Re: Fwd: strange strange problem! (please help!!)

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Thanks, doing a tar jcvf right now....

I will be looking into using rsync -- sparse files may be a problem, of course!

Thanks and best wishes!

--- James Wilkinson <james@xxxxxxxxxxxxxxxxxxx> wrote:

> David Hoffman wrote:
> > I'm honestly not sure how you would find out. I am guessing about this
> > theory, but here's what I'm thinking. Your original filespace...
> > "/usr/local/me" could theoretically contain a symlink. Let's say for
> > example, there is a symlink called "data" that points to some space on
> > a different filesystem.
> > 
> > Then when you run your du -sm on /usr/local/me, it might not tell you
> > the REAL space used if you were to copy, but instead only count
> > several bytes for the symlink.
> 
> For completeness, the other option is sparse files.
> 
> When Unix (or a compatible system like Fedora) is asked to create a file
> which has huge amounts of (binary) zero in it, it can be set to just
> record the fact that most of the file is zero, and store those blocks
> which aren't all zero. This is a sparse file.
> 
> This is under application control: it has to write the file the right
> way.
> 
> For example,
> 
> [james@howells scratch]$ du -k sparse
> 488     sparse
> [james@howells scratch]$ ls -lk sparse
> -rw-rw-r--  1 james james 500000 Jan 22 20:08 sparse
> 
> a file that takes 488K on disk, but is actually 500MB (ish) large.
> 
> When you copy a sparse file with some utilities, they will write out a
> non-sparse file that really does have 500 MB (or whatever) of zeros, and
> takes up 500MB of disk space.
> 
> The Original Poster may want to investigate this web page:
> http://rimuhosting.com/howto/rsync.jsp
> 
> James.
> 
> -- 
> James Wilkinson       | "!" sez I.  And "?".  After a few speechless seconds
> Exeter    Devon    UK | I come out with "%^&*".  Unless I come up with
> E-mail address: james | something plausible soon I'm going to run out of
> @westexe.demon.co.uk  | special characters.  -- Ben at lspace.org
> 
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