NFS and umount -f

[Andy]

Why does this NOT do what is should be doing, i.e. umount no matter what?

Sometimes I get 

umount2 : Stale NFS file handle
umount : machine/path: Illegal seek

and it does not umount it.

What part of
 -f "Force unmount (in case of unreachable NFS system)" (umount man page)

does linux not understand?

shouldn't umount -f umount no matter what?

Andy

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