alter to go to diskpool first
use tsm client compression
don't multiplex with tdp
run about 10-20 concurrent client sessions (based on processor ability)
you should see about 4/1 compression
you should see about 11.6 MB/sec data transfer (if things are really OK &
processor can keep up)
you should see your db backup in just over 2 hours...

we have a 2.4 TB data base, use the above methods and push 600 GB (the
compressed size) in 16 hours...
we also have smaller ones we see the same rates with... such as a 200 GB
that compresses down to about 60 GB and runs in  under 2 hours

hope this helps...
Dwight