[Dirvish] examining disk space usage per image...need script or rsync parameter

[Richard Geoffrion]

but I'm trying to make it easy to see what is was that got backed up and 
how much disk space it is eating up.  When there are so many 
'brazilian'(sic) files in an image, it's hard to find out what changed.

Now... I originally composed the message  below..and I'm still curious 
about why DU works that way..but in finishing the last message I had the 
inspiration to look at the dirvish logs.  I see now that $image/log.gz 
contains the files that were RSYNC'ed for each image.  Does anyone have 
a script that reports file sizes of the files rsync'ed in a given image 
or is there a way to have dirvish add that to the log?


---originally composed  message---
Subject: 'du' disk space reporting weirdness

This may be off topic..as it is probably more a general admin question 
than a dirvish specific one.

I know what I'm seeing, but I don't know what it's called...so I don't 
know what to GOOGLE for.... I don't even know what I'm asking so I'll 
just have to explain what I see.

Here goes:
'du' calculates disk space correctly if I check the size of all of the 
vaults

----
    root at gwibkp:/banks/bugsbunny# du --max-depth=1 -h
    1.1M     ./gwifs-boot
    84G     ./gwifs-home
    18G     ./gwifm
    3.5G    ./gwifs-root
  <snip>
    6.0G    ./gwiadp-d
    167G    .
----

'du' even calculates correctly when I check the size of each image

----
    root at gwibkp:/banks/bugsbunny/gwifs-home# du --max-depth=1 -h
    20K     ./dirvish
    43G     ./2005-04-07
    6.6G    ./2005-06-01
    3.1G    ./2005-07-01
    3.8G    ./2005-08-01
    <snip>

----

But if I go into the image directory.. 'du' calculates ALL of the disk 
space of every hardlink and sums it together!

----
root at gwibkp:/banks/bugsbunny/gwifs-home/2005-06-01# du --max-depth=1 -h
41G     ./tree
41G     .
----


why do the first two examples calculate the size of the files that 
represent the hard links  and the last example calculates the actual 
disk space used BY the hard links?

What am I asking?