2811,cache=none,werror=stop,rerror=stop,aio=threads: error connecting: Connection timed out 2018-05-25 15:03:41.109+0000: shutting down, reason=failed On the monitor hosts I see traffic with the ceph-mon-port, but not on other ports (the osds for example). In the ceph logs however I don't really see what happens. Do you have some tips how to debug this problem? Regards Bernhard