I think what may be happening is that a single X25 has more than enough IOPS for the programs that One_Hertz is using. Whereas your Titan and Raptors are not capable of completely satisfying the programs you were using, thus when you added a drive it improved because your IOPS improved slightly. I do not believe that IOPS improve as well as Throughput on RAID0 configs though. Well, that's my theory at least.
X25- capable of more than enough IOPS by itself
Other MLCs - capable, but can't provide enough IOPS on its own.
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