Here is a little information that I had sent to someone else.  As far as the
AS400 to TSM backups, I feel that it works if you can through the hardware
(from the AS/400 side) at it.

"Attached is timings from last night.  This will give you an idea of how
long transfer times are.  All of the timings in the list are backups through
BRMS directly to TSM and the times are from TSM.  There usually is a couple
of minutes on the AS400 side before the data transfer is started.  No matter
how you group the libraries in the BRMS groups, every library is considered
a separate object to TSM (that is why your see so many).  These timings
represent 186GB of data.  The last entry is a backup that we run that totals
71GB but because it requires the users to be down, we backup to a save file
and then let BRMS transfer that save file.

Our config is close.  The AS400 is an 830 with GB network card and the TSM
server is a dual processor Win2000 machine (cluster but running
Active/Passive) with 2GB of memory and GB network card.  All backups go
directly to diskpool and move to tapepool later in the morning."