> More holding space is going to give you the biggest boost.  

And be sure to have fast holding disks.  LTO drives eat data at
20-30MB/s if your disk can send it that fast; in my setup (currently
400GB/night, and struggling to finish in 24h!), I've only two IDE
holding disks, and the combined accesses of a few dumpers and the taper
makes my writing speed drop to around 4MB/s.

Alex

-- 
Alexander Jolk         /         BUF Compagnie
tel +33-1 42 68 18 28 /  fax +33-1 42 68 18 29