Simple - time to perform the backup might still be shorter.

A couple years ago I did a Data Domain install at a customer that was using SQL 
LiteSpeed for their SQL servers.
SQL LiteSpeed was compressing the data before sending it over the wire.

Even though they got better dedup numbers with compression disabled, the time 
involved in sending the uncompressed data over the wire to the Data Domain was 
much longer than when they compressed it.
If I remember correctly, it was on the order of 3-4x faster to do the backup 
with the LiteSpeed compression enabled.

Data Domain doesn't provide the option of a share/export that bypasses the 
deduplication engine - if it did we would have used that.
As it was, they had enough capacity in their Data Domain to handle a portion of 
data that did not deduplicate as well as theoretically possible.

If you've got 10GbE everywhere, then this argument goes out the window.
But I wanted to show that there are times when sending compressed data to a 
Data Domain makes sense.

-daniel



-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of 
Lightner, Jeff
Sent: Thursday, August 18, 2011 1:14 PM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: Re: [Veritas-bu] Data Domain Question

Compressing compressed data sometimes has the effect of actually INCREASING the 
space utilized.   Luckily deduplication is preventing this for you but really, 
why spend processing time on the server to compress data that is going to be 
compressed on the appliance?





-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of rsavage
Sent: Thursday, August 18, 2011 2:05 PM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: [Veritas-bu] Data Domain Question

Currently our SQL team run SQL LiteSpeed with compresson. They really dont want 
to turn it off.

We keep 5 weeks of data for our SQL backups and are getting 2.1 to 3.5 dedupe 
ratio's even with compression backup on.

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