> I hat do copy them to all the hosts to start a virtual machine with attached cinderlib ceph block device. 
That is strange, you shouldn't need to do this, cinderlib passes them to the hosts itself
Do you have cinderlib.log to look at? (/var/log/ovirt-engine/cinderlib/cinderlib.log)

On Mon, Jul 22, 2019 at 5:52 PM Mathias Schwenke <mathias.schwenke@uni-dortmund.de> wrote:
> Starting a VM should definitely work, I see in the error message:
> "RBD image feature set mismatch. You can disable features unsupported by
> the kernel with "rbd feature disable"
> Adding "rbd default features = 3" to ceph.conf might help with that.
Thanks! That helped.

https://ovirt.org/develop/release-management/features/storage/cinderlib-integration.html means:
> Also for Ceph backend, a keyring file and ceph.conf file is needed in the Engine.
I hat do copy them to all the hosts to start a virtual machine with attached cinderlib ceph block device.
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