Looks like it is caused by following bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1071733
Local testing shows that local filesystems work ok, they do not overlap anyhow. But mounting them as NFS shares makes them refer to one single volume.
Looks like it is caused by following bug: https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1071733
Local testing shows that local filesystems work ok, they do not overlap anyhow. But mounting them as NFS shares makes them refer to one single volume.