5 Go invisible used on startup Disk ??? any suggestion ???

[oemx]

Hello,

I run Os X Server 10.2.3 on a partition of 10 Go,
I've a cloned backup on a firewire drive (exact clone on 10 Go 
partition too; I used the excellent CarbonCopyCloner 2.1.2 to do this).

Since a week or too can't remember exactly I have a message saying 
something like my disk space is full and that I should close 
application and restart. My only choice then is to force restart the 
server ;-(

This is the first strange thing, BUT even more strange is I've only 800 
Mo left on the disk !!!! instead of 6 Go left on the Backup clone 
?????? So I've got more or less 5 invisible Go I just can't find.

There is only the users Home directories and some Applications stored 
on the startup disk
the total amount of users is ± 520 Mo, Apps ± 500 Mo.

I used tinkertool to see all invisible files and I've checked quite all 
folders & files but I can't find those 5Go…
the only difference is I've tuned Journalisation ON on the 'real' 
startup disk wich I did not do on the clone one (Ok so they're not so 
exactly the same : I also installed MacAnalysis and VLC5 but this is 
the only Big difference…).

the server is never shutted down and I only do file sharing (No web 
site, No FTP, No SMB sharing, nothing, only AFP)

I've also noticed a file I don't Have on the backup Clone 
'.D+XserverHD' [serverHD is the partition name] and similar file on my 
partitions or disks.
So is this file due to Journalisation and Could the journalisation be 
responsible for those 5 invisible Go ???
I run Drive10 1.1.4 but it didn't notice Big things. the same with fsck 
-y -f…

As I don't do P2P I can't believe I would have been Hacked for storage 
but Who knows ? and MacAnalysis didn't see any Trojan either…

So before I erase the first disk and clone it back with the Backup I 
have I just wanted to know if anyone Had a clue or so ??? Because I'm 
really in the 4th dimension here !!!

Voilà, I'll call Apple tomorrow just to know if they are aware of such 
a strange thing… but I don't really count on them.
Thanks
Olive oemx