$ sudo fio --bs=4k --ioengine=libaio --iodepth=32 --size=10g --direct=1 --runtime=60 --filename=/dev/sdc1 --rw=randread --numjobs=1 --name=test test: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1): [r(1)][100.0%][r=1896KiB/s][r=474 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=3443: Sat Jan 9 15:32:51 2021 read: IOPS=464, BW=1858KiB/s (1903kB/s)(109MiB/60099msec) [ ... ] Run status group 0 (all jobs): READ: bw=1858KiB/s (1903kB/s), 1858KiB/s-1858KiB/s (1903kB/s-1903kB/s), io=109MiB (114MB), run=60099-60099msec Disk stats (read/write): sdc1: ios=27838/0, merge=0/0, ticks=1912861/0, in_queue=1856892, util=98.07%