ok i ran the 4k on single drive. the results are going to be shocking!!
the latency is higher on the single ssd with increasing Queue Depth because the single SSD simply cannot deliver as fast as eight. the single ssd wins at QD of 1, by .01 of a second and a slight win in mb/s. after that it is no contest. the right side is raid 0 eight vertex. the left hand side is single ssd.
NOW if you take into the fact that the queue depth on a single ssd is going to raise much more quickly, and that the successive access time of EACH queue depth on the ssd is going to get higher than on the array, the array is way way faster. the fact that the ssd has higher access time with qd, and also higher qd also, it is like a multiplier. that is why the raids far far exceed speeds of single ssd.
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