dedicated spindles and Oracle

I was talking to an Oracle guy who also works with SANs. This is what he told 
me. For optimal performance do the following

2 redo log groups each with dedicated spindles
2 archive logs each with dedicated spindles

 data data files have their own dedicates spindles with several lines and 
spread the data files out
index data files do the same thing but have their own dedicated spindles

control files can be placed on the same spindles as data files, however, check 
point activity on systems with large numbers of data files especially when 
doing hot backups may require control files having their own dedicated 
spindles. 

What is your opinion? Is there any way to estimate a good starting point to 
test LUN sizes for performance? Not sure what sizes I should ask for to begin 
my performance tests. I was thinking of running bench marks with several 
different sized LUNs. 
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