Our understanding is that the initial image goes to cache (ssd) then is
compressed to permanent storage (RAID6).   Subsequent backups are block
deduped from that original compressed copy.    This is similar to the
way it worked with Data Domain except they do it inline on the fly.
That is to say it seems you're thinking that DXi always has a full size
copy of your original image but I don't believe that to be the case any
more than it is with Data Domain.

 

________________________________

From: veritas-bu-boun...@mailman.eng.auburn.edu
[mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of Robin
Small
Sent: Monday, February 14, 2011 11:06 AM
To: veritas-bu@mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Quantum's DXi Series of Dedupe Appliances

 

On the Quantum,

 

When we were looking at it a while back, I understood that for each
client you threw at it, it would store a non-deduped initial "base"
image of that client and dedupe around it, as opposed to deduping
everything including base images and incrementals.

 

Is that still the case?

 

~ Robin

 

From: veritas-bu-boun...@mailman.eng.auburn.edu
[mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of
Lightner, Jeff
Sent: Monday, February 14, 2011 6:03 AM
To: veritas-bu@mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Quantum's DXi Series of Dedupe Appliances

 

We have run the DD460 and DD690 (and continue to run the latter).   Back
in November we got the DXi 6500 to replace our two DD460s.

 

Performance wise I really like the Data Domain products - they do the
compression they promise.   So far I've seen nothing with the DXi 6500
that leads me to believe it isn't just as good.   We use it for our main
Production (4 TB) DB and other large backups.   The PROD backup is
finishing in a window shorter than it did on the DD690.   We went to the
Quantum stuff as part of a big data center move that gave us better
pricing for the DXi than we would have gotten on a DD not for any
technical issues with the DD itself.
 
Proud partner. Susan G. Komen for the Cure.
 
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