You could also just remove all the other tapes from the library until your
testing is done.

-- M



                                                                           
             "David Chapa"                                                 
             <david.chapa@adic                                             
             .com>                                                      To 
             Sent by:                  "Ellwood, MW \(Mike\)"              
             veritas-bu-admin@         <M.W.Ellwood AT rl.ac DOT uk>,           
  
             mailman.eng.aubur         <veritas-bu AT eng.auburn DOT edu>q      
  
             n.edu                                                      cc 
                                                                           
                                                                   Subject 
             05/25/2005 10:07          RE: [Veritas-bu] trying to force    
             AM                        tape on specific drive in a robotic 
                                       environment (Sun L20 - 2 x LTO-1).  
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




tpreq is used to do manually mount tapes up in drives.  Unless the
drives are standalone, you don't have much of a choice as to which drive
it enters, unless you DOWN all but the one you want the media mounted
in.

What specifically are you trying to re-produce on the specific drive?

NBU selection process is round robin fashion I believe from a very
simplistic point of view.

Are you looking to diagnose reads or writes with this drive in question?

David A. Chapa | ADIC | 720.272.8452 cell | http://www.adic.com
Senior Technologist
Pathlight VX - http://www.adic.com/gopathlightvx




-----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 Ellwood,
MW (Mike)
Sent: Wednesday, May 25, 2005 7:54 AM
To: veritas-bu AT eng.auburn DOT edu
Subject: [Veritas-bu] trying to force tape on specific drive in a
robotic environment (Sun L20 - 2 x LTO-1).

> We have a Sun-branded L20 robot with 2 LTO-1 drives.
>
> I would like to force tapes on to a specific drives for diagnostic
purposes (trying to reproduce a tape error).
>
> This is actually in bpduplicate, so it's not simply a matter of
DOWNing one of the drives.
>
> I have tried physically pre-mounting the tapes, but Netbackup
perversely unloads them and remounts them
> according to its own will or whim (the opposite way round in this
case).
>
> I tried mounting the tapes with tpreq, but that doesn't seem to work.
> (It seems to keep them reserved, so bpduplicate (or anything else)
can't use them until unmounted with tpunmount).
>
> (Anyone know what tpreq is actually intended for?)
>
>
> What algorithm (if any) does Netbackup use for choosing a drive for a
specific mount?
>
> Is this configurable?  (this rang a vague bell), but I couldn't find
anything useful looking in bp.conf documentation
> (or would it be vm.conf...?).
>
> I am running (don't laugh) 3.4, on Solaris 5.8 .
>
>
> With thanks,
>
> Mike E.

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