[root@ovirtnodea ~]# sync;fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4M --iodepth=64 --size=4G --readwrite=read --ramp_time=4
test: (g=0): rw=read, bs=4M-4M/4M-4M/4M-4M, ioengine=libaio, iodepth=64
fio-2.2.8
Starting 1 process
Jobs: 1 (f=1): [R(1)] [81.0% done] [251.8MB/0KB/0KB /s] [62/0/0 iops] [eta 00m:04s]
test: (groupid=0, jobs=1): err= 0: pid=31069: Tue Jan 30 22:29:20 2018
  read : io=3364.0MB, bw=270876KB/s, iops=61, runt= 12717msec
  cpu          : usr=0.02%, sys=8.29%, ctx=5480, majf=0, minf=1239
  IO depths    : 1=0.1%, 2=0.3%, 4=0.5%, 8=1.0%, 16=2.1%, 32=4.1%, >=64=123.5%
     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=99.9%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.1%, >=64=0.0%
     issued    : total=r=778/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
     latency   : target=0, window=0, percentile=100.00%, depth=64

Run status group 0 (all jobs):
   READ: io=3364.0MB, aggrb=270876KB/s, minb=270876KB/s, maxb=270876KB/s, mint=12717msec, maxt=12717msec

Disk stats (read/write):
    dm-0: ios=175116/0, merge=0/0, ticks=2392475/0, in_queue=2394941, util=99.50%, aggrios=175424/0, aggrmerge=334/0, aggrticks=2382145/0, aggrin_queue=2382094, aggrutil=99.38%
  sda: ios=175424/0, merge=334/0, ticks=2382145/0, in_queue=2382094, util=99.38%