AS/400 size guess

I have a 720 with processor 2063 feature1504  with 2GB memory.

I am looking to get a fail over machine, I want to get the smallest machine 
that will handle the normal workload of just my mission critical application.

My CPU averages at only about 15% to maybe 20% and basically almost no 
pageing, when I have just this application running.

I am looking for a machine that could handle this for a realatively short 
period of time, say 12 to 24 hours. It could be running at 90 - 100% CPU.
It would need to have the ability to have about 350 interactive devices 
attached, and would need basically no batch processing during the fail over.


Does anyone have a guess at what size of a machine that this would take to 
run on?


Any suggestions would be greatly appreciated.


Chris

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