I'm not sure if this will be any help, but...
I can only think of 2 things.  Have you tried putting a sniffer behind one
of the nt boxes or tried hardcoding the network settings to use full duplex
100mb?

Also, are the Nt servers using raid arrays to stripe data.  I've noticed
that during a fresh rebuild, there are some nt boxes with older raid arrays
here that take quite considerably a bit longer to restore when trying to
rebuild and write parity information.  

Robert Chae 
Enterprise Storage Administrator
Compuware Corporation
31440Northwestern Highway 
Farmington Hills, Mi 48334-2564 
ext: (248) 737-7300 x18409 
fax: (248) 737-7368 

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Message: 5
From: "Price, Michael" <MPrice AT dantis DOT com>
To: Veritas-bu AT mailman.eng.auburn DOT edu
Date: Mon, 2 Apr 2001 09:08:29 -0500 
Subject: [Veritas-bu] Extreme NT/W2K Slowness!

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        Does anyone have any idea why our NT clients backup and restore at
1/10th the speed of our UNIX servers?  Everything is 100 full duplex, same
networks, same interfaces on the media servers.  The backup speeds for UNIX
clients are about a gig every 2 minutes, while it takes about 20 minutes to
do a gig on NT.

        Thanks in advance!