I'm not sure this test is valid. The maximum speed will be dictated by the 
channel speed to the VTL. The second factor will be the speed at which the data 
can be offloaded to tape (back store).  The third factor is how quickly ADRDSSU 
can read the data off disk. By trying to read from memory you've eliminated 
this piece entirely. Most shops run backup jobs in parallel to maximize channel 
utilization. Why not backup a half-dozen volumes concurrently and measure the 
results?  

Bob Shannon
Rocket Software

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