Comment by menaerus

> fio --filename=device name --direct=1 --rw=randread --bs=4k --ioengine=libaio --iodepth=256 --runtime=120 --numjobs=4 --time_based --group_reporting --name=iops-test-job --eta-newline=1 --readonly

> -> read: IOPS=19.1k, BW=149MiB/s (156MB/s)(4473MiB/30001msec)

Isn't this too low? On my non-RAID configuration I get almost 2GB/s with the exact same command. Samsung 980 PRO 1TB.