[ceph-users] Can not mount rbd device anymore

Hello List, oversudden i can not mount a specific rbd device anymore: root@proxmox-backup:~# rbd map backup-proxmox/cluster5 -k /etc/ceph/ceph.client.admin.keyring /dev/rbd0 root@proxmox-backup:~# mount /dev/rbd0 /mnt/backup-cluster5/ (just never times out) Any idea how to debug that mount? Tcpdump does show some active traffic. Cheers, Michael