How many drives are you using when you are running TDP for R/3 and backing up SAP Database? Urgent!

[Juan Jose Reale]

  Hi everybody!  

        We are going to purchase a LTO Ultrium Ultrascalable tape library 3584 model 
L32,  but  I don't know  yet how many drives we need for running TDP for R/3 (Oracle) 
on IBM 6M1 RS/600 in under 4 hours.   
        There are 8 CPU's (750 Mhz) with memoria real = 10 GB.  The SAP database's 
size is about 1.700 GB  or  1,7 TB.   The TSM Server 4.2.2.10 are running on IBM MB80 
RS/600. The TSM server is on the separate physical server from SAP database.   
        We are using disks SHARK IBM. 
        
        So, please tell me how many drives recommend to allocate in Library 3584 in 
order to take a SAP database backup in under 4 hours.  

        Thanks in advanced.  
        Juan R.  

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