On Thu, 21 Feb 2002, David Talkington wrote:

> Ah, grasshopper, you've discovered one of the seventh wonders of the 
> world -- the 'masking' effect when one filesystem is mounted on top of 
> another.  :-)
> 
> You can get the same effect with any mount, local or nfs.  If you fill 
> /usr/local with stuff, then mount some other partition on 
> /usr/local, you now have access to the stuff on the new partition -- 
> but the stuff on the "real" /usr/local is hidden, inaccessible to you 
> or anyone else until you umount the mounted filesystem.  It's still 
> there, obviously, as you saw ... there's just no access path to it.

although with this release of red hat (7.2), those processes that
had open files "underneath" the new mount point still have access
to those files.

rday



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