# 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] [181.5M/21118K /s] [11.4K/1289  iops] [eta 00m:00s]
test: (groupid=0, jobs=16): err= 0: pid=8446
  read : io=21312MB, bw=181862KB/s, iops=11366 , runt=120001msec
    clat (usec): min=80 , max=146337 , avg=1369.72, stdev=1026.26
     lat (usec): min=81 , max=146338 , avg=1370.87, stdev=1026.27
    bw (KB/s) : min= 6998, max=13600, per=6.26%, avg=11376.13, stdev=499.42
  write: io=2369.4MB, bw=20218KB/s, iops=1263 , runt=120001msec
    clat (usec): min=67 , max=145760 , avg=268.28, stdev=894.06
     lat (usec): min=67 , max=145761 , avg=269.46, stdev=894.09
    bw (KB/s) : min=  509, max= 2166, per=6.26%, avg=1265.42, stdev=213.82
  cpu          : usr=11.09%, sys=44.83%, ctx=26015341, majf=0, minf=8396
  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=1363980/151635/0, short=0/0/0
     lat (usec): 100=0.11%, 250=5.85%, 500=3.79%, 750=0.32%, 1000=5.51%
     lat (msec): 2=80.06%, 4=1.26%, 10=3.07%, 20=0.01%, 50=0.01%
     lat (msec): 100=0.01%, 250=0.01%

Run status group 0 (all jobs):
   READ: io=21312MB, aggrb=181862KB/s, minb=186227KB/s, maxb=186227KB/s, mint=120001msec, maxt=120001msec
  WRITE: io=2369.4MB, aggrb=20217KB/s, minb=20703KB/s, maxb=20703KB/s, mint=120001msec, maxt=120001msec

Disk stats (read/write):
  sdc: ios=1361926/151423, merge=0/0, ticks=1793432/27812, in_queue=1820240, util=99.99%