Theres a technote that describes how to do the
/dev/null trick on Veritas website.

However, the problem is that the measure would
not allow for tape drive compression which would be critical
to determine utilisation if the data is very compressible.

Regards
Peter Marelas

-----Original Message-----
From: Rob Worman [mailto:rworman AT yahoo DOT com]
Sent: Thursday, September 06, 2001 1:10 AM
To: Joseph P Frazee
Cc: Vertias-BU
Subject: Re: [Veritas-bu] Simulation


As far as having NBU "do the reads, but not the writes", I have heard 
rumors of a file that can be created that will put NBU into a 
"non-writing" mode, i.e. all backups are written to /dev/null instead of 
disk or tape.  But I don't know the details of that. I have done this 
manually by calling bpbkar by hand on the NBU client:

   root # /usr/openv/netbackup/bin/bpbkar -dt 0 -r 888 -nocont /var > 
/dev/null

But you mention seeing the "tapes that would have been used" - I don't 
know of a way to trick NetBackup into selecting a tape without NBU 
attempting to write to that tape.  (you could just write protect the 
tape, but then your simulation backup would fail...)

HTH
rob


Joseph P Frazee wrote:

>Are there any tools available or means to run a backup simulation with
>NetBackup?
>
>I guess what I am in search of is something that would go trough, do the
>reads, not the writes, and keep track of the tapes that would have been
>used along the way.
>
>Does this exist?
>
>Thanks,
>
>
>Joseph P Frazee
>frazee.23 AT osu DOT edu
>
>
>
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>Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
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>



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