My understanding is that the "file system" is completely virtual.  The file 
list you can pull as a CIFS or NFS share, but each file is made up of "chunks" 
on the back end.  I think by definition deduplication involves LOTS of 
fragments. :)

I questioned the performance myself - I haven't test driven a box yet so I 
really can't speak to it.

Anyone else?

-Jonathan 

-----Original Message-----
From: Paul Keating [mailto:pkeating AT bank-banque-canada DOT ca] 
Sent: Monday, September 24, 2007 1:38 PM
To: Martin, Jonathan; VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Script to label expired tapes in a VTL

What filesystem is on the appliance?
Does the app then "defrag" the small chunks of dereferenced space into 
contiguous chunks?
Or does the next backup write to whatever chunks of free space it can find 
(performance?)

-- 


> -----Original Message-----
> From: Martin, Jonathan [mailto:JMARTI05 AT intersil DOT com]
> Sent: September 24, 2007 1:35 PM
> To: Paul Keating; VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Script to label expired tapes in a VTL
> 
> 
> Per my Data Domain rep - when a DSU image expires, NBU deletes it.  
> Data Domain's product then checks all the blocks associated with that 
> image file and removes any that are not shared by any other backups.
> 
> -Jonathan
====================================================================================

La version française suit le texte anglais.

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