Thanks for reminder. Read numbers indeed look fine: slightly here, slightly there, but don't look biased on a quick look. But I would not expect dramatic change on read, since multiple files read in parallel are any way read non-sequentially, requiring some head seek. I was more curios about write time, when during each transaction group 4 different metaslabs has to be written, that may turn more or less sequential process into more random, I guess. Haven't you measured the write time during your tests?
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