Dave,

Dude, you've got to get our more. ;)  I'd recommend continually perusing
some of these sites to stay current on what's going on in the industry.
De-dupe is kind of the most-mentioned topic in the storage industry
since I don't know what.  

http://www.searchstorage.com
http://www.byteandswitch.com
http://www.infostoremag.com
http://www.isit.com/IndexSTO.cfm
http://www.backupcentral.com (My blog)

On my blog I've got a series of entries that talks about De-duplication,
starting with this one, "What is De-duplication?"  I tried to link all
the de-dupe entries together, so that each entry has a forwarding link
to the next blog entry in the series:
http://www.backupcentral.com/content/view/58/47/

Your question about where de-dupe resides is answered in this entry "Two
different types of de-dupe:"

http://www.backupcentral.com/content/view/129/47/

We've got directories of both types:
Hardware/Target: http://tinyurl.com/384528
Software/Source: http://tinyurl.com/2dtvh2

(I use TinyUrl.com because the URLs are very long and tend to get
truncated in email.  BTW, tinyurl uses de-duplication-like techniques,
as they run an algorithm against the string to give you a smaller
string.  Then when you click on that string, they "restore" the original
URL to your browser.  Kind of cool.)

---
W. Curtis Preston
Backup Blog @ www.backupcentral.com
VP Data Protection, GlassHouse Technologies 

-----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: Monday, September 24, 2007 11:35 AM
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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