Some VTL products' de-duplication technology is eons beyond compression,
with low level pattern matching, etc, etc, enabling upt to 25:1
effective "compression".
 
VTL allows you to pool disk on a single VTL that can be shared to
multiple media servers as virtual tape drives, whereas DSSU cannot be
shared, so you must pre determine how many jobs per storage unit/media
server you will run in a given night, and allocate the appropriate
amount of disk per media server.
 
if you have an operations group that is accustomed to tape, it maintains
the tape paradigm they're familiar with.
 
VTLs can be clustered, so you can have a second VTL at a second site,
replicated over IP, without getting into duplication, vaulting, or any
sort of DR copy within the backup app.
 
other stuff, but I'm outta here for the day, and that's all that on the
top of my mind at the moment.
:o)
 
Paul
 
 
-- 

        -----Original Message-----
        From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of
briandiven at northwesternmutual.com
        Sent: August 1, 2006 3:30 PM
        To: HallC at sec.gov; veritas-bu at mailman.eng.auburn.edu
        Subject: Re: [Veritas-bu] Anyone using VTL
        
        
        I guess this begs the question to the audience and the people
that have put in VTL's ... what problems does a VTL solve that D2D can
not?  
         
        I think the list so far is:
         
        1.  Administration is easier
        2.  Possibly performance
        3.  Compression (1/2 the disk of D2D)
        4.  I can use it to stress test a new NBU release
         
        Anything else?

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