Hello,
 
 In the situation you have described, if i understood well, you would not have 
any space. When you take a snapshot, your snapshot is referencing the blocks 
older than it...
 Ex.: 
 You have a 500gb disk, and create a 5gb file, you got 495gb free space. 
 So you delete the file, you have 500gb again. But if you take a snapshot 
*before* delete the file, that file is still there (in the snap), and using 
space (5gb)... ;-)
 Leal
[http://www.posix.brte.com.br/blog]
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