I don't know what I'm doing.

https://arstech.net/how-to-measure-disk-performance-iops-with-fio-in-linux/

    fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75

====== ioDrive2 ======
<code>
    test: Laying out IO file (1 file / 4096MiB)
Jobs: 1 (f=1): [m(1)][100.0%][r=222MiB/s,w=73.3MiB/s][r=56.8k,w=18.8k IOPS][eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=16770: Wed Sep  4 10:20:39 2019
   read: IOPS=56.7k, BW=221MiB/s (232MB/s)(3070MiB/13868msec)
   bw (  KiB/s): min=196880, max=232944, per=99.91%, avg=226479.11, stdev=6574.92, samples=27
   iops        : min=49220, max=58236, avg=56619.78, stdev=1643.73, samples=27
  write: IOPS=18.9k, BW=73.0MiB/s (77.6MB/s)(1026MiB/13868msec)
   bw (  KiB/s): min=65536, max=78168, per=99.94%, avg=75711.70, stdev=2337.16, samples=27
   iops        : min=16384, max=19542, avg=18927.93, stdev=584.29, samples=27
  cpu          : usr=15.03%, sys=52.34%, ctx=451474, majf=0, minf=22
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0%
     issued rwt: total=785920,262656,0, short=0,0,0, dropped=0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=64

Run status group 0 (all jobs):
   READ: bw=221MiB/s (232MB/s), 221MiB/s-221MiB/s (232MB/s-232MB/s), io=3070MiB (3219MB), run=13868-13868msec
  WRITE: bw=73.0MiB/s (77.6MB/s), 73.0MiB/s-73.0MiB/s (77.6MB/s-77.6MB/s), io=1026MiB (1076MB), run=13868-13868msec

Disk stats (read/write):
  fioa: ios=774488/258871, merge=0/0, ticks=344456/23701, in_queue=18717, util=56.08%
</code>

====== ioScale2 ======
<code>
test: Laying out IO file (1 file / 4096MiB)
Jobs: 1 (f=1): [m(1)][100.0%][r=204MiB/s,w=67.3MiB/s][r=52.2k,w=17.2k IOPS][eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=9572: Wed Sep  4 10:45:00 2019
   read: IOPS=51.9k, BW=203MiB/s (213MB/s)(3070MiB/15141msec)
   bw (  KiB/s): min=185616, max=215648, per=100.00%, avg=207700.90, stdev=6024.06, samples=30
   iops        : min=46404, max=53912, avg=51925.20, stdev=1506.00, samples=30
  write: IOPS=17.3k, BW=67.8MiB/s (71.1MB/s)(1026MiB/15141msec)
   bw (  KiB/s): min=62048, max=71976, per=100.00%, avg=69405.47, stdev=1991.82, samples=30
   iops        : min=15512, max=17994, avg=17351.37, stdev=497.96, samples=30
  cpu          : usr=14.75%, sys=49.09%, ctx=428129, majf=0, minf=22
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0%
     issued rwt: total=785920,262656,0, short=0,0,0, dropped=0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=64

Run status group 0 (all jobs):
   READ: bw=203MiB/s (213MB/s), 203MiB/s-203MiB/s (213MB/s-213MB/s), io=3070MiB (3219MB), run=15141-15141msec
  WRITE: bw=67.8MiB/s (71.1MB/s), 67.8MiB/s-67.8MiB/s (71.1MB/s-71.1MB/s), io=1026MiB (1076MB), run=15141-15141msec

Disk stats (read/write):
  fioa: ios=773851/258672, merge=0/0, ticks=452661/32417, in_queue=42526, util=61.84%
</code>