[libvirt] unable to set security context (NFSv4 problem?)

Hi folks, Since I have moved the image file of a domain to an NFS partition I get an error message at start time: # virsh start mydomain error: Failed to start domain mydomain error: unable to set security context '110:140' on '/storage/mydomain/vda.img': Invalid argument The /storage partition is mounted with these options: # cat /proc/mounts | grep /storage nasl002:/storage/ /storage nfs4 rw,relatime,vers=4,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=172.19.96.31,addr=172.19.96.213 0 0 If I use a local disk instead, then there is no such problem. libvirt is version 0.7.7-4, as included with Debian. Any helpful comment would be highly appreciated. Regards Harri