When you use NBU client side encryption it removes any repeatable
patterns that the tape drive hardware compression works off. So there is
nothing to compress and so you end up using more tape space.
The only way to get around this issue is to also run with client side
compression since NBU will compress first then encrypt. But it adds even
more delays to the backup time. I would figure a fudge facture of 2-3
times increase in the backup time an average with both options in play. 
Hope this helps. 
Dan O

-----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
apatoliya
Sent: Friday, August 07, 2009 3:24 PM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: [Veritas-bu] NETBACKUP WITH ENCRYPTION OPTION


Thanks for reply 

But why every time when i was enable encryption the tape usage increased
that i know with encryption throughput will degrade somewhat.
Is there something i am missing to configure ???
 even i open a call with symantec they doesn't having information
regarding this issue.

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