On a similar note how does NDMP play with Disk de-dup? All of the de-dups
I've seem are NAS devices. NDMP only talks to tape or VTL. Are there VTL's
with De-dup that would solve the NDMP problem?

Jim

-----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 8:35 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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