I don't see it in documentation, but it's there when I do 
bpduplicate --help and it works nicely.
I'm on NBU 3.4

-charlie

-----Original Message-----
From: Donaldson, Mark [mailto:Mark.Donaldson AT experianems DOT com]
Sent: Wednesday, August 28, 2002 12:09 PM
To: 'Ballowe, Charles'; 'Eric Forgette'
Cc: 'veritas-bu AT mailman.eng.auburn DOT edu'
Subject: RE: [Veritas-bu] tape drive performance on image copies


-altreadhost? 
is this a bpduplicate option?  I don't see it in my v3.4, is it 4.5? 
-M 
-----Original Message----- 
From: Ballowe, Charles [mailto:CBallowe AT usg DOT com] 
Sent: Wednesday, August 28, 2002 10:11 AM 
To: 'Eric Forgette' 
Cc: 'veritas-bu AT mailman.eng.auburn DOT edu' 
Subject: RE: [Veritas-bu] tape drive performance on image copies 


are you using a read host that is the same as your write host, things 
go much faster with -altreadhost rather than reading on one drive, 
sending data over the network, and writing on a different host. 
just a thought 
> -----Original Message----- 
> From: Eric Forgette [mailto:epforgette AT overnite DOT com] 
> Sent: Wednesday, August 28, 2002 10:15 AM 
> To: veritas-bu AT mailman.eng.auburn DOT edu 
> Subject: [Veritas-bu] tape drive performance on image copies 
> 
> 
> I wrote a perl script to duplicate the most recent, successful, full 
> backup images for a particular class.  The script is available at 
> http://perlvault.sourceforge.net/ (beta release still...) 
> 
> The problem I am having is in the performance of the image copies.  My 
> expectation was that the tape to tape copies would be faster than the 
> backups themselves.  The regular backup performance is limited by the 
> fact that there are tons of small files and by the network speed / cpu 
> speed of the client.  My understanding is that the images 
> (once on tape) 
> are one sequential file, which should lend itself well to copying. 
> 
> The master is an E4500 running Solaris 5.8.  I am using LTO 
> drives which 
> are SAN attached.  I've seen throughput (using iostat) of 11 MB/second 
> during regular backups.  During the image copies, I get between 5 - 7 
> MB/second.  The regular backups do not use any multiplexing. 
> 
> Is there any tuning parameters I can tweak?  
> Anyone have any ideas? 
> 
> Regards, 
> -Eric 
> -- 
> Eric Forgette 
> Unix Systems Administrator 
> _______________________________________________ 
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu 
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu 
> 
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