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?
