The limit of 1tb is actually not correct anymore.  It's not an NDMP
stream limit either.  We were worried about this as well but our
operations have confirmed the limit is 2tb *on a single tape*, not a
stream.  Something to do with how much it can track in a single
location, or something like that.

In any case, Veritas says unless you have a tapes that can hold 2tb or
greater there is no limit.
We're increasing our volume sizes based on this so we'll see...

~JK

-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Sto
Rage(c) 
Sent: Thursday, May 12, 2005 6:56 PM
To: Piszcz, Justin
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Best way to backup 3TB of data daily?

<*please don't flame me for bringing up a non Veritas solution*>We were
in the same situation last year. We took a different approachthough.
This year we began deploying NetApp's Open System Snapvault(OSSV) on
these servers and started backing them onto NetApp'sNearline filers
R200. After the inital full backup, its justincremental forever over the
network, but each backup is a full backupon the  R200 because it uses
snapshots. Has been working great so far. We are able to retain upto 6
to 8 weeks of backups on disks. For someof the critical systems we have
increased the backup frequency to 4 to8 hour intervals.  Our SLAs have
improved dramatically. We havescripts that allows doing Oracle hot
backups too.We now only do monthly offsite via NDMP using Netbackup now.
No morenightly tapes!Now if Veritas can fix their limitation of having
to keep the NDMPimage size to less than a TB. it would make our life
much morehappier.-GPS: I am just a statisfied customer and not
affiliated !
to any vendormentioned here.
On 5/11/05, Piszcz, Justin <jpiszcz AT servervault DOT com> wrote:>  >  > >
All, > >   > > I was curious if anyone here is backing up large amounts
of data, such as> large databases and fileservers that are 3TB or
bigger. > > What is the best way to accomplish such backups? > >   > >
Here is one 'idea' - please let me know if there are other, better ways:
> >   > > If one can sustain 100 megabytes per second over a gigabit
link writing to> multiple (5) LTO2 tape drives, each doing 20MB/s then
it would still take> around 8 hours to backup this information,
essentially you would need a> complete backup solution JUST for this 3TB
array. > >   > > What are some good methods when backing up such large
data sets? > >   > > Thanks! > >
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