The standard duplication does it by "image" rather than "tape" so it seems 
unlikely you'd get the same multiplexing on the duplicate as you did on the 
original.   

We don't do multiplexing here because while it speeds up backups it slows down 
restores (and also requires more tapes).   The whole reason for doing backups 
is to be able to restore so your planning around backups should focus on 
restore times as well as backup windows.

Back when we had Ultrium 1 we did tape to tape replication but of course that 
uses more tape drives.    As someone else suggested doing backups to 
deduplication appliances (we use both Data Domain and Quantum DXi) then 
duplicating that to tape is much faster and allows you to free up tape drives 
for duplications and restores.   We've been doing that for more than 3 years 
now.   Also although we don't do it here many of the deduplication appliances 
have a replication feature.   That would eliminate the need for tape because 
you could send your replication to an offsite location over WAN rather than 
having to have a vendor like Iron Mountain or Recall come and pick up your 
tapes (and later return them).


-----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 Bluejay 
Adametz
Sent: Thursday, January 29, 2015 7:38 AM
To: Veritas List
Subject: Re: [Veritas-bu] NetBackup 7.1 - Windows Slow duplication Tape to Tape

> -- How do I check for the -mpx on my bpduplicate? The entire job is run 
> through a GUI interface so I have never seen that option.

I've only done duplications via the command line (we script our duplications), 
However, looking around in the Java GUI, when you get to the "Setup Duplication 
Variables" screen and set the destination of the copy, there's a checkbox near 
the bottom that says "Preserve multiplexing".

                                                         - Bluejay Adametz

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