# mount | grep /mnt/xfs
/dev/sdc1 on /mnt/xfs type xfs (rw,noatime,nodiratime,nobarrier,logbufs=8)
# fio --filename=/mnt/xfs/test --direct=1 --rw=randrw --bs=16k --size=50G --numjobs=16 --runtime=120 --group_reporting --name=test --rwmixread=90 --thread --ioengine=psync
test: (g=0): rw=randrw, bs=16K-16K/16K-16K, ioengine=psync, iodepth=1
...
test: (g=0): rw=randrw, bs=16K-16K/16K-16K, ioengine=psync, iodepth=1
fio 1.58
Starting 16 threads
test: Laying out IO file(s) (1 file(s) / 51200MB)
Jobs: 16 (f=16): [mmmmmmmmmmmmmmmm] [100.0% done] [58416K/6680K /s] [3565 /407  iops] [eta 00m:00s]
test: (groupid=0, jobs=16): err= 0: pid=26902
  read : io=6507.1MB, bw=55533KB/s, iops=3470 , runt=120004msec
    clat (usec): min=155 , max=356038 , avg=4562.52, stdev=4748.18
     lat (usec): min=156 , max=356038 , avg=4562.69, stdev=4748.19
    bw (KB/s) : min= 1309, max= 4864, per=6.26%, avg=3479.03, stdev=441.47
  write: io=741760KB, bw=6181.2KB/s, iops=386 , runt=120004msec
    clat (usec): min=71 , max=348236 , avg=390.11, stdev=3106.30
     lat (usec): min=71 , max=348236 , avg=390.31, stdev=3106.30
    bw (KB/s) : min=   28, max=  921, per=6.29%, avg=389.02, stdev=114.68
  cpu          : usr=3.43%, sys=11.12%, ctx=21598477, majf=0, minf=7762
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     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=0.0%, >=64=0.0%
     issued r/w/d: total=416508/46360/0, short=0/0/0
     lat (usec): 100=2.65%, 250=0.98%, 500=6.58%, 750=31.88%, 1000=0.27%
     lat (msec): 2=0.08%, 4=0.23%, 10=55.04%, 20=1.76%, 50=0.49%
     lat (msec): 100=0.02%, 250=0.01%, 500=0.01%

Run status group 0 (all jobs):
   READ: io=6507.1MB, aggrb=55532KB/s, minb=56865KB/s, maxb=56865KB/s, mint=120004msec, maxt=120004msec
  WRITE: io=741760KB, aggrb=6181KB/s, minb=6329KB/s, maxb=6329KB/s, mint=120004msec, maxt=120004msec

Disk stats (read/write):
  sdc: ios=416285/46351, merge=0/1, ticks=108136/8768, in_queue=116368, util=93.60%