There is no easy answer to your question. It all depends upon your hardware and your goals. I'd advise you to contract someone with experience doing this type of thing.
I see, you were looking for a "general" what to do, not a specific where do I put this.
If your looking to tune your system for Optimal I/O I'd recommend researching some of the oracle docs. It just depends on what your application type is and what your trying to achieve. There is no simple answer or a 1 size fits all answer for this question.
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