The OST plugin will help you with the offsite copy to your duplicate DD 
appliance because the use of optimized duplication, available when using OST 
and NBU, reduces the bandwidth used to duplicate images, speeding up the 
duplication process.  

Using an SLP (Storage Lifecycle Process) to manage your duplications should 
allow you to specify a backup destination (in your case your local DD 
appliance) followed by two duplication targets (one being your 2nd dd appliance 
and one being a local tape drive).

We've never used the VTL option so I'm not sure if you need to have this 
configured in order to be able to duplicate to tape from a DD appliance.

Mark Glazerman
Desk: 314-889-8282
Cell: 618-520-3401
 please don't print this e-mail unless you really need to


-----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 sandesh
Sent: Thursday, April 14, 2011 9:38 AM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: [Veritas-bu] EMC Data Domain OST Vs VTL with NetBackup

We are in the early stages of implementing EMC Data Domain dedupe appliance and 
use Symantec NetBackup. I've a couple of questions about it for the experts. 

Plan is to have a DD appliance in 1 location and replicate data to another DD 
appliance in another location. Plan is also to generate a tape copy for long 
term archival at primary location. 

1.OST & VTL are both being discussed. Which option is most favorable in the 
industry? Are there any specific advantages that can make or break things?
2.VTL supports LTO3 drives at the most. Does this mean that we need to have 
LTO3 physical tape drives for duplicate copy or will LTO5 drives work?

Thanks in advance.

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