If your tape storage is fast enough (you didn't mention what you have)
you'd probably want to go straight to tape with the database backups.  You
didn't describe the client at all, but if you're using a TDP agent, the
file sizes coming in would be fairly large, and you could set a Maximum
File Size for your DASD pool that would be smaller than the backup data
files coming in, and would force them to go straight to tape.

Nick Cassimatis
nickpc AT us.ibm DOT com