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  • Writer's picturekyle Hailey

IO operations per second




Vendors say that read cache will take care of IO Operations per sec, but if you have a sustained throughput it will only sustain for so long

Here is an example from James Morle http://scaleability.com :



Seagate Barracuda 4LP

Seagate Cheetah 73LP

Capacity

2.16GB

73.4GB

Rotation Speed

7200rpm

10000rpm

Rotational Delay(avg)

4.1ms

3ms

Time to read 32Kb

6ms

3ms

Seek Time (avg)

9.4ms

4.9

Total time for Single I/O

19.5ms

10.9ms

I/O per second (conservative)

51

92

IOPs/sec per 100GB

2550

126


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