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   Newsgroups: alt.os.linux.ubuntu   
   From: Sybren Stuvel    
   Subject: Re: Question about mount command and location of files   
   References:   <54pnb4F21pso3U1@mid.individual.net>   
      
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   Chris Fasano enlightened us with:   
   >   
   > Thank you.  This explanation is (somewhat) what's causing my   
   > misunderstanding.  If files aren't physically moved by mounting, then if I   
   > create a directory under hda1 (home/newdirectory) the /newdirectory is   
   > physically located on hda.   
   >   
   > So why would any files now created under /newdirectory be physically   
   > located on hdb just because I mounted /dev/hdb1 to /home/newdirectory,   
   > since as you say "mounting does not shift files physically?"   
      
   Let me try to explain. Let's assume that hda1 contains your root   
   filesystem, like this:   
      
   Filesystem:         Physical:   
   /                   /        on hda1   
   /etc                /etc     on hda1   
   /home               /home    on hda1   
   /usr                /usr     on hda1   
      
   Let's say you now mount hda2 on /home and you mkdir /home/somedir.   
   Your filesystem now looks like this:   
      
      
   Filesystem:         Physical:   
   /                   /        on hda1   
   /etc                /etc     on hda1   
   /home               /        on hda2   
   /home/somedir       /somedir on hda2   
   /usr                /usr     on hda1   
      
   Because you mounted hda2 on /home, the root of hda2 is available at   
   /home. Files in /home/somedir thus reside on hda2.   
      
   Still with me so far? I hope so.   
      
   If you unmount hda2, and re-mount it on /usr, your filesystem looks   
   like this:   
      
   Filesystem:         Physical:   
   /                   /        on hda1   
   /etc                /etc     on hda1   
   /home               /home    on hda1   
   /usr                /        on hda2   
   /usr/somedir        /somedir on hda2   
      
   The files in /home/somedir have now moved to /usr/somedir because of   
   the remounting. However, they are still in the same physical location,   
   /somedir on hda2. That is what's ment with "mounting does not shift   
   files physically".   
      
   Sybren   
   --    
   Sybren Stüvel   
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