Very Computer

The prelude:

I've several DS20, with 4.0F version, wich exports an specific
directory by NFS. I've a 500au Workstation, with 4.0F too, wich import
the specific directory from one of the servers in a concrete mounting
point.

options of the mount command: rw, bg, noac, soft

The *:

If I shutdown the DS20 server or if I take out the ethernet from it, my
Workstation try to umount (with -f option) the directory but this
command hangs. If I execute a "df" command, it hangs for several
minutes and finally returns all mounted points except the NFS point
but....
If I try to mount, in the same point of the Workstation, the NFS
directory of another (visible) server, I can't do it because the mount
point is still in use. Probably the first umount command did not work
so....

The question:

How can I umount the NFS directory in the workStation when the servers
fail down or its network doesn`t work? or
How can I mount in the same mounting point of the Workstation another
directory from another server)

Thanks

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Before you buy.

    I think problem is in processes that have open files or/and working
directoreis inside mounted filesystem. Try fuser -c, then remove prcesses
(or kill them, or try fuser -ck). After all that stuff try umount -f. I
hope it solve Your problem

    Tomasz Gaska