Problems to configure ceph storage site with Virt-Manager

Hi everybody,

I have a POC with 2 KVM host servers and a ceph cluster standed by 3 OSDs and 1 monitor servers. Everything is working fine as I'm able to create VMs and then change the virtual HD to use one from RBD pool defined at Ceph cluster (via virsh edit).

The problem comes when I try to configure a new storage site in virt-manager for any of the KVM Servers for the ceph system: I always receive error "Operation not permitted"; I suspect it's a ceph auth problem but I'm unable to find the user used to connect to ceph monitor server by virt-manager, or maybe it's another problem/error by my side.

I have searched for virt-manager doc about ceph storage but I haven't found anything...

Any clue/help?

Thanks in advance

Jorge