How to measure disk performance?

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    Scientifically and objectively? Which certificates are there which focus on storage?

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    I usually measure it by sequential read speed, random read speed and long tail read speed(simulating for web scenario ).

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    Input/Output traffic are of 4 different types, sequential read, sequential write, random read and random writes. These are measured in terms of number of IOPs per second and that varies based on the system capacity and Queue Depth for accepting the commands.

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