Anyway, there are still some strange things happening when effective_io_concurrency is non-zero.
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Vitaliy
I was researching whether I could optimize a concatenated lvm2 volume when I have disks of different speeds (concatenated - not striped - and I think I can if I concatenate them in the right order - still testing on that front), when I came across this article from a few years ago:
Which brought me back to this discussion about effective_io_concurrency from a couple of weeks ago. I noticed that the recent round of tests being discussed never mentioned the file system used. Was it XFS? Does changing the agcount change the behaviour?