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Re: [Veritas-bu] Tapeless backup environments?
2007-09-24 11:27:55
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I
currently backup 9TB of data to VTL during a FULL window which writes ~100GB of
data to the VTL repository in that window.
Another state is one thing, but across town via DWDM is no
prob.
out of
state is handled by duping that data to phys tape....wouldn't want to dupe disk
outside of a DWDM connection.
Paul
--
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 ====================================================================================
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