What is the best kind of IO? The one you do not have to do

If no IO (input/output) operation is the best IO, than the second best IO is the one that can be done as close to the application and processor with best locality of reference. Then the third best IO is the one that can be done in less time, or at least cost or impact to the requesting application which means moving further down the memory and storage stack.

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http://storageioblog.com/?p=3026

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