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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