I'm not convinced that writing to a DataDomain is going to be faster than
writing to multiple LTO-3 drives over a SAN.  The DD is limited to about
90MB/sec which is on par with 1-2 LTO-3 drives and not much more than that.
Unless, of course, you consider adding extra DD units for every 2 LTO-3
drives you currently have and that's going to bump your costs up even higher
(which might be offset by the requirement for a Decru FC520 encrypting
appliance for every 2-3 LTO-3 drives today).

I don't think that NetBackup 6.5 includes de-duplication.  It's provided by
PureDisk which is a separately licensed product.  With 6.5.1, you'll be able
to use PureDisk as a storage unit, something that's not there yet today.

        .../Ed

--
Ed Wilts, RHCE, BCFP, BCSD
Mounds View, MN, USA
mailto:ewilts AT ewilts DOT org


> -----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 Clem Kruger
> Sent: Monday, September 24, 2007 11:32 AM
> To: dave.markham AT fjserv DOT net; Jeff Lightner
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Tapeless backup environments?
> 
> Hi Dave,
> 
> Yes it is a difficult decision I have looked at DataDomain with
> NetBackup. I have found that the backups are faster and there is a vast
> amount of disk being saved.
> 
> NetBackup 6.5 includes de-duplication and I have become a great friend
> of it. To use the words of a supplier, "Saving me Time, Saving me Space
> and Saving me Money" :)
> 
> 
> Kind Regards,
> Clem Kruger
> 
> -----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 Dave
> Markham
> Sent: 24 September 2007 17:35 PM
> To: Jeff Lightner
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Tapeless backup environments?
> 
> Guys i've just read this thread and can say im very interested in it.
> The first thing is i learned a new term called deduplication which i
> didn't know existed.
> 
> Question : I gather Deduplication is using other software. DataDomain i
> think i saw mentioned. Where does this fit in with Netbackup and does
> the software reside on every client or just a server somewhere?
> 
> Ok, so im trying to kit refresh a backup environment for a customer
> which has 2 sites. Production and DR about 200 miles apart. There is a
> link between the sites but the customer will probably frown on
> increased
> bandwidth charges to transfer backup data across for DisasterRecovery
> purposes.
> 
> Data is probably only 1 TB for the site with perhaps 70% being required
> to be transfered daily to offsite media.
> 
> Currently i use tape and i was just speccing a new tape system as i
> thought by using disk based backups, and retentions of weekly/monthly
> backups lasting say 6 weeks, im going to need a LOT of disk, plus the
> bandwidth transfer costs to DR site
> 
> LTO3 tapes are storing 200gb a tape which is pretty good compared to
> disk i thought.
> 
> I guess in my set up its a trade off between :-
> 
> Initial cost of disk array vs initial cost of tape library, drives and
> media
> 
> Time take to backup ( network will be bottle neck here. Still on 100Meg
> lan with just 2 DB servers using GigaBit lan to backup server.
> 
> Offsite transfer of tapes daily to offsite location vs Cost of
> increased
> bandwith between sites to transfer backup data.
> 
> 
> Im now confused what to propose :)

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