Before we put our T2000's into service as Netbackup master servers, I 
benchmarked their network throughput using ttcp and it was amazing.  We pushed 
5 simultaneous ttcp streams into the T2000 for a cumulative throughput of 495 
MB/sec (that's megabytes).  All of this was without it breaking a sweat on the 
CPU--quite low utilization.  Take careful note that we were using the 6/06 
version of Solaris 10; it takes advantage of the GLDv3 rewrite of the Solaris 
10 networking stack, including network link aggregation.

We put it into service as a Netbackup master server and we aggregated 6 
incoming GigE links.  Like the post above, I used 256K as the buffer size 
(recommended by the the LTO3 drive manufacturer, HP).  I used empirical methods 
to find the miniumal number of buffers that still provided benefit.  I doubled 
the number of buffers, tested, doubled, tested, etc.  I found that 128 buffer 
provide a slight increase in speed vs. 64 buffers.  But beyond 128 there was no 
gain.