Thanks for your reply. Well, I also run df command on my laptop(ubuntu 9 desktop edition), it also shows the mount point of /, similar to what you posted.

The server (ubuntu 8 server edition) uses on SCSI hard disk. Now i see that almost all the available space of /dev/sda3 is owed by 'gvfs-fuse-daemon /root/.gvfs'. So I guess this daemon is doing some tricky thing.

I am lost.