/usr/src/modules/unionfs/INSTALL (on sarge) says: > * If you want to export Unionfs over NFS, then you need to add > extra information to /etc/exports. knfsd will not export Unionfs > unless > you have an fsid option in /etc/exports. This is because Unionfs has > no > real device. See man exports(5) for more information on fsid. > -- eudoxos