The restriction we found when we looked into this in 2008 was that the DD only 
supported one 'LSU'.  That meant that a single DD appliance could only be used 
by a single NetBackup domain.  We wanted to have few appliances and many 
domains, which PureDisk (and now the Symantec NetBackup 5000) can do.

I know that the number of LSUs supported has gone up, but I believe that there 
is still more of a concept of the DD 'belonging' to a domain than with 
PureDisk.  Your EMC SE will be able to correct anything I say that is now wrong!

I have to admit that we've adopted neither and still backup to LTO tape.  That 
was more because of the difficulty in creating a cost saving to pay for the 
hardware than any technical deficiency of either.

Another factor I think is that with OST the NetBackup domain knows about the 
duplicates.  With VTL I believe, and certainly if using the DD as a NAS 
BasicDisk and letting it manage its own replication, NetBackup has no idea that 
the replicas exist.  I'd suggest you check but it may be that if you duplicate 
a VTC you get 2 with the same 'barcode'.

I would advise using OST.  I also think DD have invested a lot more effort in 
the non-VTL features over the past few years.

William D L Brown
Ext Tel: +44 1438 766162 Fax +44 1438 312767


-----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: 14 April 2011 15:38
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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