And yet there are many companies backing
up well beyond a Terabyte from remote offices back to their central office
using de-duplication. Consider JPMC’s presentation at the last vision.
They’re backing up over 200 remote offices using Puredisk, a
de-duplication backup product. I don’t remember the exact numbers, but
many of them were quite large.
I don’t think that bandwidth is
free, but neither are trucks. AND if you’re going the truck route, make
sure you add the cost and risk of an encryption system to the mix.
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Ed Wilts
Sent: Saturday, September 22, 2007
9:35 AM
To: 'Jeff Lightner';
veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Tapeless
backup environments?
Here’s some
simple math that may help (complements of ExaGrid’s web site).
If you have 1TB of
data with a 2% change rate, you’ll need to back up 20GB of daily
incrementals. To replicate this to another site in 18 hours requires
3Mbps of bandwidth. If you have lots of bandwidth or not too much data,
replication to an offsite location may make sense. But to think that you
can replicate your backups for 20TB of data to another state is going to make
your network group squirm. Iron
Mountain looks pretty
cheap comparing to offsite electronic replication.
We have 1
application by itself that adds 30GB of new data every day. It’s
being replicated within the metro area over a 1Gbps pipe (real time, not via
backups). We sure couldn’t replicate everything…
As the OLD saying
goes, never understand the bandwidth of a station wagon full of tapes.
…/Ed
--
Ed Wilts, RHCE, BCFP,
BCSD
Mounds View, MN,
USA
mailto:ewilts AT ewilts DOT org
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Jeff Lightner
Sent: Friday, September 21, 2007
8:44 AM
To:
veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Tapeless
backup environments?
Yesterday
our director said that he doesn’t intend to ever upgrade existing STK
L700 because eventually we’ll go tapeless as that is what the industry is
doing. The idea being we’d have our disk backup devices here
(e.g. Data Domain) and transfer to offsite storage to another disk device so as
to eliminate the need for ever transporting tapes.
It
made me wonder if anyone was actually doing the above already or was planning
to do so?