Soooooooo, is it possible that a software RAID 1 can cut SSD performance in half?
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@matrix Thats not as uncommon as you think. Thats the whole reason multiple runs are done on benchmarks... Keep in mind there is disk level caches, system level caches, as well as other applications you may have running as well (or even system level processes).
@freemo Well it's a fresh server with 32GBs of RAM, so it can abuse that 
@matrix I suspect is the software raid caching data in memory, something linux loves to do when there is a lot of space memory to abuse.