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IOPS Calculation for HDD
Given Information on HDD
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Rotational speed: 10,000 RPM
Average latency: 3 ms (0.003 seconds)
Average seek time: 4.2 (r)/4.7 (w) = 4.45 ms (0.0045 seconds)
Then IOPS would be
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Calculated IOPS for this disk: 1/(0.003 + 0.0045) = about 133 IOPS
If RPM (10000) and Avg. seek time (4.45 ms) are given
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Formula for Avg. Latency (in ms) =(1/(10000/60))*0.5*1000